FFmpeg
remove_extradata_bsf.c
Go to the documentation of this file.
1 /*
2  * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #include "libavutil/log.h"
22 #include "libavutil/opt.h"
23 
24 #include "avcodec.h"
25 #include "bsf.h"
26 
27 enum RemoveFreq {
31 };
32 
33 typedef struct RemoveExtradataContext {
34  const AVClass *class;
35  int freq;
36 
40 
42 {
44 
45  int ret;
46 
47  ret = ff_bsf_get_packet_ref(ctx, pkt);
48  if (ret < 0)
49  return ret;
50 
51  if (s->parser && s->parser->parser->split) {
52  if (s->freq == REMOVE_FREQ_ALL ||
53  (s->freq == REMOVE_FREQ_NONKEYFRAME && !(pkt->flags & AV_PKT_FLAG_KEY)) ||
54  (s->freq == REMOVE_FREQ_KEYFRAME && pkt->flags & AV_PKT_FLAG_KEY)) {
55  int i = s->parser->parser->split(s->avctx, pkt->data, pkt->size);
56  pkt->data += i;
57  pkt->size -= i;
58  }
59  }
60 
61  return 0;
62 }
63 
65 {
67  int ret;
68 
70 
71  if (s->parser) {
73  if (!s->avctx)
74  return AVERROR(ENOMEM);
75 
77  if (ret < 0)
78  return ret;
79  }
80 
81  return 0;
82 }
83 
85 {
87 
90 }
91 
92 #define OFFSET(x) offsetof(RemoveExtradataContext, x)
93 #define FLAGS (AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_BSF_PARAM)
94 static const AVOption options[] = {
96  { "k", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = REMOVE_FREQ_NONKEYFRAME }, .flags = FLAGS, .unit = "freq" },
97  { "keyframe", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = REMOVE_FREQ_KEYFRAME }, .flags = FLAGS, .unit = "freq" },
98  { "e", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = REMOVE_FREQ_ALL }, .flags = FLAGS, .unit = "freq" },
99  { "all", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = REMOVE_FREQ_ALL }, .flags = FLAGS, .unit = "freq" },
100  { NULL },
101 };
102 
104  .class_name = "remove_extradata",
105  .item_name = av_default_item_name,
106  .option = options,
107  .version = LIBAVUTIL_VERSION_INT,
108 };
109 
111  .name = "remove_extra",
112  .priv_data_size = sizeof(RemoveExtradataContext),
113  .priv_class = &remove_extradata_class,
115  .close = remove_extradata_close,
117 };
#define NULL
Definition: coverity.c:32
static const AVClass remove_extradata_class
AVOption.
Definition: opt.h:246
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3957
The bitstream filter state.
Definition: avcodec.h:5763
int size
Definition: avcodec.h:1478
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:191
int(* split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
Definition: avcodec.h:5286
static AVPacket pkt
void * priv_data
Opaque filter-specific private data.
Definition: avcodec.h:5784
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
Definition: log.h:72
AVOptions.
int avcodec_parameters_to_context(AVCodecContext *codec, const AVCodecParameters *par)
Fill the codec context based on the values from the supplied codec parameters.
Definition: utils.c:2096
const char * name
Definition: avcodec.h:5813
uint8_t * data
Definition: avcodec.h:1477
static void remove_extradata_close(AVBSFContext *ctx)
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: avcodec.h:1509
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:259
filter_frame For filters that do not use the this method is called when a frame is pushed to the filter s input It can be called at any time except in a reentrant way If the input frame is enough to produce then the filter should push the output frames on the output link immediately As an exception to the previous rule if the input frame is enough to produce several output frames then the filter needs output only at least one per link The additional frames can be left buffered in the filter
struct AVCodecParser * parser
Definition: avcodec.h:5110
#define FLAGS
#define OFFSET(x)
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:1483
AVCodecContext * avcodec_alloc_context3(const AVCodec *codec)
Allocate an AVCodecContext and set its fields to default values.
Definition: options.c:156
AVFormatContext * ctx
Definition: movenc.c:48
void av_parser_close(AVCodecParserContext *s)
Definition: parser.c:224
#define s(width, name)
Definition: cbs_vp9.c:257
static int remove_extradata_init(AVBSFContext *ctx)
AVCodecParserContext * av_parser_init(int codec_id)
Definition: parser.c:34
Libavcodec external API header.
void avcodec_free_context(AVCodecContext **avctx)
Free the codec context and everything associated with it and write NULL to the provided pointer...
Definition: options.c:171
main external API structure.
Definition: avcodec.h:1565
Describe the class of an AVClass context structure.
Definition: log.h:67
AVCodecParserContext * parser
static int remove_extradata(AVBSFContext *ctx, AVPacket *pkt)
const AVBitStreamFilter ff_remove_extradata_bsf
static const AVOption options[]
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later.That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another.Frame references ownership and permissions
This structure stores compressed data.
Definition: avcodec.h:1454
AVCodecParameters * par_in
Parameters of the input stream.
Definition: avcodec.h:5791
int ff_bsf_get_packet_ref(AVBSFContext *ctx, AVPacket *pkt)
Called by bitstream filters to get packet for filtering.
Definition: bsf.c:238