FFmpeg  4.4.5
remove_extradata_bsf.c
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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 #include "bsf_internal.h"
27 
28 enum RemoveFreq {
32 };
33 
34 typedef struct RemoveExtradataContext {
35  const AVClass *class;
36  int freq;
37 
41 
43 {
45 
46  int ret;
47 
49  if (ret < 0)
50  return ret;
51 
52  if (s->parser && s->parser->parser->split) {
53  if (s->freq == REMOVE_FREQ_ALL ||
54  (s->freq == REMOVE_FREQ_NONKEYFRAME && !(pkt->flags & AV_PKT_FLAG_KEY)) ||
55  (s->freq == REMOVE_FREQ_KEYFRAME && pkt->flags & AV_PKT_FLAG_KEY)) {
56  int i = s->parser->parser->split(s->avctx, pkt->data, pkt->size);
57  pkt->data += i;
58  pkt->size -= i;
59  }
60  }
61 
62  return 0;
63 }
64 
66 {
68  int ret;
69 
70  s->parser = av_parser_init(ctx->par_in->codec_id);
71 
72  if (s->parser) {
73  s->avctx = avcodec_alloc_context3(NULL);
74  if (!s->avctx)
75  return AVERROR(ENOMEM);
76 
77  ret = avcodec_parameters_to_context(s->avctx, ctx->par_in);
78  if (ret < 0)
79  return ret;
80  }
81 
82  return 0;
83 }
84 
86 {
88 
89  avcodec_free_context(&s->avctx);
90  av_parser_close(s->parser);
91 }
92 
93 #define OFFSET(x) offsetof(RemoveExtradataContext, x)
94 #define FLAGS (AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_BSF_PARAM)
95 static const AVOption options[] = {
97  { "k", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = REMOVE_FREQ_NONKEYFRAME }, .flags = FLAGS, .unit = "freq" },
98  { "keyframe", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = REMOVE_FREQ_KEYFRAME }, .flags = FLAGS, .unit = "freq" },
99  { "e", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = REMOVE_FREQ_ALL }, .flags = FLAGS, .unit = "freq" },
100  { "all", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = REMOVE_FREQ_ALL }, .flags = FLAGS, .unit = "freq" },
101  { NULL },
102 };
103 
105  .class_name = "remove_extradata",
106  .item_name = av_default_item_name,
107  .option = options,
108  .version = LIBAVUTIL_VERSION_INT,
109 };
110 
112  .name = "remove_extra",
113  .priv_data_size = sizeof(RemoveExtradataContext),
114  .priv_class = &remove_extradata_class,
116  .close = remove_extradata_close,
118 };
Libavcodec external API header.
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:31
int ff_bsf_get_packet_ref(AVBSFContext *ctx, AVPacket *pkt)
Called by bitstream filters to get packet for filtering.
Definition: bsf.c:253
#define s(width, name)
Definition: cbs_vp9.c:257
static av_always_inline void filter(int16_t *output, ptrdiff_t out_stride, const int16_t *low, ptrdiff_t low_stride, const int16_t *high, ptrdiff_t high_stride, int len, int clip)
Definition: cfhddsp.c:27
#define NULL
Definition: coverity.c:32
@ AV_OPT_TYPE_CONST
Definition: opt.h:234
@ AV_OPT_TYPE_INT
Definition: opt.h:225
int avcodec_parameters_to_context(AVCodecContext *codec, const AVCodecParameters *par)
Fill the codec context based on the values from the supplied codec parameters.
Definition: codec_par.c:147
AVCodecContext * avcodec_alloc_context3(const AVCodec *codec)
Allocate an AVCodecContext and set its fields to default values.
Definition: options.c:173
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:188
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: packet.h:410
AVCodecParserContext * av_parser_init(int codec_id)
Definition: parser.c:34
void av_parser_close(AVCodecParserContext *s)
Definition: parser.c:228
#define AVERROR(e)
Definition: error.h:43
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:235
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
int i
Definition: input.c:407
AVOptions.
const AVBitStreamFilter ff_remove_extradata_bsf
static const AVClass remove_extradata_class
static const AVOption options[]
static int remove_extradata_init(AVBSFContext *ctx)
#define FLAGS
static int remove_extradata(AVBSFContext *ctx, AVPacket *pkt)
static void remove_extradata_close(AVBSFContext *ctx)
#define OFFSET(x)
@ REMOVE_FREQ_ALL
@ REMOVE_FREQ_NONKEYFRAME
@ REMOVE_FREQ_KEYFRAME
The bitstream filter state.
Definition: bsf.h:49
const char * name
Definition: bsf.h:99
Describe the class of an AVClass context structure.
Definition: log.h:67
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
main external API structure.
Definition: avcodec.h:536
void * priv_data
Format private data.
Definition: avformat.h:1260
AVOption.
Definition: opt.h:248
This structure stores compressed data.
Definition: packet.h:346
int flags
A combination of AV_PKT_FLAG values.
Definition: packet.h:375
int size
Definition: packet.h:370
uint8_t * data
Definition: packet.h:369
AVCodecParserContext * parser
AVPacket * pkt
Definition: movenc.c:59
AVFormatContext * ctx
Definition: movenc.c:48