FFmpeg: libavformat/asfdec.c Source File

00001 /*
00002  * ASF compatible demuxer
00003  * Copyright (c) 2000, 2001 Fabrice Bellard
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * FFmpeg is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with FFmpeg; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00022 //#define DEBUG
00023 
00024 #include "libavutil/attributes.h"
00025 #include "libavutil/bswap.h"
00026 #include "libavutil/common.h"
00027 #include "libavutil/avstring.h"
00028 #include "libavutil/dict.h"
00029 #include "libavutil/mathematics.h"
00030 #include "libavutil/opt.h"
00031 #include "avformat.h"
00032 #include "internal.h"
00033 #include "avio_internal.h"
00034 #include "id3v2.h"
00035 #include "riff.h"
00036 #include "asf.h"
00037 #include "asfcrypt.h"
00038 #include "avlanguage.h"
00039 
00040 typedef struct {
00041     const AVClass *class;
00042     int asfid2avid[128];                 
00043     ASFStream streams[128];              
00044     uint32_t stream_bitrates[128];       
00045     AVRational dar[128];
00046     char stream_languages[128][6];       
00047     /* non streamed additonnal info */
00048     /* packet filling */
00049     int packet_size_left;
00050     /* only for reading */
00051     uint64_t data_offset;                
00052     uint64_t data_object_offset;         
00053     uint64_t data_object_size;           
00054     int index_read;
00055 
00056     ASFMainHeader hdr;
00057 
00058     int packet_flags;
00059     int packet_property;
00060     int packet_timestamp;
00061     int packet_segsizetype;
00062     int packet_segments;
00063     int packet_seq;
00064     int packet_replic_size;
00065     int packet_key_frame;
00066     int packet_padsize;
00067     unsigned int packet_frag_offset;
00068     unsigned int packet_frag_size;
00069     int64_t packet_frag_timestamp;
00070     int packet_multi_size;
00071     int packet_obj_size;
00072     int packet_time_delta;
00073     int packet_time_start;
00074     int64_t packet_pos;
00075 
00076     int stream_index;
00077 
00078     ASFStream* asf_st;                   
00079 
00080     int no_resync_search;
00081 } ASFContext;
00082 
00083 static const AVOption options[] = {
00084     {"no_resync_search", "Don't try to resynchronize by looking for a certain optional start code", offsetof(ASFContext, no_resync_search), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
00085     { NULL },
00086 };
00087 
00088 static const AVClass asf_class = {
00089     .class_name = "asf demuxer",
00090     .item_name  = av_default_item_name,
00091     .option     = options,
00092     .version    = LIBAVUTIL_VERSION_INT,
00093 };
00094 
00095 #undef NDEBUG
00096 #include <assert.h>
00097 
00098 #define ASF_MAX_STREAMS 127
00099 #define FRAME_HEADER_SIZE 16
00100 // Fix Me! FRAME_HEADER_SIZE may be different. (17 is known to be too large)
00101 
00102 #ifdef DEBUG
00103 static const ff_asf_guid stream_bitrate_guid = { /* (http://get.to/sdp) */
00104     0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2
00105 };
00106 
00107 #define PRINT_IF_GUID(g,cmp) \
00108 if (!ff_guidcmp(g, &cmp)) \
00109     av_dlog(NULL, "(GUID: %s) ", #cmp)
00110 
00111 static void print_guid(const ff_asf_guid *g)
00112 {
00113     int i;
00114     PRINT_IF_GUID(g, ff_asf_header);
00115     else PRINT_IF_GUID(g, ff_asf_file_header);
00116     else PRINT_IF_GUID(g, ff_asf_stream_header);
00117     else PRINT_IF_GUID(g, ff_asf_audio_stream);
00118     else PRINT_IF_GUID(g, ff_asf_audio_conceal_none);
00119     else PRINT_IF_GUID(g, ff_asf_video_stream);
00120     else PRINT_IF_GUID(g, ff_asf_video_conceal_none);
00121     else PRINT_IF_GUID(g, ff_asf_command_stream);
00122     else PRINT_IF_GUID(g, ff_asf_comment_header);
00123     else PRINT_IF_GUID(g, ff_asf_codec_comment_header);
00124     else PRINT_IF_GUID(g, ff_asf_codec_comment1_header);
00125     else PRINT_IF_GUID(g, ff_asf_data_header);
00126     else PRINT_IF_GUID(g, ff_asf_simple_index_header);
00127     else PRINT_IF_GUID(g, ff_asf_head1_guid);
00128     else PRINT_IF_GUID(g, ff_asf_head2_guid);
00129     else PRINT_IF_GUID(g, ff_asf_my_guid);
00130     else PRINT_IF_GUID(g, ff_asf_ext_stream_header);
00131     else PRINT_IF_GUID(g, ff_asf_extended_content_header);
00132     else PRINT_IF_GUID(g, ff_asf_ext_stream_embed_stream_header);
00133     else PRINT_IF_GUID(g, ff_asf_ext_stream_audio_stream);
00134     else PRINT_IF_GUID(g, ff_asf_metadata_header);
00135     else PRINT_IF_GUID(g, ff_asf_marker_header);
00136     else PRINT_IF_GUID(g, stream_bitrate_guid);
00137     else PRINT_IF_GUID(g, ff_asf_language_guid);
00138     else
00139         av_dlog(NULL, "(GUID: unknown) ");
00140     for(i=0;i<16;i++)
00141         av_dlog(NULL, " 0x%02x,", (*g)[i]);
00142     av_dlog(NULL, "}\n");
00143 }
00144 #undef PRINT_IF_GUID
00145 #else
00146 #define print_guid(g)
00147 #endif
00148 
00149 static int asf_probe(AVProbeData *pd)
00150 {
00151     /* check file header */
00152     if (!ff_guidcmp(pd->buf, &ff_asf_header))
00153         return AVPROBE_SCORE_MAX;
00154     else
00155         return 0;
00156 }
00157 
00158 static int get_value(AVIOContext *pb, int type){
00159     switch(type){
00160         case 2: return avio_rl32(pb);
00161         case 3: return avio_rl32(pb);
00162         case 4: return avio_rl64(pb);
00163         case 5: return avio_rl16(pb);
00164         default:return INT_MIN;
00165     }
00166 }
00167 
00168 /* MSDN claims that this should be "compatible with the ID3 frame, APIC",
00169  * but in reality this is only loosely similar */
00170 static int asf_read_picture(AVFormatContext *s, int len)
00171 {
00172     AVPacket pkt = { 0 };
00173     const CodecMime *mime = ff_id3v2_mime_tags;
00174     enum  AVCodecID      id = AV_CODEC_ID_NONE;
00175     char mimetype[64];
00176     uint8_t  *desc = NULL;
00177     ASFStream *ast = NULL;
00178     AVStream   *st = NULL;
00179     int ret, type, picsize, desc_len;
00180 
00181     /* type + picsize + mime + desc */
00182     if (len < 1 + 4 + 2 + 2) {
00183         av_log(s, AV_LOG_ERROR, "Invalid attached picture size: %d.\n", len);
00184         return AVERROR_INVALIDDATA;
00185     }
00186 
00187     /* picture type */
00188     type = avio_r8(s->pb);
00189     len--;
00190     if (type >= FF_ARRAY_ELEMS(ff_id3v2_picture_types) || type < 0) {
00191         av_log(s, AV_LOG_WARNING, "Unknown attached picture type: %d.\n", type);
00192         type = 0;
00193     }
00194 
00195     /* picture data size */
00196     picsize = avio_rl32(s->pb);
00197     len -= 4;
00198 
00199     /* picture MIME type */
00200     len -= avio_get_str16le(s->pb, len, mimetype, sizeof(mimetype));
00201     while (mime->id != AV_CODEC_ID_NONE) {
00202         if (!strncmp(mime->str, mimetype, sizeof(mimetype))) {
00203             id = mime->id;
00204             break;
00205         }
00206         mime++;
00207     }
00208     if (id == AV_CODEC_ID_NONE) {
00209         av_log(s, AV_LOG_ERROR, "Unknown attached picture mimetype: %s.\n",
00210                mimetype);
00211         return 0;
00212     }
00213 
00214     if (picsize >= len) {
00215         av_log(s, AV_LOG_ERROR, "Invalid attached picture data size: %d >= %d.\n",
00216                picsize, len);
00217         return AVERROR_INVALIDDATA;
00218     }
00219 
00220     /* picture description */
00221     desc_len = (len - picsize) * 2 + 1;
00222     desc     = av_malloc(desc_len);
00223     if (!desc)
00224         return AVERROR(ENOMEM);
00225     len -= avio_get_str16le(s->pb, len - picsize, desc, desc_len);
00226 
00227     ret = av_get_packet(s->pb, &pkt, picsize);
00228     if (ret < 0)
00229         goto fail;
00230 
00231     st = avformat_new_stream(s, NULL);
00232     ast = av_mallocz(sizeof(*ast));
00233     if (!st || !ast) {
00234         ret = AVERROR(ENOMEM);
00235         goto fail;
00236     }
00237     st->priv_data = ast;
00238 
00239     st->disposition      |= AV_DISPOSITION_ATTACHED_PIC;
00240     st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
00241     st->codec->codec_id   = id;
00242 
00243     st->attached_pic      = pkt;
00244     st->attached_pic.stream_index = st->index;
00245     st->attached_pic.flags |= AV_PKT_FLAG_KEY;
00246 
00247     if (*desc)
00248         av_dict_set(&st->metadata, "title", desc, AV_DICT_DONT_STRDUP_VAL);
00249     else
00250         av_freep(&desc);
00251 
00252     av_dict_set(&st->metadata, "comment", ff_id3v2_picture_types[type], 0);
00253 
00254     return 0;
00255 
00256 fail:
00257     av_freep(&ast);
00258     av_freep(&desc);
00259     av_free_packet(&pkt);
00260     return ret;
00261 }
00262 
00263 static void get_tag(AVFormatContext *s, const char *key, int type, int len)
00264 {
00265     char *value;
00266     int64_t off = avio_tell(s->pb);
00267 
00268     if ((unsigned)len >= (UINT_MAX - 1)/2)
00269         return;
00270 
00271     value = av_malloc(2*len+1);
00272     if (!value)
00273         goto finish;
00274 
00275     if (type == 0) {         // UTF16-LE
00276         avio_get_str16le(s->pb, len, value, 2*len + 1);
00277     } else if (type == -1) { // ASCII
00278         avio_read(s->pb, value, len);
00279         value[len]=0;
00280     } else if (type > 1 && type <= 5) {  // boolean or DWORD or QWORD or WORD
00281         uint64_t num = get_value(s->pb, type);
00282         snprintf(value, len, "%"PRIu64, num);
00283     } else if (type == 1 && !strcmp(key, "WM/Picture")) { // handle cover art
00284         asf_read_picture(s, len);
00285         goto finish;
00286     } else {
00287         av_log(s, AV_LOG_DEBUG, "Unsupported value type %d in tag %s.\n", type, key);
00288         goto finish;
00289     }
00290     if (*value)
00291         av_dict_set(&s->metadata, key, value, 0);
00292 finish:
00293     av_freep(&value);
00294     avio_seek(s->pb, off + len, SEEK_SET);
00295 }
00296 
00297 static int asf_read_file_properties(AVFormatContext *s, int64_t size)
00298 {
00299     ASFContext *asf = s->priv_data;
00300     AVIOContext *pb = s->pb;
00301 
00302     ff_get_guid(pb, &asf->hdr.guid);
00303     asf->hdr.file_size          = avio_rl64(pb);
00304     asf->hdr.create_time        = avio_rl64(pb);
00305     avio_rl64(pb);                               /* number of packets */
00306     asf->hdr.play_time          = avio_rl64(pb);
00307     asf->hdr.send_time          = avio_rl64(pb);
00308     asf->hdr.preroll            = avio_rl32(pb);
00309     asf->hdr.ignore             = avio_rl32(pb);
00310     asf->hdr.flags              = avio_rl32(pb);
00311     asf->hdr.min_pktsize        = avio_rl32(pb);
00312     asf->hdr.max_pktsize        = avio_rl32(pb);
00313     if (asf->hdr.min_pktsize >= (1U<<29))
00314         return AVERROR_INVALIDDATA;
00315     asf->hdr.max_bitrate        = avio_rl32(pb);
00316     s->packet_size = asf->hdr.max_pktsize;
00317 
00318     return 0;
00319 }
00320 
00321 static int asf_read_stream_properties(AVFormatContext *s, int64_t size)
00322 {
00323     ASFContext *asf = s->priv_data;
00324     AVIOContext *pb = s->pb;
00325     AVStream *st;
00326     ASFStream *asf_st;
00327     ff_asf_guid g;
00328     enum AVMediaType type;
00329     int type_specific_size, sizeX;
00330     unsigned int tag1;
00331     int64_t pos1, pos2, start_time;
00332     int test_for_ext_stream_audio, is_dvr_ms_audio=0;
00333 
00334     if (s->nb_streams == ASF_MAX_STREAMS) {
00335         av_log(s, AV_LOG_ERROR, "too many streams\n");
00336         return AVERROR(EINVAL);
00337     }
00338 
00339     pos1 = avio_tell(pb);
00340 
00341     st = avformat_new_stream(s, NULL);
00342     if (!st)
00343         return AVERROR(ENOMEM);
00344     avpriv_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
00345     asf_st = av_mallocz(sizeof(ASFStream));
00346     if (!asf_st)
00347         return AVERROR(ENOMEM);
00348     st->priv_data = asf_st;
00349     start_time = asf->hdr.preroll;
00350 
00351     asf_st->stream_language_index = 128; // invalid stream index means no language info
00352 
00353     if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
00354         int64_t fsize = avio_size(pb);
00355         if (fsize <= 0 || (int64_t)asf->hdr.file_size <= 0 || FFABS(fsize - (int64_t)asf->hdr.file_size) < 10000)
00356             st->duration = asf->hdr.play_time /
00357                 (10000000 / 1000) - start_time;
00358     }
00359     ff_get_guid(pb, &g);
00360 
00361     test_for_ext_stream_audio = 0;
00362     if (!ff_guidcmp(&g, &ff_asf_audio_stream)) {
00363         type = AVMEDIA_TYPE_AUDIO;
00364     } else if (!ff_guidcmp(&g, &ff_asf_video_stream)) {
00365         type = AVMEDIA_TYPE_VIDEO;
00366     } else if (!ff_guidcmp(&g, &ff_asf_jfif_media)) {
00367         type = AVMEDIA_TYPE_VIDEO;
00368         st->codec->codec_id = AV_CODEC_ID_MJPEG;
00369     } else if (!ff_guidcmp(&g, &ff_asf_command_stream)) {
00370         type = AVMEDIA_TYPE_DATA;
00371     } else if (!ff_guidcmp(&g, &ff_asf_ext_stream_embed_stream_header)) {
00372         test_for_ext_stream_audio = 1;
00373         type = AVMEDIA_TYPE_UNKNOWN;
00374     } else {
00375         return -1;
00376     }
00377     ff_get_guid(pb, &g);
00378     avio_skip(pb, 8); /* total_size */
00379     type_specific_size = avio_rl32(pb);
00380     avio_rl32(pb);
00381     st->id = avio_rl16(pb) & 0x7f; /* stream id */
00382     // mapping of asf ID to AV stream ID;
00383     asf->asfid2avid[st->id] = s->nb_streams - 1;
00384 
00385     avio_rl32(pb);
00386 
00387     if (test_for_ext_stream_audio) {
00388         ff_get_guid(pb, &g);
00389         if (!ff_guidcmp(&g, &ff_asf_ext_stream_audio_stream)) {
00390             type = AVMEDIA_TYPE_AUDIO;
00391             is_dvr_ms_audio=1;
00392             ff_get_guid(pb, &g);
00393             avio_rl32(pb);
00394             avio_rl32(pb);
00395             avio_rl32(pb);
00396             ff_get_guid(pb, &g);
00397             avio_rl32(pb);
00398         }
00399     }
00400 
00401     st->codec->codec_type = type;
00402     if (type == AVMEDIA_TYPE_AUDIO) {
00403         int ret = ff_get_wav_header(pb, st->codec, type_specific_size);
00404         if (ret < 0)
00405             return ret;
00406         if (is_dvr_ms_audio) {
00407             // codec_id and codec_tag are unreliable in dvr_ms
00408             // files. Set them later by probing stream.
00409             st->request_probe= 1;
00410             st->codec->codec_tag = 0;
00411         }
00412         if (st->codec->codec_id == AV_CODEC_ID_AAC) {
00413             st->need_parsing = AVSTREAM_PARSE_NONE;
00414         } else {
00415             st->need_parsing = AVSTREAM_PARSE_FULL;
00416         }
00417         /* We have to init the frame size at some point .... */
00418         pos2 = avio_tell(pb);
00419         if (size >= (pos2 + 8 - pos1 + 24)) {
00420             asf_st->ds_span = avio_r8(pb);
00421             asf_st->ds_packet_size = avio_rl16(pb);
00422             asf_st->ds_chunk_size = avio_rl16(pb);
00423             avio_rl16(pb); //ds_data_size
00424             avio_r8(pb);   //ds_silence_data
00425         }
00426         if (asf_st->ds_span > 1) {
00427             if (!asf_st->ds_chunk_size
00428                     || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1)
00429                     || asf_st->ds_packet_size % asf_st->ds_chunk_size)
00430                 asf_st->ds_span = 0; // disable descrambling
00431         }
00432     } else if (type == AVMEDIA_TYPE_VIDEO &&
00433             size - (avio_tell(pb) - pos1 + 24) >= 51) {
00434         avio_rl32(pb);
00435         avio_rl32(pb);
00436         avio_r8(pb);
00437         avio_rl16(pb);        /* size */
00438         sizeX= avio_rl32(pb); /* size */
00439         st->codec->width = avio_rl32(pb);
00440         st->codec->height = avio_rl32(pb);
00441         /* not available for asf */
00442         avio_rl16(pb); /* panes */
00443         st->codec->bits_per_coded_sample = avio_rl16(pb); /* depth */
00444         tag1 = avio_rl32(pb);
00445         avio_skip(pb, 20);
00446         if (sizeX > 40) {
00447             st->codec->extradata_size = ffio_limit(pb, sizeX - 40);
00448             st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
00449             avio_read(pb, st->codec->extradata, st->codec->extradata_size);
00450         }
00451 
00452         /* Extract palette from extradata if bpp <= 8 */
00453         /* This code assumes that extradata contains only palette */
00454         /* This is true for all paletted codecs implemented in libavcodec */
00455         if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
00456 #if HAVE_BIGENDIAN
00457             int i;
00458             for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
00459                 asf_st->palette[i] = av_bswap32(((uint32_t*)st->codec->extradata)[i]);
00460 #else
00461             memcpy(asf_st->palette, st->codec->extradata,
00462                    FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
00463 #endif
00464             asf_st->palette_changed = 1;
00465         }
00466 
00467         st->codec->codec_tag = tag1;
00468         st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
00469         if(tag1 == MKTAG('D', 'V', 'R', ' ')){
00470             st->need_parsing = AVSTREAM_PARSE_FULL;
00471             // issue658 containse wrong w/h and MS even puts a fake seq header with wrong w/h in extradata while a correct one is in te stream. maximum lameness
00472             st->codec->width  =
00473                 st->codec->height = 0;
00474             av_freep(&st->codec->extradata);
00475             st->codec->extradata_size=0;
00476         }
00477         if(st->codec->codec_id == AV_CODEC_ID_H264)
00478             st->need_parsing = AVSTREAM_PARSE_FULL_ONCE;
00479     }
00480     pos2 = avio_tell(pb);
00481     avio_skip(pb, size - (pos2 - pos1 + 24));
00482 
00483     return 0;
00484 }
00485 
00486 static int asf_read_ext_stream_properties(AVFormatContext *s, int64_t size)
00487 {
00488     ASFContext *asf = s->priv_data;
00489     AVIOContext *pb = s->pb;
00490     ff_asf_guid g;
00491     int ext_len, payload_ext_ct, stream_ct, i;
00492     uint32_t leak_rate, stream_num;
00493     unsigned int stream_languageid_index;
00494 
00495     avio_rl64(pb); // starttime
00496     avio_rl64(pb); // endtime
00497     leak_rate = avio_rl32(pb); // leak-datarate
00498     avio_rl32(pb); // bucket-datasize
00499     avio_rl32(pb); // init-bucket-fullness
00500     avio_rl32(pb); // alt-leak-datarate
00501     avio_rl32(pb); // alt-bucket-datasize
00502     avio_rl32(pb); // alt-init-bucket-fullness
00503     avio_rl32(pb); // max-object-size
00504     avio_rl32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
00505     stream_num = avio_rl16(pb); // stream-num
00506 
00507     stream_languageid_index = avio_rl16(pb); // stream-language-id-index
00508     if (stream_num < 128)
00509         asf->streams[stream_num].stream_language_index = stream_languageid_index;
00510 
00511     avio_rl64(pb); // avg frametime in 100ns units
00512     stream_ct = avio_rl16(pb); //stream-name-count
00513     payload_ext_ct = avio_rl16(pb); //payload-extension-system-count
00514 
00515     if (stream_num < 128) {
00516         asf->stream_bitrates[stream_num] = leak_rate;
00517         asf->streams[stream_num].payload_ext_ct = 0;
00518     }
00519 
00520     for (i=0; i<stream_ct; i++){
00521         avio_rl16(pb);
00522         ext_len = avio_rl16(pb);
00523         avio_skip(pb, ext_len);
00524     }
00525 
00526     for (i=0; i<payload_ext_ct; i++){
00527         int size;
00528         ff_get_guid(pb, &g);
00529         size = avio_rl16(pb);
00530         ext_len=avio_rl32(pb);
00531         avio_skip(pb, ext_len);
00532         if (stream_num < 128 && i < FF_ARRAY_ELEMS(asf->streams[stream_num].payload)) {
00533             ASFPayload *p = &asf->streams[stream_num].payload[i];
00534             p->type = g[0];
00535             p->size = size;
00536             av_log(s, AV_LOG_DEBUG, "Payload extension %x %d\n", g[0], p->size );
00537             asf->streams[stream_num].payload_ext_ct ++;
00538         }
00539     }
00540 
00541     return 0;
00542 }
00543 
00544 static int asf_read_content_desc(AVFormatContext *s, int64_t size)
00545 {
00546     AVIOContext *pb = s->pb;
00547     int len1, len2, len3, len4, len5;
00548 
00549     len1 = avio_rl16(pb);
00550     len2 = avio_rl16(pb);
00551     len3 = avio_rl16(pb);
00552     len4 = avio_rl16(pb);
00553     len5 = avio_rl16(pb);
00554     get_tag(s, "title"    , 0, len1);
00555     get_tag(s, "author"   , 0, len2);
00556     get_tag(s, "copyright", 0, len3);
00557     get_tag(s, "comment"  , 0, len4);
00558     avio_skip(pb, len5);
00559 
00560     return 0;
00561 }
00562 
00563 static int asf_read_ext_content_desc(AVFormatContext *s, int64_t size)
00564 {
00565     AVIOContext *pb = s->pb;
00566     ASFContext *asf = s->priv_data;
00567     int desc_count, i, ret;
00568 
00569     desc_count = avio_rl16(pb);
00570     for(i=0;i<desc_count;i++) {
00571         int name_len,value_type,value_len;
00572         char name[1024];
00573 
00574         name_len = avio_rl16(pb);
00575         if (name_len%2)     // must be even, broken lavf versions wrote len-1
00576             name_len += 1;
00577         if ((ret = avio_get_str16le(pb, name_len, name, sizeof(name))) < name_len)
00578             avio_skip(pb, name_len - ret);
00579         value_type = avio_rl16(pb);
00580         value_len  = avio_rl16(pb);
00581         if (!value_type && value_len%2)
00582             value_len += 1;
00587         if (!strcmp(name, "AspectRatioX")){
00588             asf->dar[0].num= get_value(s->pb, value_type);
00589         } else if(!strcmp(name, "AspectRatioY")){
00590             asf->dar[0].den= get_value(s->pb, value_type);
00591         } else
00592             get_tag(s, name, value_type, value_len);
00593     }
00594 
00595     return 0;
00596 }
00597 
00598 static int asf_read_language_list(AVFormatContext *s, int64_t size)
00599 {
00600     AVIOContext *pb = s->pb;
00601     ASFContext *asf = s->priv_data;
00602     int j, ret;
00603     int stream_count = avio_rl16(pb);
00604     for(j = 0; j < stream_count; j++) {
00605         char lang[6];
00606         unsigned int lang_len = avio_r8(pb);
00607         if ((ret = avio_get_str16le(pb, lang_len, lang, sizeof(lang))) < lang_len)
00608             avio_skip(pb, lang_len - ret);
00609         if (j < 128)
00610             av_strlcpy(asf->stream_languages[j], lang, sizeof(*asf->stream_languages));
00611     }
00612 
00613     return 0;
00614 }
00615 
00616 static int asf_read_metadata(AVFormatContext *s, int64_t size)
00617 {
00618     AVIOContext *pb = s->pb;
00619     ASFContext *asf = s->priv_data;
00620     int n, stream_num, name_len, value_len, value_num;
00621     int ret, i;
00622     n = avio_rl16(pb);
00623 
00624     for(i=0;i<n;i++) {
00625         char name[1024];
00626         int av_unused value_type;
00627 
00628         avio_rl16(pb); //lang_list_index
00629         stream_num= avio_rl16(pb);
00630         name_len=   avio_rl16(pb);
00631         value_type = avio_rl16(pb); /* value_type */
00632         value_len=  avio_rl32(pb);
00633 
00634         if ((ret = avio_get_str16le(pb, name_len, name, sizeof(name))) < name_len)
00635             avio_skip(pb, name_len - ret);
00636         av_dlog(s, "%d %d %d %d %d <%s>\n",
00637                 i, stream_num, name_len, value_type, value_len, name);
00638         value_num= avio_rl16(pb);//we should use get_value() here but it does not work 2 is le16 here but le32 elsewhere
00639         avio_skip(pb, value_len - 2);
00640 
00641         if(stream_num<128){
00642             if     (!strcmp(name, "AspectRatioX")) asf->dar[stream_num].num= value_num;
00643             else if(!strcmp(name, "AspectRatioY")) asf->dar[stream_num].den= value_num;
00644         }
00645     }
00646 
00647     return 0;
00648 }
00649 
00650 static int asf_read_marker(AVFormatContext *s, int64_t size)
00651 {
00652     AVIOContext *pb = s->pb;
00653     int i, count, name_len, ret;
00654     char name[1024];
00655 
00656     avio_rl64(pb);            // reserved 16 bytes
00657     avio_rl64(pb);            // ...
00658     count = avio_rl32(pb);    // markers count
00659     avio_rl16(pb);            // reserved 2 bytes
00660     name_len = avio_rl16(pb); // name length
00661     for(i=0;i<name_len;i++){
00662         avio_r8(pb); // skip the name
00663     }
00664 
00665     for(i=0;i<count;i++){
00666         int64_t pres_time;
00667         int name_len;
00668 
00669         avio_rl64(pb);             // offset, 8 bytes
00670         pres_time = avio_rl64(pb); // presentation time
00671         avio_rl16(pb);             // entry length
00672         avio_rl32(pb);             // send time
00673         avio_rl32(pb);             // flags
00674         name_len = avio_rl32(pb);  // name length
00675         if ((ret = avio_get_str16le(pb, name_len * 2, name, sizeof(name))) < name_len)
00676             avio_skip(pb, name_len - ret);
00677         avpriv_new_chapter(s, i, (AVRational){1, 10000000}, pres_time, AV_NOPTS_VALUE, name );
00678     }
00679 
00680     return 0;
00681 }
00682 
00683 static int asf_read_header(AVFormatContext *s)
00684 {
00685     ASFContext *asf = s->priv_data;
00686     ff_asf_guid g;
00687     AVIOContext *pb = s->pb;
00688     int i;
00689     int64_t gsize;
00690 
00691     ff_get_guid(pb, &g);
00692     if (ff_guidcmp(&g, &ff_asf_header))
00693         return AVERROR_INVALIDDATA;
00694     avio_rl64(pb);
00695     avio_rl32(pb);
00696     avio_r8(pb);
00697     avio_r8(pb);
00698     memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
00699     for(;;) {
00700         uint64_t gpos= avio_tell(pb);
00701         ff_get_guid(pb, &g);
00702         gsize = avio_rl64(pb);
00703         print_guid(&g);
00704         if (!ff_guidcmp(&g, &ff_asf_data_header)) {
00705             asf->data_object_offset = avio_tell(pb);
00706             // if not streaming, gsize is not unlimited (how?), and there is enough space in the file..
00707             if (!(asf->hdr.flags & 0x01) && gsize >= 100) {
00708                 asf->data_object_size = gsize - 24;
00709             } else {
00710                 asf->data_object_size = (uint64_t)-1;
00711             }
00712             break;
00713         }
00714         if (gsize < 24)
00715             return AVERROR_INVALIDDATA;
00716         if (!ff_guidcmp(&g, &ff_asf_file_header)) {
00717             int ret = asf_read_file_properties(s, gsize);
00718             if (ret < 0)
00719                 return ret;
00720         } else if (!ff_guidcmp(&g, &ff_asf_stream_header)) {
00721             asf_read_stream_properties(s, gsize);
00722         } else if (!ff_guidcmp(&g, &ff_asf_comment_header)) {
00723             asf_read_content_desc(s, gsize);
00724         } else if (!ff_guidcmp(&g, &ff_asf_language_guid)) {
00725             asf_read_language_list(s, gsize);
00726         } else if (!ff_guidcmp(&g, &ff_asf_extended_content_header)) {
00727             asf_read_ext_content_desc(s, gsize);
00728         } else if (!ff_guidcmp(&g, &ff_asf_metadata_header)) {
00729             asf_read_metadata(s, gsize);
00730         } else if (!ff_guidcmp(&g, &ff_asf_ext_stream_header)) {
00731             asf_read_ext_stream_properties(s, gsize);
00732 
00733             // there could be a optional stream properties object to follow
00734             // if so the next iteration will pick it up
00735             continue;
00736         } else if (!ff_guidcmp(&g, &ff_asf_head1_guid)) {
00737             ff_get_guid(pb, &g);
00738             avio_skip(pb, 6);
00739             continue;
00740         } else if (!ff_guidcmp(&g, &ff_asf_marker_header)) {
00741             asf_read_marker(s, gsize);
00742         } else if (url_feof(pb)) {
00743             return AVERROR_EOF;
00744         } else {
00745             if (!s->keylen) {
00746                 if (!ff_guidcmp(&g, &ff_asf_content_encryption)) {
00747                     unsigned int len;
00748                     AVPacket pkt;
00749                     av_log(s, AV_LOG_WARNING, "DRM protected stream detected, decoding will likely fail!\n");
00750                     len= avio_rl32(pb);
00751                     av_log(s, AV_LOG_DEBUG, "Secret data:\n");
00752                     av_get_packet(pb, &pkt, len); av_hex_dump_log(s, AV_LOG_DEBUG, pkt.data, pkt.size); av_free_packet(&pkt);
00753                     len= avio_rl32(pb);
00754                     get_tag(s, "ASF_Protection_Type", -1, len);
00755                     len= avio_rl32(pb);
00756                     get_tag(s, "ASF_Key_ID", -1, len);
00757                     len= avio_rl32(pb);
00758                     get_tag(s, "ASF_License_URL", -1, len);
00759                 } else if (!ff_guidcmp(&g, &ff_asf_ext_content_encryption)) {
00760                     av_log(s, AV_LOG_WARNING, "Ext DRM protected stream detected, decoding will likely fail!\n");
00761                     av_dict_set(&s->metadata, "encryption", "ASF Extended Content Encryption", 0);
00762                 } else if (!ff_guidcmp(&g, &ff_asf_digital_signature)) {
00763                     av_log(s, AV_LOG_INFO, "Digital signature detected!\n");
00764                 }
00765             }
00766         }
00767         if(avio_tell(pb) != gpos + gsize)
00768             av_log(s, AV_LOG_DEBUG, "gpos mismatch our pos=%"PRIu64", end=%"PRIu64"\n", avio_tell(pb)-gpos, gsize);
00769         avio_seek(pb, gpos + gsize, SEEK_SET);
00770     }
00771     ff_get_guid(pb, &g);
00772     avio_rl64(pb);
00773     avio_r8(pb);
00774     avio_r8(pb);
00775     if (url_feof(pb))
00776         return AVERROR_EOF;
00777     asf->data_offset = avio_tell(pb);
00778     asf->packet_size_left = 0;
00779 
00780 
00781     for(i=0; i<128; i++){
00782         int stream_num= asf->asfid2avid[i];
00783         if(stream_num>=0){
00784             AVStream *st = s->streams[stream_num];
00785             if (!st->codec->bit_rate)
00786                 st->codec->bit_rate = asf->stream_bitrates[i];
00787             if (asf->dar[i].num > 0 && asf->dar[i].den > 0){
00788                 av_reduce(&st->sample_aspect_ratio.num,
00789                           &st->sample_aspect_ratio.den,
00790                           asf->dar[i].num, asf->dar[i].den, INT_MAX);
00791             } else if ((asf->dar[0].num > 0) && (asf->dar[0].den > 0) && (st->codec->codec_type==AVMEDIA_TYPE_VIDEO)) // Use ASF container value if the stream doesn't AR set.
00792                 av_reduce(&st->sample_aspect_ratio.num,
00793                           &st->sample_aspect_ratio.den,
00794                           asf->dar[0].num, asf->dar[0].den, INT_MAX);
00795 
00796             av_dlog(s, "i=%d, st->codec->codec_type:%d, asf->dar %d:%d sar=%d:%d\n",
00797                     i, st->codec->codec_type, asf->dar[i].num, asf->dar[i].den,
00798                     st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
00799 
00800             // copy and convert language codes to the frontend
00801             if (asf->streams[i].stream_language_index < 128) {
00802                 const char *rfc1766 = asf->stream_languages[asf->streams[i].stream_language_index];
00803                 if (rfc1766 && strlen(rfc1766) > 1) {
00804                     const char primary_tag[3] = { rfc1766[0], rfc1766[1], '\0' }; // ignore country code if any
00805                     const char *iso6392 = av_convert_lang_to(primary_tag, AV_LANG_ISO639_2_BIBL);
00806                     if (iso6392)
00807                         av_dict_set(&st->metadata, "language", iso6392, 0);
00808                 }
00809             }
00810         }
00811     }
00812 
00813     ff_metadata_conv(&s->metadata, NULL, ff_asf_metadata_conv);
00814 
00815     return 0;
00816 }
00817 
00818 #define DO_2BITS(bits, var, defval) \
00819     switch (bits & 3) \
00820     { \
00821     case 3: var = avio_rl32(pb); rsize += 4; break; \
00822     case 2: var = avio_rl16(pb); rsize += 2; break; \
00823     case 1: var = avio_r8(pb);   rsize++; break; \
00824     default: var = defval; break; \
00825     }
00826 
00833 static int ff_asf_get_packet(AVFormatContext *s, AVIOContext *pb)
00834 {
00835     ASFContext *asf = s->priv_data;
00836     uint32_t packet_length, padsize;
00837     int rsize = 8;
00838     int c, d, e, off;
00839 
00840     // if we do not know packet size, allow skipping up to 32 kB
00841     off= 32768;
00842     if (asf->no_resync_search)
00843         off = 3;
00844     else if (s->packet_size > 0)
00845         off= (avio_tell(pb) - s->data_offset) % s->packet_size + 3;
00846 
00847     c=d=e=-1;
00848     while(off-- > 0){
00849         c=d; d=e;
00850         e= avio_r8(pb);
00851         if(c == 0x82 && !d && !e)
00852             break;
00853     }
00854 
00855     if (c != 0x82) {
00862         if (pb->error == AVERROR(EAGAIN))
00863             return AVERROR(EAGAIN);
00864         if (!url_feof(pb))
00865             av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, avio_tell(pb));
00866     }
00867     if ((c & 0x8f) == 0x82) {
00868         if (d || e) {
00869             if (!url_feof(pb))
00870                 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
00871             return AVERROR_INVALIDDATA;
00872         }
00873         c= avio_r8(pb);
00874         d= avio_r8(pb);
00875         rsize+=3;
00876     }else if(!url_feof(pb)){
00877         avio_seek(pb, -1, SEEK_CUR); //FIXME
00878     }
00879 
00880     asf->packet_flags    = c;
00881     asf->packet_property = d;
00882 
00883     DO_2BITS(asf->packet_flags >> 5, packet_length, s->packet_size);
00884     DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
00885     DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
00886 
00887     //the following checks prevent overflows and infinite loops
00888     if(!packet_length || packet_length >= (1U<<29)){
00889         av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, avio_tell(pb));
00890         return AVERROR_INVALIDDATA;
00891     }
00892     if(padsize >= packet_length){
00893         av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, avio_tell(pb));
00894         return AVERROR_INVALIDDATA;
00895     }
00896 
00897     asf->packet_timestamp = avio_rl32(pb);
00898     avio_rl16(pb); /* duration */
00899     // rsize has at least 11 bytes which have to be present
00900 
00901     if (asf->packet_flags & 0x01) {
00902         asf->packet_segsizetype = avio_r8(pb); rsize++;
00903         asf->packet_segments = asf->packet_segsizetype & 0x3f;
00904     } else {
00905         asf->packet_segments = 1;
00906         asf->packet_segsizetype = 0x80;
00907     }
00908     if (rsize > packet_length - padsize) {
00909         asf->packet_size_left = 0;
00910         av_log(s, AV_LOG_ERROR,
00911                "invalid packet header length %d for pktlen %d-%d at %"PRId64"\n",
00912                rsize, packet_length, padsize, avio_tell(pb));
00913         return AVERROR_INVALIDDATA;
00914     }
00915     asf->packet_size_left = packet_length - padsize - rsize;
00916     if (packet_length < asf->hdr.min_pktsize)
00917         padsize += asf->hdr.min_pktsize - packet_length;
00918     asf->packet_padsize = padsize;
00919     av_dlog(s, "packet: size=%d padsize=%d  left=%d\n", s->packet_size, asf->packet_padsize, asf->packet_size_left);
00920     return 0;
00921 }
00922 
00927 static int asf_read_frame_header(AVFormatContext *s, AVIOContext *pb){
00928     ASFContext *asf = s->priv_data;
00929     ASFStream *asfst;
00930     int rsize = 1;
00931     int num = avio_r8(pb);
00932     int i;
00933     int64_t ts0, ts1 av_unused;
00934 
00935     asf->packet_segments--;
00936     asf->packet_key_frame = num >> 7;
00937     asf->stream_index = asf->asfid2avid[num & 0x7f];
00938     asfst = &asf->streams[num & 0x7f];
00939     // sequence should be ignored!
00940     DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
00941     DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
00942     DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
00943     av_dlog(asf, "key:%d stream:%d seq:%d offset:%d replic_size:%d\n",
00944             asf->packet_key_frame, asf->stream_index, asf->packet_seq,
00945             asf->packet_frag_offset, asf->packet_replic_size);
00946     if (rsize+asf->packet_replic_size > asf->packet_size_left) {
00947         av_log(s, AV_LOG_ERROR, "packet_replic_size %d is invalid\n", asf->packet_replic_size);
00948         return AVERROR_INVALIDDATA;
00949     }
00950     if (asf->packet_replic_size >= 8) {
00951         int64_t end = avio_tell(pb) + asf->packet_replic_size;
00952         AVRational aspect;
00953         asf->packet_obj_size = avio_rl32(pb);
00954         if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
00955             av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
00956             return AVERROR_INVALIDDATA;
00957         }
00958         asf->packet_frag_timestamp = avio_rl32(pb); // timestamp
00959 
00960         for (i=0; i<asfst->payload_ext_ct; i++) {
00961             ASFPayload *p = &asfst->payload[i];
00962             int size = p->size;
00963             int64_t payend;
00964             if(size == 0xFFFF)
00965                 size = avio_rl16(pb);
00966             payend = avio_tell(pb) + size;
00967             if (payend > end) {
00968                 av_log(s, AV_LOG_ERROR, "too long payload\n");
00969                 break;
00970             }
00971             switch(p->type) {
00972             case 0x50:
00973 //              duration = avio_rl16(pb);
00974                 break;
00975             case 0x54:
00976                 aspect.num = avio_r8(pb);
00977                 aspect.den = avio_r8(pb);
00978                 if (aspect.num > 0 && aspect.den > 0 && asf->stream_index >= 0) {
00979                     s->streams[asf->stream_index]->sample_aspect_ratio = aspect;
00980                 }
00981                 break;
00982             case 0x2A:
00983                 avio_skip(pb, 8);
00984                 ts0= avio_rl64(pb);
00985                 ts1= avio_rl64(pb);
00986                 if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
00987                 else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;
00988                 break;
00989             case 0x5B:
00990             case 0xB7:
00991             case 0xCC:
00992             case 0xC0:
00993             case 0xA0:
00994                 //unknown
00995                 break;
00996             }
00997             avio_seek(pb, payend, SEEK_SET);
00998         }
00999 
01000         avio_seek(pb, end, SEEK_SET);
01001         rsize += asf->packet_replic_size; // FIXME - check validity
01002     } else if (asf->packet_replic_size==1){
01003         // multipacket - frag_offset is beginning timestamp
01004         asf->packet_time_start = asf->packet_frag_offset;
01005         asf->packet_frag_offset = 0;
01006         asf->packet_frag_timestamp = asf->packet_timestamp;
01007 
01008         asf->packet_time_delta = avio_r8(pb);
01009         rsize++;
01010     }else if(asf->packet_replic_size!=0){
01011         av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
01012         return AVERROR_INVALIDDATA;
01013     }
01014     if (asf->packet_flags & 0x01) {
01015         DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
01016         if (rsize > asf->packet_size_left) {
01017             av_log(s, AV_LOG_ERROR, "packet_replic_size is invalid\n");
01018             return AVERROR_INVALIDDATA;
01019         } else if(asf->packet_frag_size > asf->packet_size_left - rsize){
01020             if (asf->packet_frag_size > asf->packet_size_left - rsize + asf->packet_padsize) {
01021                 av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid (%d-%d)\n", asf->packet_size_left, rsize);
01022                 return AVERROR_INVALIDDATA;
01023             } else {
01024                 int diff = asf->packet_frag_size - (asf->packet_size_left - rsize);
01025                 asf->packet_size_left += diff;
01026                 asf->packet_padsize   -= diff;
01027             }
01028         }
01029     } else {
01030         asf->packet_frag_size = asf->packet_size_left - rsize;
01031     }
01032     if (asf->packet_replic_size == 1) {
01033         asf->packet_multi_size = asf->packet_frag_size;
01034         if (asf->packet_multi_size > asf->packet_size_left)
01035             return AVERROR_INVALIDDATA;
01036     }
01037     asf->packet_size_left -= rsize;
01038 
01039     return 0;
01040 }
01041 
01051 static int ff_asf_parse_packet(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
01052 {
01053     ASFContext *asf = s->priv_data;
01054     ASFStream *asf_st = 0;
01055     for (;;) {
01056         int ret;
01057         if (url_feof(pb))
01058             return AVERROR_EOF;
01059 
01060         if (asf->packet_size_left < FRAME_HEADER_SIZE ||
01061             asf->packet_segments < 1) {
01062             int ret = asf->packet_size_left + asf->packet_padsize;
01063 
01064             assert(ret >= 0);
01065             /* fail safe */
01066             avio_skip(pb, ret);
01067 
01068             asf->packet_pos= avio_tell(pb);
01069             if (asf->data_object_size != (uint64_t)-1 &&
01070                 (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
01071                 return AVERROR_EOF; /* Do not exceed the size of the data object */
01072             return 1;
01073         }
01074         if (asf->packet_time_start == 0) {
01075             if (asf_read_frame_header(s, pb) < 0) {
01076                 asf->packet_segments = 0;
01077                 continue;
01078             }
01079             if (asf->stream_index < 0 ||
01080                 s->streams[asf->stream_index]->discard >= AVDISCARD_ALL ||
01081                 (!asf->packet_key_frame &&
01082                  s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)) {
01083                 asf->packet_time_start = 0;
01084                 /* unhandled packet (should not happen) */
01085                 avio_skip(pb, asf->packet_frag_size);
01086                 asf->packet_size_left -= asf->packet_frag_size;
01087                 if (asf->stream_index < 0)
01088                     av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
01089                 continue;
01090             }
01091             asf->asf_st = s->streams[asf->stream_index]->priv_data;
01092         }
01093         asf_st = asf->asf_st;
01094 
01095         if (asf->packet_replic_size == 1) {
01096             // frag_offset is here used as the beginning timestamp
01097             asf->packet_frag_timestamp = asf->packet_time_start;
01098             asf->packet_time_start    += asf->packet_time_delta;
01099             asf->packet_obj_size       = asf->packet_frag_size = avio_r8(pb);
01100             asf->packet_size_left--;
01101             asf->packet_multi_size--;
01102             if (asf->packet_multi_size < asf->packet_obj_size) {
01103                 asf->packet_time_start = 0;
01104                 avio_skip(pb, asf->packet_multi_size);
01105                 asf->packet_size_left -= asf->packet_multi_size;
01106                 continue;
01107             }
01108             asf->packet_multi_size -= asf->packet_obj_size;
01109         }
01110         if (asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size &&
01111             asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size) {
01112             av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n",
01113                    asf_st->frag_offset, asf->packet_frag_size,
01114                    asf->packet_obj_size, asf_st->pkt.size);
01115             asf->packet_obj_size = asf_st->pkt.size;
01116         }
01117 
01118         if (asf_st->pkt.size != asf->packet_obj_size ||
01119             //FIXME is this condition sufficient?
01120             asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) {
01121             if (asf_st->pkt.data) {
01122                 av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, "
01123                        "new %d\n", asf_st->pkt.size, asf->packet_obj_size);
01124                 asf_st->frag_offset = 0;
01125                 av_free_packet(&asf_st->pkt);
01126             }
01127             /* new packet */
01128             av_new_packet(&asf_st->pkt, asf->packet_obj_size);
01129             asf_st->seq              = asf->packet_seq;
01130             asf_st->pkt.dts          = asf->packet_frag_timestamp - asf->hdr.preroll;
01131             asf_st->pkt.stream_index = asf->stream_index;
01132             asf_st->pkt.pos          = asf_st->packet_pos = asf->packet_pos;
01133 
01134             if (asf_st->pkt.data && asf_st->palette_changed) {
01135                 uint8_t *pal;
01136                 pal = av_packet_new_side_data(&asf_st->pkt, AV_PKT_DATA_PALETTE,
01137                                               AVPALETTE_SIZE);
01138                 if (!pal) {
01139                     av_log(s, AV_LOG_ERROR, "Cannot append palette to packet\n");
01140                 } else {
01141                     memcpy(pal, asf_st->palette, AVPALETTE_SIZE);
01142                     asf_st->palette_changed = 0;
01143                 }
01144             }
01145             av_dlog(asf, "new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
01146                     asf->stream_index, asf->packet_key_frame,
01147                     asf_st->pkt.flags & AV_PKT_FLAG_KEY,
01148                     s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO,
01149                     asf->packet_obj_size);
01150             if (s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO)
01151                 asf->packet_key_frame = 1;
01152             if (asf->packet_key_frame)
01153                 asf_st->pkt.flags |= AV_PKT_FLAG_KEY;
01154         }
01155 
01156         /* read data */
01157         av_dlog(asf, "READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
01158                 s->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
01159                 asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
01160         asf->packet_size_left -= asf->packet_frag_size;
01161         if (asf->packet_size_left < 0)
01162             continue;
01163 
01164         if (asf->packet_frag_offset >= asf_st->pkt.size ||
01165             asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset) {
01166             av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
01167                    asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
01168             continue;
01169         }
01170 
01171         ret = avio_read(pb, asf_st->pkt.data + asf->packet_frag_offset,
01172                         asf->packet_frag_size);
01173         if (ret != asf->packet_frag_size) {
01174             if (ret < 0 || asf->packet_frag_offset + ret == 0)
01175                 return ret < 0 ? ret : AVERROR_EOF;
01176 
01177             if (asf_st->ds_span > 1) {
01178                 // scrambling, we can either drop it completely or fill the remainder
01179                 // TODO: should we fill the whole packet instead of just the current
01180                 // fragment?
01181                 memset(asf_st->pkt.data + asf->packet_frag_offset + ret, 0,
01182                        asf->packet_frag_size - ret);
01183                 ret = asf->packet_frag_size;
01184             } else {
01185                 // no scrambling, so we can return partial packets
01186                 av_shrink_packet(&asf_st->pkt, asf->packet_frag_offset + ret);
01187             }
01188         }
01189         if (s->key && s->keylen == 20)
01190             ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,
01191                             ret);
01192         asf_st->frag_offset += ret;
01193         /* test if whole packet is read */
01194         if (asf_st->frag_offset == asf_st->pkt.size) {
01195             //workaround for macroshit radio DVR-MS files
01196             if (s->streams[asf->stream_index]->codec->codec_id == AV_CODEC_ID_MPEG2VIDEO &&
01197                 asf_st->pkt.size > 100) {
01198                 int i;
01199                 for (i = 0; i < asf_st->pkt.size && !asf_st->pkt.data[i]; i++);
01200                 if (i == asf_st->pkt.size) {
01201                     av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");
01202                     asf_st->frag_offset = 0;
01203                     av_free_packet(&asf_st->pkt);
01204                     continue;
01205                 }
01206             }
01207 
01208             /* return packet */
01209             if (asf_st->ds_span > 1) {
01210                 if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span) {
01211                     av_log(s, AV_LOG_ERROR, "pkt.size != ds_packet_size * "
01212                            "ds_span (%d %d %d)\n", asf_st->pkt.size,
01213                            asf_st->ds_packet_size, asf_st->ds_span);
01214                 } else {
01215                     /* packet descrambling */
01216                     uint8_t *newdata = av_malloc(asf_st->pkt.size + FF_INPUT_BUFFER_PADDING_SIZE);
01217                     if (newdata) {
01218                         int offset = 0;
01219                         memset(newdata + asf_st->pkt.size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
01220                         while (offset < asf_st->pkt.size) {
01221                             int off = offset / asf_st->ds_chunk_size;
01222                             int row = off / asf_st->ds_span;
01223                             int col = off % asf_st->ds_span;
01224                             int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
01225                             assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
01226                             assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
01227                             memcpy(newdata + offset,
01228                                    asf_st->pkt.data + idx * asf_st->ds_chunk_size,
01229                                    asf_st->ds_chunk_size);
01230                             offset += asf_st->ds_chunk_size;
01231                         }
01232                         av_free(asf_st->pkt.data);
01233                         asf_st->pkt.data = newdata;
01234                     }
01235                 }
01236             }
01237             asf_st->frag_offset         = 0;
01238             *pkt                        = asf_st->pkt;
01239             asf_st->pkt.size            = 0;
01240             asf_st->pkt.data            = 0;
01241             asf_st->pkt.side_data_elems = 0;
01242             asf_st->pkt.side_data       = NULL;
01243             break; // packet completed
01244         }
01245     }
01246     return 0;
01247 }
01248 
01249 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
01250 {
01251     ASFContext *asf = s->priv_data;
01252 
01253     for (;;) {
01254         int ret;
01255 
01256         /* parse cached packets, if any */
01257         if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)
01258             return ret;
01259         if ((ret = ff_asf_get_packet(s, s->pb)) < 0)
01260             assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
01261         asf->packet_time_start = 0;
01262     }
01263 }
01264 
01265 // Added to support seeking after packets have been read
01266 // If information is not reset, read_packet fails due to
01267 // leftover information from previous reads
01268 static void asf_reset_header(AVFormatContext *s)
01269 {
01270     ASFContext *asf = s->priv_data;
01271     ASFStream *asf_st;
01272     int i;
01273 
01274     asf->packet_size_left = 0;
01275     asf->packet_segments = 0;
01276     asf->packet_flags = 0;
01277     asf->packet_property = 0;
01278     asf->packet_timestamp = 0;
01279     asf->packet_segsizetype = 0;
01280     asf->packet_segments = 0;
01281     asf->packet_seq = 0;
01282     asf->packet_replic_size = 0;
01283     asf->packet_key_frame = 0;
01284     asf->packet_padsize = 0;
01285     asf->packet_frag_offset = 0;
01286     asf->packet_frag_size = 0;
01287     asf->packet_frag_timestamp = 0;
01288     asf->packet_multi_size = 0;
01289     asf->packet_obj_size = 0;
01290     asf->packet_time_delta = 0;
01291     asf->packet_time_start = 0;
01292 
01293     for(i=0; i<s->nb_streams; i++){
01294         asf_st= s->streams[i]->priv_data;
01295         av_free_packet(&asf_st->pkt);
01296         asf_st->frag_offset=0;
01297         asf_st->seq=0;
01298     }
01299     asf->asf_st= NULL;
01300 }
01301 
01302 static int asf_read_close(AVFormatContext *s)
01303 {
01304     asf_reset_header(s);
01305 
01306     return 0;
01307 }
01308 
01309 static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
01310 {
01311     AVPacket pkt1, *pkt = &pkt1;
01312     ASFStream *asf_st;
01313     int64_t pts;
01314     int64_t pos= *ppos;
01315     int i;
01316     int64_t start_pos[ASF_MAX_STREAMS];
01317 
01318     for(i=0; i<s->nb_streams; i++){
01319         start_pos[i]= pos;
01320     }
01321 
01322     if (s->packet_size > 0)
01323         pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;
01324     *ppos= pos;
01325     if (avio_seek(s->pb, pos, SEEK_SET) < 0)
01326         return AV_NOPTS_VALUE;
01327 
01328     asf_reset_header(s);
01329     for(;;){
01330         if (av_read_frame(s, pkt) < 0){
01331             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
01332             return AV_NOPTS_VALUE;
01333         }
01334 
01335         pts = pkt->dts;
01336 
01337         av_free_packet(pkt);
01338         if(pkt->flags&AV_PKT_FLAG_KEY){
01339             i= pkt->stream_index;
01340 
01341             asf_st= s->streams[i]->priv_data;
01342 
01343 //            assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);
01344             pos= asf_st->packet_pos;
01345 
01346             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
01347             start_pos[i]= asf_st->packet_pos + 1;
01348 
01349             if(pkt->stream_index == stream_index)
01350                break;
01351         }
01352     }
01353 
01354     *ppos= pos;
01355     return pts;
01356 }
01357 
01358 static void asf_build_simple_index(AVFormatContext *s, int stream_index)
01359 {
01360     ff_asf_guid g;
01361     ASFContext *asf = s->priv_data;
01362     int64_t current_pos= avio_tell(s->pb);
01363 
01364     if(avio_seek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET) < 0) {
01365         asf->index_read= -1;
01366         return;
01367     }
01368 
01369     ff_get_guid(s->pb, &g);
01370 
01371     /* the data object can be followed by other top-level objects,
01372        skip them until the simple index object is reached */
01373     while (ff_guidcmp(&g, &ff_asf_simple_index_header)) {
01374         int64_t gsize= avio_rl64(s->pb);
01375         if (gsize < 24 || url_feof(s->pb)) {
01376             avio_seek(s->pb, current_pos, SEEK_SET);
01377             asf->index_read= -1;
01378             return;
01379         }
01380         avio_skip(s->pb, gsize-24);
01381         ff_get_guid(s->pb, &g);
01382     }
01383 
01384     {
01385         int64_t itime, last_pos=-1;
01386         int pct, ict;
01387         int i;
01388         int64_t av_unused gsize= avio_rl64(s->pb);
01389         ff_get_guid(s->pb, &g);
01390         itime=avio_rl64(s->pb);
01391         pct=avio_rl32(s->pb);
01392         ict=avio_rl32(s->pb);
01393         av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
01394 
01395         for (i=0;i<ict;i++){
01396             int pktnum=avio_rl32(s->pb);
01397             int pktct =avio_rl16(s->pb);
01398             int64_t pos      = s->data_offset + s->packet_size*(int64_t)pktnum;
01399             int64_t index_pts= FFMAX(av_rescale(itime, i, 10000) - asf->hdr.preroll, 0);
01400 
01401             if(pos != last_pos){
01402             av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d  pts: %"PRId64"\n", pktnum, pktct, index_pts);
01403             av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);
01404             last_pos=pos;
01405             }
01406         }
01407         asf->index_read= ict > 1;
01408     }
01409     avio_seek(s->pb, current_pos, SEEK_SET);
01410 }
01411 
01412 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
01413 {
01414     ASFContext *asf = s->priv_data;
01415     AVStream *st = s->streams[stream_index];
01416 
01417     if (s->packet_size <= 0)
01418         return -1;
01419 
01420     /* Try using the protocol's read_seek if available */
01421     if(s->pb) {
01422         int ret = avio_seek_time(s->pb, stream_index, pts, flags);
01423         if(ret >= 0)
01424             asf_reset_header(s);
01425         if (ret != AVERROR(ENOSYS))
01426             return ret;
01427     }
01428 
01429     if (!asf->index_read)
01430         asf_build_simple_index(s, stream_index);
01431 
01432     if((asf->index_read > 0 && st->index_entries)){
01433         int index= av_index_search_timestamp(st, pts, flags);
01434         if(index >= 0) {
01435             /* find the position */
01436             uint64_t pos = st->index_entries[index].pos;
01437 
01438             /* do the seek */
01439             av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
01440             if(avio_seek(s->pb, pos, SEEK_SET) < 0)
01441                 return -1;
01442             asf_reset_header(s);
01443             return 0;
01444         }
01445     }
01446     /* no index or seeking by index failed */
01447     if (ff_seek_frame_binary(s, stream_index, pts, flags) < 0)
01448         return -1;
01449     asf_reset_header(s);
01450     return 0;
01451 }
01452 
01453 AVInputFormat ff_asf_demuxer = {
01454     .name           = "asf",
01455     .long_name      = NULL_IF_CONFIG_SMALL("ASF (Advanced / Active Streaming Format)"),
01456     .priv_data_size = sizeof(ASFContext),
01457     .read_probe     = asf_probe,
01458     .read_header    = asf_read_header,
01459     .read_packet    = asf_read_packet,
01460     .read_close     = asf_read_close,
01461     .read_seek      = asf_read_seek,
01462     .read_timestamp = asf_read_pts,
01463     .flags          = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH,
01464     .priv_class     = &asf_class,
01465 };