[FFmpeg-devel] [PATCH v14] avformat/dashdec: add dash demuxer base version

Rodger Combs rodger.combs at gmail.com
Wed Apr 12 09:13:55 EEST 2017


> On Apr 9, 2017, at 09:08, Steven Liu <lq at chinaffmpeg.org> wrote:
> 
> ffmpeg need a dash demuxer for demux the dash formats
> base on
> https://github.com/samsamsam-iptvplayer/exteplayer3/blob/master/tmp/ffmpeg/patches/3.2.2/000001_add_dash_demux.patch
> 
> TODO:
> 1. support multi bitrate dash
> 
> v2 fixed:
> 1. from autodetect to disabled
> 2. from camelCase code style to ffmpeg code style
> 3. from RepType to AVMediaType
> 4. fix variable typo
> 5. change time value from uint32_t to uint64_t
> 6. removed be used once API
> 7. change 'time(NULL)`, except it is not 2038-safe.' to av_gettime and av_timegm
> 8. merge complex free operation to free_fragment
> 9. use API from snprintf to av_asprintf
> 
> v3 fixed:
> 1. fix typo from --enabled-xml2 to --enable-xml2
> 
> v4 fixed:
> 1. from --enable-xml2 to --enable-libxml2
> 2. move system includes to top
> 3. remove nouse includes
> 4. rename enum name
> 5. add a trailing comma for the last entry enum
> 6. fix comment typo
> 7. add const to DASHContext class front
> 8. check sscanf if return arguments and give warning message when error
> 9. check validity before free seg->url and seg
> 10. check if the val is null, before use atoll
> 
> v5 fixed:
> 1. fix typo from mainifest to manifest
> 
> v6 fixed:
> 1. from realloc to av_realloc
> 2. from free to av_free
> 
> v7 fixed:
> 1. remove the -lxml2 from configure when require_pkg_config
> 
> v8 fixed:
> 1. fix replace filename template by av_asprintf secure problem
> 
> v9 modified:
> 1. make manifest parser clearly
> 
> v10 fixed:
> 1. fix function API name code style
> 2. remove redundant strreplace call
> 3. remove redundant memory operation and check return value from get_content_url()
> 4. add space between ) and {
> 5. remove no need to log the value for print
> 
> v11 fixed:
> 1. from atoll to strtoll
> 
> v12 fixed:
> 1. remove strreplace and instead by av_strreplace
> 
> v13 fixed:
> 1. fix bug: cannot play:
> http://dash.edgesuite.net/akamai/bbb_30fps/bbb_30fps.mpd
> 
> v14 fixed:
> 1. fix bug: TLS connection was non-properly terminated
> 2. fix bug: No trailing CRLF found in HTTP header
> 
> Reviewed-by: Clément Bœsch <u at pkh.me>
> Reviewed-by: Michael Niedermayer <michael at niedermayer.cc>
> Reviewed-by: Carl Eugen Hoyos <cehoyos at ag.or.at>
> Reviewed-by: Rodger Combs <rodger.combs at gmail.com>
> Reviewed-by: Moritz Barsnick <barsnick at gmx.net>
> Reviewed-by: Nicolas George <george at nsup.org>
> Reviewed-by: Ricardo Constantino <wiiaboo at gmail.com>
> Reviewed-by: wm4 <nfxjfg at googlemail.com>
> Tested-by: Andy Furniss <adf.lists at gmail.com>
> Reported-by: Andy Furniss <adf.lists at gmail.com>
> Signed-off-by: Steven Liu <lq at chinaffmpeg.org>
> ---
> configure                |    4 +
> libavformat/Makefile     |    1 +
> libavformat/allformats.c |    2 +-
> libavformat/dashdec.c    | 1800 ++++++++++++++++++++++++++++++++++++++++++++++
> 4 files changed, 1806 insertions(+), 1 deletion(-)
> create mode 100644 libavformat/dashdec.c
> 
> diff --git a/configure b/configure
> index 6dc0b7aad3..5a63240096 100755
> --- a/configure
> +++ b/configure
> @@ -274,6 +274,7 @@ External library support:
>   --enable-libxcb-shape    enable X11 grabbing shape rendering [autodetect]
>   --enable-libxvid         enable Xvid encoding via xvidcore,
>                            native MPEG-4/Xvid encoder exists [no]
> +  --enable-libxml2            enable XML parsing using the C library libxml2 [no]

Misaligned.

>   --enable-libzimg         enable z.lib, needed for zscale filter [no]
>   --enable-libzmq          enable message passing via libzmq [no]
>   --enable-libzvbi         enable teletext support via libzvbi [no]
> @@ -1581,6 +1582,7 @@ EXTERNAL_LIBRARY_LIST="
>     libvpx
>     libwavpack
>     libwebp
> +    libxml2
>     libzimg
>     libzmq
>     libzvbi
> @@ -2916,6 +2918,7 @@ avi_muxer_select="riffenc"
> caf_demuxer_select="iso_media riffdec"
> caf_muxer_select="iso_media"
> dash_muxer_select="mp4_muxer"
> +dash_demuxer_deps="libxml2"
> dirac_demuxer_select="dirac_parser"
> dts_demuxer_select="dca_parser"
> dtshd_demuxer_select="dca_parser"
> @@ -5921,6 +5924,7 @@ enabled openssl           && { use_pkg_config openssl openssl/ssl.h OPENSSL_init
>                                check_lib openssl/ssl.h SSL_library_init -lssl -lcrypto -lws2_32 -lgdi32 ||
>                                die "ERROR: openssl not found"; }
> enabled qtkit_indev      && { check_header_objcc QTKit/QTKit.h || disable qtkit_indev; }
> +enabled libxml2             && require_pkg_config libxml-2.0 libxml2/libxml/xmlversion.h xmlCheckVersion

Misaligned (though the previous line also is).

> 
> # libdc1394 check
> if enabled libdc1394; then
> diff --git a/libavformat/Makefile b/libavformat/Makefile
> index a1dae894fe..37b9838956 100644
> --- a/libavformat/Makefile
> +++ b/libavformat/Makefile
> @@ -135,6 +135,7 @@ OBJS-$(CONFIG_CRC_MUXER)                 += crcenc.o
> OBJS-$(CONFIG_DATA_DEMUXER)              += rawdec.o
> OBJS-$(CONFIG_DATA_MUXER)                += rawenc.o
> OBJS-$(CONFIG_DASH_MUXER)                += dashenc.o
> +OBJS-$(CONFIG_DASH_DEMUXER)              += dashdec.o
> OBJS-$(CONFIG_DAUD_DEMUXER)              += dauddec.o
> OBJS-$(CONFIG_DAUD_MUXER)                += daudenc.o
> OBJS-$(CONFIG_DCSTR_DEMUXER)             += dcstr.o
> diff --git a/libavformat/allformats.c b/libavformat/allformats.c
> index 09e62c3cfc..d57314ba9e 100644
> --- a/libavformat/allformats.c
> +++ b/libavformat/allformats.c
> @@ -96,7 +96,7 @@ static void register_all(void)
>     REGISTER_DEMUXER (CINE,             cine);
>     REGISTER_DEMUXER (CONCAT,           concat);
>     REGISTER_MUXER   (CRC,              crc);
> -    REGISTER_MUXER   (DASH,             dash);
> +    REGISTER_MUXDEMUX(DASH,             dash);
>     REGISTER_MUXDEMUX(DATA,             data);
>     REGISTER_MUXDEMUX(DAUD,             daud);
>     REGISTER_DEMUXER (DCSTR,            dcstr);
> diff --git a/libavformat/dashdec.c b/libavformat/dashdec.c
> new file mode 100644
> index 0000000000..d325dcb2b0
> --- /dev/null
> +++ b/libavformat/dashdec.c
> @@ -0,0 +1,1800 @@
> +/*
> + * Dynamic Adaptive Streaming over HTTP demux
> + * Copyright (c) 2017 samsamsam at o2.pl based on HLS demux
> + * Copyright (c) 2017 Steven Liu
> + *
> + * This file is part of FFmpeg.
> + *
> + * FFmpeg is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU Lesser General Public
> + * License as published by the Free Software Foundation; either
> + * version 2.1 of the License, or (at your option) any later version.
> + *
> + * FFmpeg is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> + * Lesser General Public License for more details.
> + *
> + * You should have received a copy of the GNU Lesser General Public
> + * License along with FFmpeg; if not, write to the Free Software
> + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
> + */
> +#include <libxml/parser.h>
> +#include "libavutil/intreadwrite.h"
> +#include "libavutil/opt.h"
> +#include "libavutil/time.h"
> +#include "libavutil/parseutils.h"
> +#include "internal.h"
> +#include "avio_internal.h"
> +
> +#define INITIAL_BUFFER_SIZE 32768
> +
> +struct fragment {
> +    int64_t url_offset;
> +    int64_t size;
> +    char *url;
> +};
> +
> +/*
> + * reference to : ISO_IEC_23009-1-DASH-2012
> + * Section: 5.3.9.6.2
> + * Table: Table 17 — Semantics of SegmentTimeline element
> + * */
> +struct timeline {
> +    /* t: Element or Attribute Name
> +     * specifies the MPD start time, in @timescale units,
> +     * the first Segment in the series starts relative to the beginning of the Period.
> +     * The value of this attribute must be equal to or greater than the sum of the previous S
> +     * element earliest presentation time and the sum of the contiguous Segment durations.
> +     * If the value of the attribute is greater than what is expressed by the previous S element,
> +     * it expresses discontinuities in the timeline.
> +     * If not present then the value shall be assumed to be zero for the first S element
> +     * and for the subsequent S elements, the value shall be assumed to be the sum of
> +     * the previous S element's earliest presentation time and contiguous duration
> +     * (i.e. previous S at t + @d * (@r + 1)).
> +     * */
> +    int64_t t;
> +    /* r: Element or Attribute Name
> +     * specifies the repeat count of the number of following contiguous Segments with
> +     * the same duration expressed by the value of @d. This value is zero-based
> +     * (e.g. a value of three means four Segments in the contiguous series).
> +     * */
> +    int64_t r;
> +    /* d: Element or Attribute Name
> +     * specifies the Segment duration, in units of the value of the @timescale.
> +     * */
> +    int64_t d;
> +};
> +
> +enum DASHTmplUrlType {
> +    TMP_URL_TYPE_UNSPECIFIED,
> +    TMP_URL_TYPE_NUMBER,
> +    TMP_URL_TYPE_TIME,
> +};
> +
> +/*
> + * Each playlist has its own demuxer. If it is currently active,
> + * it has an opened AVIOContext too, and potentially an AVPacket
> + * containing the next packet from this stream.
> + */
> +struct representation {
> +    char *url_template;
> +    enum DASHTmplUrlType tmp_url_type;
> +    AVIOContext pb;
> +    AVIOContext *input;
> +    AVFormatContext *parent;
> +    AVFormatContext *ctx;
> +    AVPacket pkt;
Unnecessary state.

> +    int rep_idx;
> +    int rep_count;
> +    int stream_index;
> +
> +    enum AVMediaType type;
> +    int64_t target_duration;
> +
> +    int n_fragments;
> +    struct fragment **fragments; /* VOD list of fragment for profile */
> +
> +    int n_timelines;
> +    struct timeline **timelines;
> +
> +    int64_t first_seq_no;
> +    int64_t last_seq_no;
> +
> +    int64_t fragment_duration;
> +    int64_t fragment_timescale;
> +
> +    int64_t cur_seq_no;
> +    int64_t cur_seg_offset;
> +    int64_t cur_seg_size;
> +    struct fragment *cur_seg;
> +
> +    /* Currently active Media Initialization Section */
> +    struct fragment *init_section;
> +    uint8_t *init_sec_buf;
> +    uint32_t init_sec_buf_size;
> +    uint32_t init_sec_data_len;
> +    uint32_t init_sec_buf_read_offset;
> +    int fix_multiple_stsd_order;
> +    int64_t cur_timestamp;
> +};
> +
> +typedef struct DASHContext {
> +    const AVClass *class;
> +    char *base_url;
> +    struct representation *cur_video;
> +    struct representation *cur_audio;
> +    uint64_t media_presentation_duration_sec;
> +    uint64_t suggested_presentation_delay_sec;
> +    uint64_t presentation_delay_sec;
> +    uint64_t availability_start_time_sec;
> +    uint64_t publish_time_sec;
> +    uint64_t minimum_update_period_sec;
> +    uint64_t time_shift_buffer_depth_sec;
> +    uint64_t min_buffer_time_sec;
> +    uint64_t period_duration_sec;
> +    uint64_t period_start_sec;
> +    int is_live;
> +    AVIOInterruptCB *interrupt_callback;
> +    char *user_agent;                    ///< holds HTTP user agent set as an AVOption to the HTTP protocol context
> +    char *cookies;                       ///< holds HTTP cookie values set in either the initial response or as an AVOption to the HTTP protocol context
> +    char *headers;                       ///< holds HTTP headers set as an AVOption to the HTTP protocol context
> +    AVDictionary *avio_opts;
> +} DASHContext;
> +
> +static uint64_t get_current_time_in_sec(void)
> +{
> +    return  av_gettime() / 1000000;
> +}
> +
> +static uint64_t get_utc_date_time_insec(AVFormatContext *s, const char *datetime)
> +{
> +    struct tm timeinfo;
> +    int year = 0;
> +    int month = 0;
> +    int day = 0;
> +    int hour = 0;
> +    int minute = 0;
> +    int ret = 0;
> +    float second = 0.0;
> +
> +    /* ISO-8601 date parser */
> +    if (!datetime)
> +        return 0;
> +
> +    ret = sscanf(datetime, "%d-%d-%dT%d:%d:%fZ", &year, &month, &day, &hour, &minute, &second);
> +    /* year, month, day, hour, minute, second  6 arguments */
> +    if (ret != 6) {
> +        av_log(s, AV_LOG_WARNING, "get_utc_date_time_insec get a wrong time format\n");
> +    }
> +    timeinfo.tm_year = year - 1900;
> +    timeinfo.tm_mon  = month - 1;
> +    timeinfo.tm_mday = day;
> +    timeinfo.tm_hour = hour;
> +    timeinfo.tm_min  = minute;
> +    timeinfo.tm_sec  = (int)second;
> +
> +    return av_timegm(&timeinfo);
> +}
> +
> +static uint32_t get_duration_insec(AVFormatContext *s, const char *duration)
> +{
> +    /* ISO-8601 duration parser */
> +    uint32_t days = 0;
> +    uint32_t hours = 0;
> +    uint32_t mins = 0;
> +    uint32_t secs = 0;
> +    uint32_t size = 0;
> +    float value = 0;
> +    uint8_t type = 0;
> +    const char *ptr = duration;
> +
> +    while (*ptr) {
> +        if (*ptr == 'P' || *ptr == 'T') {
> +            ptr++;
> +            continue;
> +        }
> +
> +        if (sscanf(ptr, "%f%c%n", &value, &type, &size) != 2) {
> +            av_log(s, AV_LOG_WARNING, "get_duration_insec get a wrong time format\n");
> +            return 0; /* parser error */
> +        }
> +        switch (type) {
> +            case 'D':
> +                days = (uint32_t)value;
> +                break;
> +            case 'H':
> +                hours = (uint32_t)value;
> +                break;
> +            case 'M':
> +                mins = (uint32_t)value;
> +                break;
> +            case 'S':
> +                secs = (uint32_t)value;
> +                break;
> +            default:
> +                // handle invalid type
> +                break;
> +        }
> +        ptr += size;
> +    }
> +    return  ((days * 24 + hours) * 60 + mins) * 60 + secs;
> +}
> +
> +static void free_fragment(struct fragment **seg)
> +{
> +    if (!(*seg)) {
No need for the parens here.

> +        return;
> +    }
> +    av_freep(&(*seg)->url);
> +    av_freep(seg);
> +}
> +
> +static void free_fragment_list(struct representation *pls)
> +{
> +    int i;
> +
> +    for (i = 0; i < pls->n_fragments; i++) {
> +        free_fragment(&pls->fragments[i]);
> +    }
> +    av_freep(&pls->fragments);
> +    pls->n_fragments = 0;
> +}
> +
> +static void free_timelines_list(struct representation *pls)
> +{
> +    int i;
> +
> +    for (i = 0; i < pls->n_timelines; i++) {
> +        av_freep(&pls->timelines[i]);
> +    }
> +    av_freep(&pls->timelines);
> +    pls->n_timelines = 0;
> +}
> +
> +/*
> + * Used to reset a statically allocated AVPacket to a clean slate,
> + * containing no data.
> + */
> +static void reset_packet(AVPacket *pkt)
This function is unneeded, for reasons described below.

> +{
> +    av_init_packet(pkt);
> +    pkt->data = NULL;
> +}
> +
> +static void free_representation(struct representation *pls)
> +{
> +    free_fragment_list(pls);
> +    free_timelines_list(pls);
> +    free_fragment(&pls->cur_seg);
> +    free_fragment(&pls->init_section);
> +    av_freep(&pls->init_sec_buf);
> +    av_packet_unref(&pls->pkt);
> +    reset_packet(&pls->pkt);
> +    av_freep(&pls->pb.buffer);
> +    if (pls->input)
> +        ff_format_io_close(pls->parent, &pls->input);
> +    if (pls->ctx) {
> +        pls->ctx->pb = NULL;
> +        avformat_close_input(&pls->ctx);
> +    }
> +
> +    av_free(pls->url_template);
> +    av_free(pls);
> +}
> +
> +static void update_options(char **dest, const char *name, void *src)
> +{
> +    av_freep(dest);
> +    av_opt_get(src, name, AV_OPT_SEARCH_CHILDREN, (uint8_t**)dest);
> +    if (*dest)
> +        av_freep(dest);
> +}
> +
> +static int open_url(AVFormatContext *s, AVIOContext **pb, const char *url,
> +                    AVDictionary *opts, AVDictionary *opts2, int *is_http)
> +{
> +    DASHContext *c = s->priv_data;
> +    AVDictionary *tmp = NULL;
> +    const char *proto_name = NULL;
> +    int ret;
> +    void *p = NULL;
> +
> +    av_dict_copy(&tmp, opts, 0);
> +    av_dict_copy(&tmp, opts2, 0);
> +
> +    if (av_strstart(url, "crypto", NULL)) {
> +        if (url[6] == '+' || url[6] == ':')
> +            proto_name = avio_find_protocol_name(url + 7);
> +    }
> +
> +    if (!proto_name)
> +        proto_name = avio_find_protocol_name(url);
> +
> +    if (!proto_name)
> +        return AVERROR_INVALIDDATA;
> +
> +    // only http(s) & file are allowed
> +    if (!av_strstart(proto_name, "http", NULL) && !av_strstart(proto_name, "file", NULL)) {
> +        return AVERROR_INVALIDDATA;
> +    }
> +    if (!strncmp(proto_name, url, strlen(proto_name)) && url[strlen(proto_name)] == ':') {
> +        ;
> +    } else if (av_strstart(url, "crypto", NULL) && !strncmp(proto_name, url + 7, strlen(proto_name)) && url[7 + strlen(proto_name)] == ':') {
> +        ;
> +    } else if (strcmp(proto_name, "file") || !strncmp(url, "file,", 5)) {
> +        return AVERROR_INVALIDDATA;
> +    }
> +    ret = s->io_open(s, pb, url, AVIO_FLAG_READ, &tmp);
> +    if (ret >= 0) {
> +        // update cookies on http response with setcookies.
> +        p = (s->flags & AVFMT_FLAG_CUSTOM_IO) ? NULL : s->pb;
> +        update_options(&c->cookies, "cookies", p);
> +        av_dict_set(&opts, "cookies", c->cookies, 0);
> +    }
> +
> +    av_dict_free(&tmp);
> +
> +    if (is_http)
> +        *is_http = av_strstart(proto_name, "http", NULL);
> +
> +    return ret;
> +
> +}
> +
> +static char *replace_template_str(const char *url, const char *marker)
> +{
> +    char *prefix = NULL;
> +    char *start = 0;
NULL for consistency.

> +    char *end = NULL;
> +    char *tmp_url = NULL;
> +    int marker_len;
> +
> +    prefix = av_strdup(marker);
This is only ever used with static strings, so you can use a small stack buffer instead of allocating.

> +    marker_len = strlen(prefix) - 1;
> +    prefix[marker_len] = '\0';
Since this is only ever used with static strings, why do all the modification here? Why not just pass in "$Number" and "$Time"?

> +
> +    start = av_stristr(url, prefix);
> +    if (!start)
> +        goto finish;
> +    end = strchr(start + 1, '$');
> +    if (!end)
> +        goto finish;
> +
> +    tmp_url = av_mallocz(MAX_URL_SIZE);
> +    if (!tmp_url) {
> +        return NULL;
If you're going to malloc prefix, this has to be a goto.

> +    }
> +
> +    av_strlcpy(tmp_url, url, start - url+ 1);
url + 1

> +    av_strlcat(tmp_url, start + marker_len, strlen(tmp_url) + end - start - marker_len + 1);
> +    av_strlcat(tmp_url, end + 1, MAX_URL_SIZE);
> +
> +finish:
> +    av_free(prefix);
> +    return tmp_url;
> +}
> +
> +static char *get_content_url(xmlNodePtr *baseurl_nodes,
> +                             int n_baseurl_nodes,
> +                             xmlChar *rep_id_val,
> +                             xmlChar *rep_bandwidth_val,
> +                             xmlChar *val)
> +{
> +    int i;
> +    xmlChar *text;
> +    char *url = NULL;
> +    char *tmp_str = av_mallocz(MAX_URL_SIZE);
> +    char *tmp_str_2 = NULL;
> +
> +    if (!tmp_str) {
> +        return NULL;
> +    }
> +    for (i = 0; i < n_baseurl_nodes; ++i) {
> +        if (baseurl_nodes[i] &&
> +            baseurl_nodes[i]->children &&
> +            baseurl_nodes[i]->children->type == XML_TEXT_NODE) {
> +            text = xmlNodeGetContent(baseurl_nodes[i]->children);
> +            if (text) {
> +                tmp_str_2 = av_mallocz(MAX_URL_SIZE);
> +                if (!tmp_str_2) {
> +                    av_free(tmp_str);
> +                    return NULL;
> +                }
> +                ff_make_absolute_url(tmp_str_2, MAX_URL_SIZE, tmp_str, text);
> +                av_free(tmp_str);
> +                tmp_str = tmp_str_2;
> +                xmlFree(text);
> +            }
> +        }
> +    }
> +    if (val)
> +        av_strlcat(tmp_str, (const char*)val, MAX_URL_SIZE);
> +
> +    if (rep_id_val) {
> +        url = av_strreplace(tmp_str, "$RepresentationID$", (const char*)rep_id_val);
> +        av_free(tmp_str);
> +        tmp_str = url;
> +    }
> +    if (rep_bandwidth_val && tmp_str)
> +        url = av_strreplace(tmp_str, "$Bandwidth$", (const char*)rep_bandwidth_val);
This is also incorrect; $Bandwidth%05d$, for instance, is also valid.

Also, in all of these strings, "$$" is meant to be replaced with "$".

> +    if (tmp_str != url)
> +        av_free(tmp_str);
> +    return url;
> +}
> +
> +static xmlChar *get_val_from_nodes_tab(xmlNodePtr *nodes, const int n_nodes, const xmlChar *attrname)
> +{
> +    int i;
> +    xmlChar *val;
> +
> +    for (i = 0; i < n_nodes; ++i) {
> +        if (nodes[i]) {
> +            val = xmlGetProp(nodes[i], attrname);
> +            if (val)
> +                return val;
> +        }
> +    }
> +
> +    return NULL;
> +}
> +
> +static xmlNodePtr find_child_node_by_name(xmlNodePtr rootnode, const xmlChar *nodename)
> +{
> +    xmlNodePtr node = rootnode;
> +    if (!node) {
> +        return NULL;
> +    }
> +
> +    node = xmlFirstElementChild(node);
> +    while (node) {
> +        if (!xmlStrcmp(node->name, nodename)) {
> +            return node;
> +        }
> +        node = xmlNextElementSibling(node);
> +    }
> +    return NULL;
> +}
> +
> +static void check_full_number(struct representation *rep)
> +{
> +    char *temp_string = NULL;
> +
> +    if (av_stristr(rep->url_template, "$Number$")) {
> +        temp_string = av_strreplace(rep->url_template, "$Number$", "$Number%d$");
> +        av_free(rep->url_template);
> +        rep->url_template = temp_string;
> +    }
> +}
> +
> +static enum AVMediaType get_content_type(xmlNodePtr node)
> +{
> +    enum AVMediaType type = AVMEDIA_TYPE_UNKNOWN;
> +    int i = 0;
> +    const char *attr;
> +
> +    if (node) {
> +        while (type == AVMEDIA_TYPE_UNKNOWN && i < 2) {
> +            attr = (i) ? "mimeType" : "contentType";
> +            xmlChar *val = xmlGetProp(node, attr);
> +            if (val) {
> +                if (av_stristr((const char *)val, "video")) {
> +                    type = AVMEDIA_TYPE_VIDEO;
> +                } else if (av_stristr((const char *)val, "audio")) {
> +                    type = AVMEDIA_TYPE_AUDIO;
> +                }
> +                xmlFree(val);
> +            }
> +            i++;
> +        }
> +    }
> +    return type;
> +}
> +
> +static int parse_manifest_segmenturlnode(AVFormatContext *s, struct representation *rep,
> +                                         xmlNodePtr fragmenturl_node,
> +                                         xmlNodePtr *baseurl_nodes,
> +                                         xmlChar *rep_id_val,
> +                                         xmlChar *rep_bandwidth_val)
> +{
> +    xmlChar *initialization_val = NULL;
> +    xmlChar *media_val = NULL;
> +
> +    if (!xmlStrcmp(fragmenturl_node->name, (const xmlChar *)"Initialization")) {
> +        initialization_val = xmlGetProp(fragmenturl_node, "sourceURL");
> +        if (initialization_val) {
> +            rep->init_section = av_mallocz(sizeof(struct fragment));
> +            if (!rep->init_section) {
> +                xmlFree(initialization_val);
> +                return AVERROR(ENOMEM);
> +            }
> +            rep->init_section->url = get_content_url(baseurl_nodes, 4,
> +                                                     rep_id_val,
> +                                                     rep_bandwidth_val,
> +                                                     initialization_val);
> +            if (!rep->init_section->url) {
> +                av_free(rep->init_section);
> +                xmlFree(initialization_val);
> +                return AVERROR(ENOMEM);
> +            }
> +            rep->init_section->size = -1;
> +            xmlFree(initialization_val);
> +        }
> +    } else if (!xmlStrcmp(fragmenturl_node->name, (const xmlChar *)"SegmentURL")) {
> +        media_val = xmlGetProp(fragmenturl_node, "media");
> +        if (media_val) {
> +            struct fragment *seg = av_mallocz(sizeof(struct fragment));
> +            if (!seg) {
> +                xmlFree(media_val);
> +                return AVERROR(ENOMEM);
> +            }
> +            seg->url = get_content_url(baseurl_nodes, 4,
> +                                       rep_id_val,
> +                                       rep_bandwidth_val,
> +                                       media_val);
> +            if (!seg->url) {
> +                av_free(seg);
> +                xmlFree(media_val);
> +                return AVERROR(ENOMEM);
> +            }
> +            seg->size = -1;
> +            dynarray_add(&rep->fragments, &rep->n_fragments, seg);
> +            xmlFree(media_val);
> +        }
> +    }
> +
> +    return 0;
> +}
> +
> +static int parse_manifest_segmenttimeline(AVFormatContext *s, struct representation *rep,
> +                                          xmlNodePtr fragment_timeline_node)
> +{
> +    xmlAttrPtr attr = NULL;
> +    xmlChar *val  = NULL;
> +
> +    if (!xmlStrcmp(fragment_timeline_node->name, (const xmlChar *)"S")) {
> +        struct timeline *tml = av_mallocz(sizeof(struct timeline));
> +        if (!tml) {
> +            return AVERROR(ENOMEM);
> +        }
> +        attr = fragment_timeline_node->properties;
> +        while (attr) {
> +            val = xmlGetProp(fragment_timeline_node, attr->name);
> +
> +            if (!val) {
> +                av_log(s, AV_LOG_WARNING, "parse_manifest_segmenttimeline attr->name = %s val is NULL\n", attr->name);
> +                continue;
> +            }
> +
> +            if (!xmlStrcmp(attr->name, (const xmlChar *)"t")) {
> +                tml->t = (int64_t)strtoll(val, NULL, 10);
> +            } else if (!xmlStrcmp(attr->name, (const xmlChar *)"r")) {
> +                tml->r =(int64_t) strtoll(val, NULL, 10);
> +            } else if (!xmlStrcmp(attr->name, (const xmlChar *)"d")) {
> +                tml->d = (int64_t)strtoll(val, NULL, 10);
> +                rep->fragment_duration = (int64_t) strtoll(val, NULL, 10);
> +            }
> +            attr = attr->next;
> +            xmlFree(val);
> +        }
> +        dynarray_add(&rep->timelines, &rep->n_timelines, tml);
> +    }
> +
> +    return 0;
> +}
> +
> +static int parse_manifest_representation(AVFormatContext *s, const char *url,
> +                                         xmlNodePtr node,
> +                                         xmlNodePtr adaptionset_node,
> +                                         xmlNodePtr mpd_baseurl_node,
> +                                         xmlNodePtr period_baseurl_node,
> +                                         xmlNodePtr fragment_template_node,
> +                                         xmlNodePtr content_component_node,
> +                                         xmlNodePtr adaptionset_baseurl_node)
> +{
> +    int32_t ret = 0;
> +    int32_t audio_rep_idx = 0;
> +    int32_t video_rep_idx = 0;
> +    char *temp_string = NULL;
> +    DASHContext *c = s->priv_data;
> +    struct representation *rep = NULL;
> +    struct fragment *seg = NULL;
> +    xmlNodePtr representation_segmenttemplate_node = NULL;
> +    xmlNodePtr representation_baseurl_node = NULL;
> +    xmlNodePtr representation_segmentlist_node = NULL;
> +    xmlNodePtr fragment_timeline_node = NULL;
> +    xmlNodePtr fragment_templates_tab[2];
> +    xmlChar *duration_val = NULL;
> +    xmlChar *startnumber_val = NULL;
> +    xmlChar *timescale_val = NULL;
> +    xmlChar *initialization_val = NULL;
> +    xmlChar *media_val = NULL;
> +    xmlNodePtr baseurl_nodes[4];
> +    xmlNodePtr representation_node = node;
> +    xmlChar *rep_id_val = xmlGetProp(representation_node, "id");
> +    xmlChar *rep_bandwidth_val = xmlGetProp(representation_node, "bandwidth");
> +    enum AVMediaType type = AVMEDIA_TYPE_UNKNOWN;
> +
> +    // try get information from representation
> +    if (type == AVMEDIA_TYPE_UNKNOWN)
> +        type = get_content_type(representation_node);
> +    // try get information from contentComponen
> +    if (type == AVMEDIA_TYPE_UNKNOWN)
> +        type = get_content_type(content_component_node);
> +    // try get information from adaption set
> +    if (type == AVMEDIA_TYPE_UNKNOWN)
> +        type = get_content_type(adaptionset_node);
> +    if (type == AVMEDIA_TYPE_UNKNOWN) {
> +        av_log(s, AV_LOG_VERBOSE, "Parsing '%s' - skipp not supported representation type\n", url);
> +    } else if ((type == AVMEDIA_TYPE_VIDEO && !c->cur_video) || (type == AVMEDIA_TYPE_AUDIO && !c->cur_audio)) {
> +        // convert selected representation to our internal struct
> +        rep = av_mallocz(sizeof(struct representation));
> +        if (!rep) {
> +            ret = AVERROR(ENOMEM);
> +            goto end;
> +        }
> +        representation_segmenttemplate_node = find_child_node_by_name(representation_node, "SegmentTemplate");
> +        representation_baseurl_node = find_child_node_by_name(representation_node, "BaseURL");
> +        representation_segmentlist_node = find_child_node_by_name(representation_node, "SegmentList");
> +        reset_packet(&rep->pkt);
> +
> +        baseurl_nodes[0] = mpd_baseurl_node;
> +        baseurl_nodes[1] = period_baseurl_node;
> +        baseurl_nodes[2] = adaptionset_baseurl_node;
> +        baseurl_nodes[3] = representation_baseurl_node;
> +
> +        if (representation_segmenttemplate_node || fragment_template_node) {
> +            fragment_timeline_node = NULL;
> +            fragment_templates_tab[0] = representation_segmenttemplate_node;
> +            fragment_templates_tab[1] = fragment_template_node;
> +
> +            duration_val = get_val_from_nodes_tab(fragment_templates_tab, 2, "duration");
> +            startnumber_val = get_val_from_nodes_tab(fragment_templates_tab, 2, "startNumber");
> +            timescale_val = get_val_from_nodes_tab(fragment_templates_tab, 2, "timescale");
> +            initialization_val = get_val_from_nodes_tab(fragment_templates_tab, 2, "initialization");
> +            media_val = get_val_from_nodes_tab(fragment_templates_tab, 2, "media");
> +
> +            if (initialization_val) {
> +                rep->init_section = av_mallocz(sizeof(struct fragment));
> +                if (!rep->init_section) {
> +                    av_free(rep);
> +                    ret = AVERROR(ENOMEM);
> +                    goto end;
> +                }
> +                rep->init_section->url = get_content_url(baseurl_nodes, 4,
> +                                                         rep_id_val,
> +                                                         rep_bandwidth_val,
> +                                                         initialization_val);
> +                if (!rep->init_section->url) {
> +                    av_free(rep->init_section);
> +                    av_free(rep);
> +                    ret = AVERROR(ENOMEM);
> +                    goto end;
> +                }
> +                rep->init_section->size = -1;
> +                xmlFree(initialization_val);
> +            }
> +
> +            if (media_val) {
> +                rep->url_template = get_content_url(baseurl_nodes, 4,
> +                                                    rep_id_val,
> +                                                    rep_bandwidth_val,
> +                                                    media_val);
> +                temp_string = rep->url_template;
> +                if (temp_string) {
> +                    if (av_stristr(temp_string, "$Number")) {
> +                        rep->tmp_url_type = TMP_URL_TYPE_NUMBER;  /* Number-Based. */
> +                        check_full_number(rep);
> +                    } else if (av_stristr(temp_string, "$Time")) {
> +                        rep->tmp_url_type = TMP_URL_TYPE_TIME; /* Time-Based. */
"$Time$" is just as valid as "$Number$"; check it the same way as above.

> +                    } else {
> +                        temp_string = NULL;
> +                    }
> +                }
> +                xmlFree(media_val);
> +            }
> +            if (duration_val) {
> +                rep->fragment_duration = (int64_t) strtoll(duration_val, NULL, 10);
> +                xmlFree(duration_val);
> +            }
> +            if (timescale_val) {
> +                rep->fragment_timescale = (int64_t) strtoll(timescale_val, NULL, 10);
> +                xmlFree(timescale_val);
> +            }
> +            if (startnumber_val) {
> +                rep->first_seq_no = (int64_t) strtoll(startnumber_val, NULL, 10);
> +                xmlFree(startnumber_val);
> +            }
> +
> +            fragment_timeline_node = find_child_node_by_name(representation_segmenttemplate_node, "SegmentTimeline");
> +
> +            if (!fragment_timeline_node)
> +                fragment_timeline_node = find_child_node_by_name(fragment_template_node, "SegmentTimeline");
> +            if (fragment_timeline_node) {
> +                fragment_timeline_node = xmlFirstElementChild(fragment_timeline_node);
> +                while (fragment_timeline_node) {
> +                    ret = parse_manifest_segmenttimeline(s, rep, fragment_timeline_node);
> +                    if (ret < 0) {
> +                        return ret;
> +                    }
> +                    fragment_timeline_node = xmlNextElementSibling(fragment_timeline_node);
> +                }
> +            }
> +        } else if (representation_baseurl_node && !representation_segmentlist_node) {
> +            seg = av_mallocz(sizeof(struct fragment));
> +            if (!seg) {
> +                ret = AVERROR(ENOMEM);
> +                goto end;
> +            }
> +            seg->url = get_content_url(baseurl_nodes, 4, rep_id_val, rep_bandwidth_val, NULL);
> +            if (!seg->url) {
> +                av_free(seg);
> +                ret = AVERROR(ENOMEM);
> +                goto end;
> +            }
> +            seg->size = -1;
> +            dynarray_add(&rep->fragments, &rep->n_fragments, seg);
> +        } else if (!representation_baseurl_node && representation_segmentlist_node) {
> +            // TODO: https://www.brendanlong.com/the-structure-of-an-mpeg-dash-mpd.html
> +            // http://www-itec.uni-klu.ac.at/dash/ddash/mpdGenerator.php?fragmentlength=15&type=full
> +            xmlNodePtr fragmenturl_node = NULL;
> +            duration_val = xmlGetProp(representation_segmentlist_node, "duration");
> +            timescale_val = xmlGetProp(representation_segmentlist_node, "timescale");
> +            if (duration_val) {
> +                rep->fragment_duration = (int64_t) strtoll(duration_val, NULL, 10);
> +                xmlFree(duration_val);
> +            }
> +            if (timescale_val) {
> +                rep->fragment_timescale = (int64_t) strtoll(timescale_val, NULL, 10);
> +                xmlFree(timescale_val);
> +            }
> +            fragmenturl_node = xmlFirstElementChild(representation_segmentlist_node);
> +            while (fragmenturl_node) {
> +                ret = parse_manifest_segmenturlnode(s, rep, fragmenturl_node,
> +                                                    baseurl_nodes,
> +                                                    rep_id_val,
> +                                                    rep_bandwidth_val);
> +                if (ret < 0) {
> +                    return ret;
> +                }
> +                fragmenturl_node = xmlNextElementSibling(fragmenturl_node);
> +            }
> +        } else {
> +            free_representation(rep);
> +            rep = NULL;
> +            av_log(s, AV_LOG_ERROR, "Unknown format of Representation node id[%s] \n", (const char *)rep_id_val);
> +        }
> +
> +        if (rep) {
> +            if (rep->fragment_duration > 0 && !rep->fragment_timescale)
> +                rep->fragment_timescale = 1;
> +            if (type == AVMEDIA_TYPE_VIDEO) {
> +                rep->rep_idx = video_rep_idx;
> +                c->cur_video = rep;
> +            } else {
> +                rep->rep_idx = audio_rep_idx;
> +                c->cur_audio = rep;
> +            }
> +        }
> +    }
> +
> +    video_rep_idx += type == AVMEDIA_TYPE_VIDEO;
> +    audio_rep_idx += type == AVMEDIA_TYPE_AUDIO;
> +
> +end:
> +    if (rep_id_val)
> +        xmlFree(rep_id_val);
> +    if (rep_bandwidth_val)
> +        xmlFree(rep_bandwidth_val);
> +
> +    return ret;
> +}
> +
> +static int parse_manifest_adaptationset(AVFormatContext *s, const char *url,
> +                                        xmlNodePtr adaptionset_node,
> +                                        xmlNodePtr mpd_baseurl_node,
> +                                        xmlNodePtr period_baseurl_node)
> +{
> +    int ret = 0;
> +    xmlNodePtr fragment_template_node = NULL;
> +    xmlNodePtr content_component_node = NULL;
> +    xmlNodePtr adaptionset_baseurl_node = NULL;
> +    xmlNodePtr node = NULL;
> +
> +    node = xmlFirstElementChild(adaptionset_node);
> +    while (node) {
> +        if (!xmlStrcmp(node->name, (const xmlChar *)"SegmentTemplate")) {
> +            fragment_template_node = node;
> +        } else if (!xmlStrcmp(node->name, (const xmlChar *)"ContentComponent")) {
> +            content_component_node = node;
> +        } else if (!xmlStrcmp(node->name, (const xmlChar *)"BaseURL")) {
> +            adaptionset_baseurl_node = node;
> +        } else if (!xmlStrcmp(node->name, (const xmlChar *)"Representation")) {
> +            ret = parse_manifest_representation(s, url, node,
> +                                                adaptionset_node,
> +                                                mpd_baseurl_node,
> +                                                period_baseurl_node,
> +                                                fragment_template_node,
> +                                                content_component_node,
> +                                                adaptionset_baseurl_node);
> +            if (ret < 0) {
> +                return ret;
> +            }
> +        }
> +        node = xmlNextElementSibling(node);
> +    }
> +    return 0;
> +}
> +
> +
> +static int parse_manifest(AVFormatContext *s, const char *url, AVIOContext *in)
> +{
> +    DASHContext *c = s->priv_data;
> +    int ret = 0;
> +    int close_in = 0;
> +    uint8_t *new_url = NULL;
> +    int64_t filesize = 0;
> +    char *buffer = NULL;
> +    AVDictionary *opts = NULL;
> +    xmlDoc *doc = NULL;
> +    xmlNodePtr root_element = NULL;
> +    xmlNodePtr node = NULL;
> +    xmlNodePtr period_node = NULL;
> +    xmlNodePtr mpd_baseurl_node = NULL;
> +    xmlNodePtr period_baseurl_node = NULL;
> +    xmlNodePtr adaptionset_node = NULL;
> +    xmlAttrPtr attr = NULL;
> +    xmlChar *val  = NULL;
> +    uint32_t perdiod_duration_sec = 0;
> +    uint32_t perdiod_start_sec = 0;
> +    int32_t audio_rep_idx = 0;
> +    int32_t video_rep_idx = 0;
> +
> +    if (!in) {
> +        close_in = 1;
> +        /* This is XML manifest there is no need to set range header */
> +        av_dict_set(&opts, "seekable", "0", 0);
> +        // broker prior HTTP options that should be consistent across requests
> +        av_dict_set(&opts, "user-agent", c->user_agent, 0);
> +        av_dict_set(&opts, "cookies", c->cookies, 0);
> +        av_dict_set(&opts, "headers", c->headers, 0);
> +
> +        ret = avio_open2(&in, url, AVIO_FLAG_READ, c->interrupt_callback, &opts);
> +        av_dict_free(&opts);
> +        if (ret < 0)
> +            return ret;
> +    }
> +
> +    if (av_opt_get(in, "location", AV_OPT_SEARCH_CHILDREN, &new_url) >= 0) {
> +        c->base_url = av_strdup(new_url);
> +    } else {
> +        c->base_url = av_strdup(url);
> +    }
> +
> +    filesize = avio_size(in);
> +    if (filesize <= 0) {
> +        filesize = 8 * 1024;
> +    }
> +
> +    buffer = av_mallocz(filesize);
> +    if (!buffer) {
> +        return AVERROR(ENOMEM);
> +    }
> +
> +    filesize = avio_read(in, buffer, filesize);
> +    if (filesize > 0) {
> +        LIBXML_TEST_VERSION
> +
> +        doc = xmlReadMemory(buffer, filesize, c->base_url, NULL, 0);
> +        root_element = xmlDocGetRootElement(doc);
> +        node = root_element;
> +
> +        if (!node) {
> +            ret = AVERROR_INVALIDDATA;
> +            av_log(s, AV_LOG_ERROR, "Unable to parse '%s' - missing root node\n", url);
> +            goto cleanup;
> +        }
> +
> +        if (node->type != XML_ELEMENT_NODE ||
> +            xmlStrcmp(node->name, (const xmlChar *)"MPD")) {
> +            ret = AVERROR_INVALIDDATA;
> +            av_log(s, AV_LOG_ERROR, "Unable to parse '%s' - wrong root node name[%s] type[%d]\n", url, node->name, (int)node->type);
> +            goto cleanup;
> +        }
> +
> +        val = xmlGetProp(node, "type");
> +        if (!val) {
> +            av_log(s, AV_LOG_ERROR, "Unable to parse '%s' - missing type attrib\n", url);
> +            ret = AVERROR_INVALIDDATA;
> +            goto cleanup;
> +        }
> +        if (!xmlStrcmp(val, (const xmlChar *)"dynamic"))
> +            c->is_live = 1;
> +        xmlFree(val);
> +
> +        attr = node->properties;
> +        while (attr) {
> +            val = xmlGetProp(node, attr->name);
> +
> +            if (!xmlStrcmp(attr->name, (const xmlChar *)"availabilityStartTime")) {
> +                c->availability_start_time_sec = get_utc_date_time_insec(s, (const char *)val);
> +            } else if (!xmlStrcmp(attr->name, (const xmlChar *)"publishTime")) {
> +                c->publish_time_sec = get_utc_date_time_insec(s, (const char *)val);
> +            } else if (!xmlStrcmp(attr->name, (const xmlChar *)"minimumUpdatePeriod")) {
> +                c->minimum_update_period_sec = get_duration_insec(s, (const char *)val);
> +            } else if (!xmlStrcmp(attr->name, (const xmlChar *)"timeShiftBufferDepth")) {
> +                c->time_shift_buffer_depth_sec = get_duration_insec(s, (const char *)val);
> +            } else if (!xmlStrcmp(attr->name, (const xmlChar *)"minBufferTime")) {
> +                c->min_buffer_time_sec = get_duration_insec(s, (const char *)val);
> +            } else if (!xmlStrcmp(attr->name, (const xmlChar *)"suggestedPresentationDelay")) {
> +                c->suggested_presentation_delay_sec = get_duration_insec(s, (const char *)val);
> +            } else if (!xmlStrcmp(attr->name, (const xmlChar *)"mediaPresentationDuration")) {
> +                c->media_presentation_duration_sec = get_duration_insec(s, (const char *)val);
> +            }
> +            attr = attr->next;
> +            xmlFree(val);
> +        }
> +
> +        mpd_baseurl_node = find_child_node_by_name(node, "BaseURL");
> +
> +        // at now we can handle only one period, with the longest duration
> +        node = xmlFirstElementChild(node);
> +        while (node) {
> +            if (!xmlStrcmp(node->name, (const xmlChar *)"Period")) {
> +                perdiod_duration_sec = 0;
> +                perdiod_start_sec = 0;
> +                attr = node->properties;
> +                while (attr) {
> +                    val = xmlGetProp(node, attr->name);
> +                    if (!xmlStrcmp(attr->name, (const xmlChar *)"duration")) {
> +                        perdiod_duration_sec = get_duration_insec(s, (const char *)val);
> +                    } else if (!xmlStrcmp(attr->name, (const xmlChar *)"start")) {
> +                        perdiod_start_sec = get_duration_insec(s, (const char *)val);
> +                    }
> +                    attr = attr->next;
> +                    xmlFree(val);
> +                }
> +                if ((perdiod_duration_sec) >= (c->period_duration_sec)) {
> +                    period_node = node;
> +                    c->period_duration_sec = perdiod_duration_sec;
> +                    c->period_start_sec = perdiod_start_sec;
> +                    if (c->period_start_sec > 0)
> +                        c->media_presentation_duration_sec = c->period_duration_sec;
> +                }
> +            }
> +            node = xmlNextElementSibling(node);
> +        }
> +        if (!period_node) {
> +            av_log(s, AV_LOG_ERROR, "Unable to parse '%s' - missing Period node\n", url);
> +            ret = AVERROR_INVALIDDATA;
> +            goto cleanup;
> +        }
> +
> +        adaptionset_node = xmlFirstElementChild(period_node);
> +        while (adaptionset_node) {
> +            if (!xmlStrcmp(adaptionset_node->name, (const xmlChar *)"BaseURL")) {
> +                period_baseurl_node = adaptionset_node;
> +            } else if (!xmlStrcmp(adaptionset_node->name, (const xmlChar *)"AdaptationSet")) {
> +                parse_manifest_adaptationset(s, url, adaptionset_node, mpd_baseurl_node, period_baseurl_node);
> +            }
> +            adaptionset_node = xmlNextElementSibling(adaptionset_node);
> +        }
> +        if (c->cur_video) {
> +            c->cur_video->rep_count = video_rep_idx;
> +            c->cur_video->fix_multiple_stsd_order = 1;
> +            av_log(s, AV_LOG_VERBOSE, "rep_idx[%d]\n", (int)c->cur_video->rep_idx);
> +            av_log(s, AV_LOG_VERBOSE, "rep_count[%d]\n", (int)video_rep_idx);
> +        }
> +        if (c->cur_audio) {
> +            c->cur_audio->rep_count = audio_rep_idx;
> +        }
> +
> +cleanup:
> +        /*free the document */
> +        xmlFreeDoc(doc);
> +        xmlCleanupParser();
> +    } else {
> +        av_log(s, AV_LOG_ERROR, "Unable to read to offset '%s'\n", url);
> +        ret = AVERROR_INVALIDDATA;
> +    }
> +
> +    av_free(new_url);
> +    av_free(buffer);
> +    if (close_in) {
> +        avio_close(in);
> +    }
> +    return ret;
> +}
> +
> +static int64_t calc_cur_seg_no(AVFormatContext *s, struct representation *pls)
> +{
> +    DASHContext *c = pls->parent->priv_data;
> +    int64_t num = 0;
> +
> +    if (c->is_live) {
> +        num = pls->first_seq_no + (((get_current_time_in_sec() - c->availability_start_time_sec) - c->presentation_delay_sec) * pls->fragment_timescale) / pls->fragment_duration;
> +    } else {
> +        num = pls->first_seq_no;
> +    }
> +    return num;
> +}
> +
> +static int64_t calc_min_seg_no(AVFormatContext *s, struct representation *pls)
> +{
> +    DASHContext *c = pls->parent->priv_data;
> +    int64_t num = 0;
> +
> +    if (c->is_live) {
> +        num = pls->first_seq_no + (((get_current_time_in_sec() - c->availability_start_time_sec) - c->time_shift_buffer_depth_sec) * pls->fragment_timescale)  / pls->fragment_duration;
> +    } else {
> +        num = pls->first_seq_no;
> +    }
> +    return num;
> +}
> +
> +static int64_t calc_max_seg_no(AVFormatContext *s, struct representation *pls)
> +{
> +    DASHContext *c = pls->parent->priv_data;
> +    int64_t num = 0;
> +    int64_t i = 0;
> +
> +    if (c->is_live) {
> +        num = pls->first_seq_no + (((get_current_time_in_sec() - c->availability_start_time_sec)) * pls->fragment_timescale)  / pls->fragment_duration;
> +    } else {
> +        if (pls->n_fragments) {
> +            num = pls->first_seq_no + pls->n_fragments - 1;
> +        } else if (pls->n_timelines) {
> +            num = pls->first_seq_no + pls->n_timelines - 1;
> +            for (i = 0; i < pls->n_timelines; ++i) {
> +                num += pls->timelines[i]->r;
> +            }
> +        } else {
> +            num = pls->first_seq_no + (c->media_presentation_duration_sec * pls->fragment_timescale) / pls->fragment_duration;
> +        }
> +    }
> +
> +    return num;
> +}
> +
> +static int64_t get_fragment_start_time(struct representation *pls, int64_t cur_seq_no)
> +{
> +    int64_t i = 0;
> +    int64_t j = 0;
> +    int64_t num = 0;
> +    int64_t startTime = 0;
> +
> +    if (pls->n_timelines) {
> +        for (i = 0; i < pls->n_timelines; ++i) {
> +            if (pls->timelines[i]->t > 0) {
> +                startTime = pls->timelines[i]->t;
> +            }
> +            if (num == cur_seq_no)
> +                goto finish;
> +            startTime += pls->timelines[i]->d;
> +            for (j = 0; j < pls->timelines[i]->r; ++j) {
> +                num++;
> +                if (num == cur_seq_no)
> +                    goto finish;
> +                startTime += pls->timelines[i]->d;
> +            }
> +            num++;
> +        }
> +    }
> +
> +finish:
> +    return startTime;
> +}
> +
> +static struct fragment *get_current_fragment(struct representation *pls)
> +{
> +    int64_t tmp_val = 0;
> +    int64_t min_seq_no = 0;
> +    int64_t max_seq_no = 0;
> +    char buffer[1024];
> +    char *tmp_str = NULL;
> +    struct fragment *seg = NULL;
> +    struct fragment *seg_ptr = NULL;
> +    DASHContext *c = pls->parent->priv_data;
> +
> +    if (pls->n_fragments > 0) {
> +        if (pls->cur_seq_no < pls->n_fragments) {
> +            seg_ptr = pls->fragments[pls->cur_seq_no];
> +            seg = av_mallocz(sizeof(struct fragment));
> +            if (!seg) {
> +                return NULL;
> +            }
> +            seg->url = av_strdup(seg_ptr->url);
> +            if (!seg->url) {
> +                av_free(seg);
> +                return NULL;
> +            }
> +            seg->size = seg_ptr->size;
> +            seg->url_offset = seg_ptr->url_offset;
> +            return seg;
> +        }
> +    }
> +    if (c->is_live) {
> +        while (1) {
> +            min_seq_no = calc_min_seg_no(pls->parent, pls);
> +            max_seq_no = calc_max_seg_no(pls->parent, pls);
> +
> +            if (pls->cur_seq_no <= min_seq_no) {
> +                av_log(pls->parent, AV_LOG_VERBOSE, "old fragment: cur[%"PRId64"] min[%"PRId64"] max[%"PRId64"], playlist %d\n",
> +                       (int64_t)pls->cur_seq_no, min_seq_no, max_seq_no, (int)pls->rep_idx);
> +                pls->cur_seq_no = calc_cur_seg_no(pls->parent, pls);
> +            } else if (pls->cur_seq_no > max_seq_no) {
> +                av_log(pls->parent, AV_LOG_VERBOSE, "new fragment: min[%"PRId64"] max[%"PRId64"], playlist %d\n",
> +                       min_seq_no, max_seq_no, (int)pls->rep_idx);
> +                av_usleep(1000);
> +                continue;
> +            }
> +            break;
> +        }
> +        seg = av_mallocz(sizeof(struct fragment));
> +        if (!seg) {
> +            return NULL;
> +        }
> +    } else if (pls->cur_seq_no <= pls->last_seq_no) {
> +        seg = av_mallocz(sizeof(struct fragment));
> +        if (!seg) {
> +            return NULL;
> +        }
> +    }
> +    if (seg) {
> +        if (pls->tmp_url_type != TMP_URL_TYPE_UNSPECIFIED) {
> +            tmp_val = pls->tmp_url_type == TMP_URL_TYPE_NUMBER ? pls->cur_seq_no : get_fragment_start_time(pls, pls->cur_seq_no);
> +            if (av_get_frame_filename(buffer, sizeof(buffer), pls->url_template, (int64_t)tmp_val) < 0) {
As mentioned previously, you can't use this on the whole template; only on the section being replaced. You should adjust replace_template_str to take an argument for the value being substituted, and handle this in there. I'd also recommend dropping the "insert %d" mechanism (check_full_number) in favor of handling it within replace_template_str.

> +                av_log(pls->parent, AV_LOG_ERROR, "Invalid segment filename template %s\n", pls->url_template);
> +                return NULL;
> +            }
> +
> +            if (pls->tmp_url_type == TMP_URL_TYPE_NUMBER) {
> +                tmp_str = replace_template_str(buffer, "$Number$");
> +            } else if (pls->tmp_url_type == TMP_URL_TYPE_TIME) {
> +                tmp_str = replace_template_str(buffer, "$Time$");
> +            } else {
> +                av_log(pls->parent, AV_LOG_ERROR, "Invalid tmp_url_type\n");
> +                return NULL;
This leaks seg.

> +            }
> +
> +            seg->url = av_strdup(tmp_str);
I still don't understand why you dup this and then free the original.

> +            if (!seg->url) {
> +                av_free(tmp_str);
> +                return NULL;
This also leaks seg.

> +            }
> +        } else {
> +            av_log(pls->parent, AV_LOG_ERROR, "Unable to unable to resolve template url '%s'\n", pls->url_template);
> +            seg->url = av_strdup(pls->url_template);
> +            if (!seg->url) {
> +                return NULL;
> +            }
> +        }
> +        seg->size = -1;
> +    }
> +
> +    av_free(tmp_str);
> +    return seg;
> +}
> +
> +enum ReadFromURLMode {
> +    READ_NORMAL,
> +    READ_COMPLETE,
> +};
> +
> +static int read_from_url(struct representation *pls, struct fragment *seg,
> +                         uint8_t *buf, int buf_size,
> +                         enum ReadFromURLMode mode)
> +{
> +    int ret;
> +
> +    /* limit read if the fragment was only a part of a file */
> +    if (seg->size >= 0)
> +        buf_size = FFMIN(buf_size, pls->cur_seg_size - pls->cur_seg_offset);
> +
> +    if (mode == READ_COMPLETE) {
> +        ret = avio_read(pls->input, buf, buf_size);
> +        if (ret < buf_size) {
> +            av_log(pls->parent, AV_LOG_WARNING, "Could not read complete fragment.\n");
> +        }
> +    } else {
> +        ret = avio_read(pls->input, buf, buf_size);
> +    }
> +    if (ret > 0)
> +        pls->cur_seg_offset += ret;
> +
> +    return ret;
> +}
> +
> +static int open_input(DASHContext *c, struct representation *pls, struct fragment *seg)
> +{
> +    AVDictionary *opts = NULL;
> +    char url[MAX_URL_SIZE];
> +    int ret;
> +
> +    // broker prior HTTP options that should be consistent across requests
> +    av_dict_set(&opts, "user-agent", c->user_agent, 0);
> +    av_dict_set(&opts, "cookies", c->cookies, 0);
> +    av_dict_set(&opts, "headers", c->headers, 0);
> +    if (c->is_live) {
> +        av_dict_set(&opts, "seekable", "0", 0);
> +    }
> +
> +    if (seg->size >= 0) {
> +        /* try to restrict the HTTP request to the part we want
> +         * (if this is in fact a HTTP request) */
> +        av_dict_set_int(&opts, "offset", seg->url_offset, 0);
> +        av_dict_set_int(&opts, "end_offset", seg->url_offset + seg->size, 0);
> +    }
> +
> +    ff_make_absolute_url(url, MAX_URL_SIZE, c->base_url, seg->url);
> +    av_log(pls->parent, AV_LOG_VERBOSE, "DASH request for url '%s', offset %"PRId64", playlist %d\n",
> +           url, seg->url_offset, pls->rep_idx);
> +    ret = open_url(pls->parent, &pls->input, url, c->avio_opts, opts, NULL);
> +    if (ret < 0) {
> +        goto cleanup;
> +    }
> +
> +    /* Seek to the requested position. If this was a HTTP request, the offset
> +     * should already be where want it to, but this allows e.g. local testing
> +     * without a HTTP server. */
> +    if (!ret && seg->url_offset) {
> +        int64_t seekret = avio_seek(pls->input, seg->url_offset, SEEK_SET);
> +        if (seekret < 0) {
> +            av_log(pls->parent, AV_LOG_ERROR, "Unable to seek to offset %"PRId64" of DASH fragment '%s'\n", seg->url_offset, seg->url);
> +            ret = (int) seekret;
> +            ff_format_io_close(pls->parent, &pls->input);
> +        }
> +    }
> +
> +cleanup:
> +    av_dict_free(&opts);
> +    pls->cur_seg_offset = 0;
> +    pls->cur_seg_size = seg->size;
> +    return ret;
> +}
> +
> +static int update_init_section(struct representation *pls)
> +{
> +    static const int max_init_section_size = 1024*1024;
> +    DASHContext *c = pls->parent->priv_data;
> +    int64_t sec_size = 0;
> +    int64_t urlsize = 0;
> +    int ret = 0;
> +
> +    /* read init section only once per representation */
> +    if (!pls->init_section || pls->init_sec_buf) {
> +        return 0;
> +    }
> +
> +    ret = open_input(c, pls, pls->init_section);
> +    if (ret < 0) {
> +        av_log(pls->parent, AV_LOG_WARNING, "Failed to open an initialization section in playlist %d\n", pls->rep_idx);
> +        return ret;
> +    }
> +
> +    if (pls->init_section->size >= 0) {
> +        sec_size = pls->init_section->size;
> +    } else if ((urlsize = avio_size(pls->input)) >= 0) {
> +        sec_size = urlsize;
> +    } else {
> +        sec_size = max_init_section_size;
> +    }
> +    av_log(pls->parent, AV_LOG_DEBUG, "Downloading an initialization section of size %"PRId64"\n", sec_size);
> +    sec_size = FFMIN(sec_size, max_init_section_size);
> +    av_fast_malloc(&pls->init_sec_buf, &pls->init_sec_buf_size, sec_size);
> +    ret = read_from_url(pls, pls->init_section, pls->init_sec_buf, pls->init_sec_buf_size, READ_COMPLETE);
> +    ff_format_io_close(pls->parent, &pls->input);
> +    if (ret < 0)
> +        return ret;
> +
> +    if (pls->fix_multiple_stsd_order && pls->rep_idx > 0) {
> +        uint8_t **stsd_entries = NULL;
> +        int *stsd_entries_size = NULL;
> +        int i = 4;
> +
> +        while (i <= (ret - 4)) {
> +            // find start stsd atom
> +            if (!memcmp(pls->init_sec_buf + i, "stsd", 4)) {
> +                /* 1B version
> +                 * 3B flags
> +                 * 4B num of entries */
> +                int stsd_first_offset = i + 8;
> +                int stsd_offset = 0;
> +                int j = 0;
> +                uint32_t stsd_count = AV_RB32(pls->init_sec_buf + stsd_first_offset);
> +                stsd_first_offset += 4;
> +                if (stsd_count != pls->rep_count) {
> +                    i++;
> +                    continue;
> +                }
> +                // find all stsd entries
> +                stsd_entries = av_mallocz_array(stsd_count, sizeof(*stsd_entries));
> +                stsd_entries_size = av_mallocz_array(stsd_count, sizeof(*stsd_entries_size));
> +                for (j = 0; j < stsd_count; ++j) {
> +                    /* 4B - size
> +                     * 4B - format */
> +                    stsd_entries_size[j] = AV_RB32(pls->init_sec_buf + stsd_first_offset + stsd_offset);
> +                    stsd_entries[j] = av_malloc(stsd_entries_size[j]);
> +                    memcpy(stsd_entries[j], pls->init_sec_buf + stsd_first_offset + stsd_offset, stsd_entries_size[j]);
> +                    stsd_offset += stsd_entries_size[j];
> +                }
> +                // reorder stsd entries
> +                // as first put stsd entry for current representation
> +                j = pls->rep_idx;
> +                stsd_offset = stsd_first_offset;
> +                memcpy(pls->init_sec_buf + stsd_offset, stsd_entries[j], stsd_entries_size[j]);
> +                stsd_offset += stsd_entries_size[j];
> +                for (j = 0; j < stsd_count; ++j) {
> +                    if (j != pls->rep_idx) {
> +                        memcpy(pls->init_sec_buf + stsd_offset, stsd_entries[j], stsd_entries_size[j]);
> +                        stsd_offset += stsd_entries_size[j];
> +                    }
> +                    av_free(stsd_entries[j]);
> +                }
> +                av_freep(&stsd_entries);
> +                av_freep(&stsd_entries_size);
> +                break;
> +            }
> +            i++;
> +        }
> +    }
> +
> +    av_log(pls->parent, AV_LOG_TRACE, "pls[%p] init section size[%d]\n", pls, (int)ret);
> +    pls->init_sec_data_len = ret;
> +    pls->init_sec_buf_read_offset = 0;
> +
> +    return 0;
> +}
> +
> +static int64_t seek_data(void *opaque, int64_t offset, int whence)
> +{
> +    struct representation *v = opaque;
> +    if (v->n_fragments && !v->init_sec_data_len) {
> +        return avio_seek(v->input, offset, whence);
> +    }
> +
> +    return AVERROR(ENOSYS);
> +}
> +
> +static int read_data(void *opaque, uint8_t *buf, int buf_size)
> +{
> +    int ret = 0;
> +    struct representation *v = opaque;
> +    DASHContext *c = v->parent->priv_data;
> +
> +restart:
> +    if (!v->input) {
> +        free_fragment(&v->cur_seg);
> +        v->cur_seg = get_current_fragment(v);
> +        if (!v->cur_seg) {
> +            ret = AVERROR_EOF;
> +            goto end;
> +        }
> +
> +        /* load/update Media Initialization Section, if any */
> +        ret = update_init_section(v);
> +        if (ret)
> +            goto end;
> +
> +        ret = open_input(c, v, v->cur_seg);
> +        if (ret < 0) {
> +            if (ff_check_interrupt(c->interrupt_callback)) {
> +                goto end;
> +                ret = AVERROR_EXIT;
> +            }
> +            av_log(v->parent, AV_LOG_WARNING, "Failed to open fragment of playlist %d\n", v->rep_idx);
> +            v->cur_seq_no++;
> +            goto restart;
> +        }
> +    }
> +
> +    if (v->init_sec_buf_read_offset < v->init_sec_data_len) {
> +        /* Push init section out first before first actual fragment */
> +        int copy_size = FFMIN(v->init_sec_data_len - v->init_sec_buf_read_offset, buf_size);
> +        memcpy(buf, v->init_sec_buf, copy_size);
> +        v->init_sec_buf_read_offset += copy_size;
> +        ret = copy_size;
> +        goto end;
> +    }
> +
> +    /* check the v->cur_seg, if it is null, get current and double check if the new v->cur_seg*/
> +    if (!v->cur_seg) {
> +        v->cur_seg = get_current_fragment(v);
> +    }
> +    if (!v->cur_seg) {
> +        ret = AVERROR_EOF;
> +        goto end;
> +    }
> +    ret = read_from_url(v, v->cur_seg, buf, buf_size, READ_NORMAL);
> +    if (ret > 0)
> +        goto end;
> +    ff_format_io_close(v->parent, &v->input);
> +    v->cur_seq_no++;
> +    goto restart;
> +
> +end:
> +    return ret;
> +}
> +
> +static int save_avio_options(AVFormatContext *s)
> +{
> +    DASHContext *c = s->priv_data;
> +    const char *opts[] = { "headers", "user_agent", "user-agent", "cookies", NULL }, **opt = opts;
> +    uint8_t *buf = NULL;
> +    int ret = 0;
> +
> +    while (*opt) {
> +        if (av_opt_get(s->pb, *opt, AV_OPT_SEARCH_CHILDREN, &buf) >= 0) {
> +            if (buf[0] != '\0') {
> +                ret = av_dict_set(&c->avio_opts, *opt, buf, AV_DICT_DONT_STRDUP_VAL);
> +                if (ret < 0)
> +                    return ret;
> +            }
> +        }
> +        opt++;
> +    }
> +
> +    return ret;
> +}
> +
> +static int nested_io_open(AVFormatContext *s, AVIOContext **pb, const char *url,
> +                          int flags, AVDictionary **opts)
> +{
> +    av_log(s, AV_LOG_ERROR,
> +           "A HDS playlist item '%s' referred to an external file '%s'. "
"DASH" is clearer than "HDS" here.

> +           "Opening this file was forbidden for security reasons\n",
> +           s->filename, url);
> +    return AVERROR(EPERM);
> +}
> +
> +static int reopen_demux_for_component(AVFormatContext *s, struct representation *pls)
> +{
> +    DASHContext *c = s->priv_data;
> +    AVInputFormat *in_fmt = NULL;
> +    AVDictionary  *in_fmt_opts = NULL;
> +    uint8_t *avio_ctx_buffer  = NULL;
> +    int ret = 0;
> +
> +    if (pls->ctx) {
> +        /* note: the internal buffer could have changed, and be != avio_ctx_buffer */
> +        av_freep(&pls->pb.buffer);
> +        memset(&pls->pb, 0x00, sizeof(AVIOContext));
> +        pls->ctx->pb = NULL;
> +        avformat_close_input(&pls->ctx);
> +        pls->ctx = NULL;
> +    }
> +    if (!(pls->ctx = avformat_alloc_context())) {
> +        ret = AVERROR(ENOMEM);
> +        goto fail;
> +    }
> +
> +    avio_ctx_buffer  = av_malloc(INITIAL_BUFFER_SIZE);
> +    if (!avio_ctx_buffer ) {
> +        ret = AVERROR(ENOMEM);
> +        avformat_free_context(pls->ctx);
> +        pls->ctx = NULL;
> +        goto fail;
> +    }
> +    if (c->is_live) {
> +        ffio_init_context(&pls->pb, avio_ctx_buffer , INITIAL_BUFFER_SIZE, 0, pls, read_data, NULL, NULL);
> +    } else {
> +        ffio_init_context(&pls->pb, avio_ctx_buffer , INITIAL_BUFFER_SIZE, 0, pls, read_data, NULL, seek_data);
> +    }
> +    pls->pb.seekable = 0;
> +
> +    if ((ret = ff_copy_whiteblacklists(pls->ctx, s)) < 0)
> +        goto fail;
> +
> +    pls->ctx->flags = AVFMT_FLAG_CUSTOM_IO;
> +    pls->ctx->probesize = 1024 * 4;
> +    pls->ctx->max_analyze_duration = 4 * AV_TIME_BASE;
> +    ret = av_probe_input_buffer(&pls->pb, &in_fmt, "", NULL, 0, 0);
> +    if (ret < 0) {
> +        av_log(s, AV_LOG_ERROR, "Error when loading first fragment, playlist %d\n", (int)pls->rep_idx);
> +        avformat_free_context(pls->ctx);
> +        pls->ctx = NULL;
> +        goto fail;
> +    }
> +
> +    pls->ctx->pb = &pls->pb;
> +    pls->ctx->io_open  = nested_io_open;
> +
> +    // provide additional information from mpd if available
> +    ret = avformat_open_input(&pls->ctx, "", in_fmt, &in_fmt_opts); //pls->init_section->url
> +    av_dict_free(&in_fmt_opts);
> +    if (ret < 0)
> +        goto fail;
> +    if (pls->n_fragments) {
> +        ret = avformat_find_stream_info(pls->ctx, NULL);
> +        if (ret < 0)
> +            goto fail;
> +    }
> +
> +fail:
> +    return ret;
> +}
> +
> +static int open_demux_for_component(AVFormatContext *s, struct representation *pls)
> +{
> +    int ret = 0;
> +    int i;
> +
> +    pls->parent = s;
> +    pls->cur_seq_no  = calc_cur_seg_no(s, pls);
> +    pls->last_seq_no = calc_max_seg_no(s, pls);
> +
> +    ret = reopen_demux_for_component(s, pls);
> +    if (ret < 0) {
> +        goto fail;
> +    }
> +    for (i = 0; i < pls->ctx->nb_streams; i++) {
> +        AVStream *st = avformat_new_stream(s, NULL);
> +        AVStream *ist = pls->ctx->streams[i];
> +        if (!st) {
> +            ret = AVERROR(ENOMEM);
> +            goto fail;
> +        }
> +        st->id = i;
> +        avcodec_parameters_copy(st->codecpar, pls->ctx->streams[i]->codecpar);
> +        avpriv_set_pts_info(st, ist->pts_wrap_bits, ist->time_base.num, ist->time_base.den);
> +    }
> +
> +    return 0;
> +fail:
> +    return ret;
> +}
> +
> +static int dash_read_header(AVFormatContext *s)
> +{
> +    void *u = (s->flags & AVFMT_FLAG_CUSTOM_IO) ? NULL : s->pb;
> +    DASHContext *c = s->priv_data;
> +    int ret = 0;
> +    int stream_index = 0;
> +
> +    c->interrupt_callback = &s->interrupt_callback;
> +    // if the URL context is good, read important options we must broker later
> +    if (u) {
> +        update_options(&c->user_agent, "user-agent", u);
> +        update_options(&c->cookies, "cookies", u);
> +        update_options(&c->headers, "headers", u);
> +    }
> +
> +    if ((ret = parse_manifest(s, s->filename, s->pb)) < 0)
> +        goto fail;
> +
> +    if ((ret = save_avio_options(s)) < 0)
> +        goto fail;
> +
> +    /* If this isn't a live stream, fill the total duration of the
> +     * stream. */
> +    if (!c->is_live) {
> +        s->duration = (int64_t) c->media_presentation_duration_sec * AV_TIME_BASE;
> +    }
> +
> +    /* Open the demuxer for curent video and current audio components if available */
> +    if (!ret && c->cur_video) {
> +        ret = open_demux_for_component(s, c->cur_video);
> +        if (!ret) {
> +            c->cur_video->stream_index = stream_index;
> +            ++stream_index;
> +        } else {
> +            free_representation(c->cur_video);
> +            c->cur_video = NULL;
> +        }
> +    }
> +
> +    if (!ret && c->cur_audio) {
> +        ret = open_demux_for_component(s, c->cur_audio);
> +        if (!ret) {
> +            c->cur_audio->stream_index = stream_index;
> +            ++stream_index;
> +        } else {
> +            free_representation(c->cur_audio);
> +            c->cur_audio = NULL;
> +        }
> +    }
> +
> +    if (!stream_index) {
> +        ret = AVERROR_INVALIDDATA;
> +        goto fail;
> +    }
> +
> +    /* Create a program */
> +    if (!ret) {
> +        AVProgram *program;
> +        program = av_new_program(s, 0);
> +        if (!program) {
> +            goto fail;
> +        }
> +
> +        if (c->cur_video) {
> +            av_program_add_stream_index(s, 0, c->cur_video->stream_index);
> +        }
> +
> +        if (c->cur_audio) {
> +            av_program_add_stream_index(s, 0, c->cur_audio->stream_index);
> +        }
> +    }
> +
> +    return 0;
> +fail:
> +    return ret;
> +}
> +
> +static int dash_read_packet(AVFormatContext *s, AVPacket *pkt)
> +{
> +    DASHContext *c = s->priv_data;
> +    int ret = 0;
> +    struct representation *cur = NULL;
> +
> +    if (!c->cur_audio && !c->cur_video) {
> +        return AVERROR_INVALIDDATA;
> +    }
> +    if (c->cur_audio && !c->cur_video) {
> +        cur = c->cur_audio;
> +    } else if (!c->cur_audio && c->cur_video) {
> +        cur = c->cur_video;
> +    } else if (c->cur_video->cur_timestamp < c->cur_audio->cur_timestamp) {
> +        cur = c->cur_video;
> +    } else {
> +        cur = c->cur_audio;
> +    }
> +
> +    if (cur->ctx) {
> +        ret = av_read_frame(cur->ctx, &cur->pkt);
Just read directly into the user-provided pkt. There's no need to keep the state around, since it's only referenced from this function.

> +        if (ret < 0) {
> +            av_packet_unref(&cur->pkt);
> +        } else {
> +            /* If we got a packet, return it */
> +            *pkt = cur->pkt;
> +            cur->cur_timestamp = av_rescale(pkt->pts, (int64_t)cur->ctx->streams[0]->time_base.num * 90000, cur->ctx->streams[0]->time_base.den);
> +            pkt->stream_index = cur->stream_index;
> +            reset_packet(&cur->pkt);
> +            return 0;
> +        }
> +    }
> +    return AVERROR_EOF;
> +}
> +
> +static int dash_close(AVFormatContext *s)
> +{
> +    DASHContext *c = s->priv_data;
> +
> +    if (c->cur_audio) {
> +        free_representation(c->cur_audio);
> +    }
> +
> +    if (c->cur_video) {
> +        free_representation(c->cur_video);
> +    }
> +
> +    av_freep(&c->cookies);
> +    av_freep(&c->user_agent);
> +    av_dict_free(&c->avio_opts);
> +    av_freep(&c->base_url);
> +    return 0;
> +}
> +
> +static int dash_seek(AVFormatContext *s, struct representation *pls, int64_t seek_pos_msec, int flags)
> +{
> +    int ret = 0;
> +    int i = 0;
> +    int j = 0;
> +    int64_t duration = 0;
> +
> +    av_log(pls->parent, AV_LOG_VERBOSE, "DASH seek pos[%"PRId64"ms], playlist %d\n", seek_pos_msec, pls->rep_idx);
> +
> +    // single fragment mode
> +    if (pls->n_fragments == 1) {
> +        pls->cur_timestamp = 0;
> +        pls->cur_seg_offset = 0;
> +        ff_read_frame_flush(pls->ctx);
> +        return av_seek_frame(pls->ctx, -1, seek_pos_msec*1000, flags);
> +    }
> +
> +    if (pls->input)
> +        ff_format_io_close(pls->parent, &pls->input);
> +
> +    // find the nearest fragment
> +    if (pls->n_timelines > 0 && pls->fragment_timescale > 0) {
> +        int64_t num = pls->first_seq_no;
> +        av_log(pls->parent, AV_LOG_VERBOSE, "dash_seek with SegmentTimeline start n_timelines[%d] last_seq_no[%"PRId64"], playlist %d.\n",
> +               (int)pls->n_timelines, (int64_t)pls->last_seq_no, (int)pls->rep_idx);
> +        for (i = 0; i < pls->n_timelines; i++) {
> +            if (pls->timelines[i]->t > 0) {
> +                duration = pls->timelines[i]->t;
> +            }
> +            duration += pls->timelines[i]->d;
> +            if (seek_pos_msec < ((duration * 1000) /  pls->fragment_timescale)) {
> +                goto set_seq_num;
> +            }
> +            for (j = 0; j < pls->timelines[i]->r; j++) {
> +                duration += pls->timelines[i]->d;
> +                num++;
> +                if (seek_pos_msec < ((duration * 1000) /  pls->fragment_timescale)) {
> +                    goto set_seq_num;
> +                }
> +            }
> +            num++;
> +        }
> +
> +set_seq_num:
> +        pls->cur_seq_no = num > pls->last_seq_no ? pls->last_seq_no : num;
> +        av_log(pls->parent, AV_LOG_VERBOSE, "dash_seek with SegmentTimeline end cur_seq_no[%"PRId64"], playlist %d.\n",
> +               (int64_t)pls->cur_seq_no, (int)pls->rep_idx);
> +    } else if (pls->fragment_duration > 0) {
> +        pls->cur_seq_no = pls->first_seq_no + ((seek_pos_msec * pls->fragment_timescale) / pls->fragment_duration) / 1000;
> +    } else {
> +        av_log(pls->parent, AV_LOG_ERROR, "dash_seek missing fragment_duration\n");
> +        pls->cur_seq_no = pls->first_seq_no;
> +    }
> +    pls->cur_timestamp = 0;
> +    pls->cur_seg_offset = 0;
> +    pls->init_sec_buf_read_offset = 0;
> +    ret = reopen_demux_for_component(s, pls);
> +
> +    return ret;
> +}
> +
> +static int dash_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
> +{
> +    int ret = 0;
> +    DASHContext *c = s->priv_data;
> +    int64_t seek_pos_msec = av_rescale_rnd(timestamp, 1000,
> +                                           s->streams[stream_index]->time_base.den,
> +                                           flags & AVSEEK_FLAG_BACKWARD ?
> +                                           AV_ROUND_DOWN : AV_ROUND_UP);
> +    if ((flags & AVSEEK_FLAG_BYTE) || c->is_live)
> +        return AVERROR(ENOSYS);
> +    if (c->cur_audio) {
> +        ret = dash_seek(s, c->cur_audio, seek_pos_msec, flags);
> +    }
> +    if (!ret && c->cur_video) {
> +        ret = dash_seek(s, c->cur_video, seek_pos_msec, flags);
> +    }
> +    return ret;
> +}
> +
> +static int dash_probe(AVProbeData *p)
> +{
> +    if (!av_stristr(p->buf, "<MPD"))
> +        return 0;
> +
> +    if (av_stristr(p->buf, "dash:profile:isoff-on-demand:2011") ||
> +        av_stristr(p->buf, "dash:profile:isoff-live:2011") ||
> +        av_stristr(p->buf, "dash:profile:isoff-live:2012") ||
> +        av_stristr(p->buf, "dash:profile:isoff-main:2011")) {
> +        return AVPROBE_SCORE_MAX;
> +    }
> +    if (av_stristr(p->buf, "dash:profile")) {
> +        return AVPROBE_SCORE_MAX >> 1;
The common practice is to use "/ 2" here instead of ">> 1".

> +    }
> +
> +    return 0;
> +}
> +
> +#define OFFSET(x) offsetof(DASHContext, x)
> +#define FLAGS AV_OPT_FLAG_DECODING_PARAM
> +static const AVOption dash_options[] = {
> +    {NULL}
> +};
> +
> +static const AVClass dash_class = {
> +    .class_name = "dash",
> +    .item_name  = av_default_item_name,
> +    .option     = dash_options,
> +    .version    = LIBAVUTIL_VERSION_INT,
> +};
> +
> +AVInputFormat ff_dash_demuxer = {
> +    .name           = "dash",
> +    .long_name      = NULL_IF_CONFIG_SMALL("Dynamic Adaptive Streaming over HTTP"),
> +    .priv_class     = &dash_class,
> +    .priv_data_size = sizeof(DASHContext),
> +    .read_probe     = dash_probe,
> +    .read_header    = dash_read_header,
> +    .read_packet    = dash_read_packet,
> +    .read_close     = dash_close,
> +    .read_seek      = dash_read_seek,
> +    .flags          = AVFMT_NO_BYTE_SEEK,
> +};
> -- 
> 2.11.0 (Apple Git-81)
> 
> 
> 
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