FFmpeg
dump_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 <string.h>
22 
23 #include "bsf.h"
24 #include "bsf_internal.h"
25 
26 #include "libavutil/log.h"
27 #include "libavutil/opt.h"
28 
29 enum DumpFreq {
32 };
33 
34 typedef struct DumpExtradataContext {
35  const AVClass *class;
37  int freq;
39 
41 {
43  AVPacket *in = &s->pkt;
44  int ret = 0;
45 
47  if (ret < 0)
48  return ret;
49 
50  if (ctx->par_in->extradata &&
51  (s->freq == DUMP_FREQ_ALL ||
52  (s->freq == DUMP_FREQ_KEYFRAME && in->flags & AV_PKT_FLAG_KEY)) &&
53  (in->size < ctx->par_in->extradata_size ||
54  memcmp(in->data, ctx->par_in->extradata, ctx->par_in->extradata_size))) {
55  if (in->size >= INT_MAX - ctx->par_in->extradata_size) {
56  ret = AVERROR(ERANGE);
57  goto fail;
58  }
59 
60  ret = av_new_packet(out, in->size + ctx->par_in->extradata_size);
61  if (ret < 0)
62  goto fail;
63 
65  if (ret < 0) {
67  goto fail;
68  }
69 
70  memcpy(out->data, ctx->par_in->extradata, ctx->par_in->extradata_size);
71  memcpy(out->data + ctx->par_in->extradata_size, in->data, in->size);
72  } else {
74  }
75 
76 fail:
77  av_packet_unref(in);
78 
79  return ret;
80 }
81 
82 #define OFFSET(x) offsetof(DumpExtradataContext, x)
83 #define FLAGS (AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_BSF_PARAM)
84 static const AVOption options[] = {
85  { "freq", "When to dump extradata", OFFSET(freq), AV_OPT_TYPE_INT,
87  { "k", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = DUMP_FREQ_KEYFRAME }, .flags = FLAGS, .unit = "freq" },
88  { "keyframe", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = DUMP_FREQ_KEYFRAME }, .flags = FLAGS, .unit = "freq" },
89  { "e", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = DUMP_FREQ_ALL }, .flags = FLAGS, .unit = "freq" },
90  { "all", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = DUMP_FREQ_ALL }, .flags = FLAGS, .unit = "freq" },
91  { NULL },
92 };
93 
94 static const AVClass dump_extradata_class = {
95  .class_name = "dump_extradata bsf",
96  .item_name = av_default_item_name,
97  .option = options,
98  .version = LIBAVUTIL_VERSION_INT,
99 };
100 
102  .name = "dump_extra",
103  .priv_data_size = sizeof(DumpExtradataContext),
104  .priv_class = &dump_extradata_class,
106 };
av_packet_unref
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:403
AVERROR
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
opt.h
bsf_internal.h
out
FILE * out
Definition: movenc.c:54
AVBitStreamFilter::name
const char * name
Definition: bsf.h:99
DumpExtradataContext::pkt
AVPacket pkt
Definition: dump_extradata_bsf.c:36
AVPacket::data
uint8_t * data
Definition: packet.h:365
AVOption
AVOption.
Definition: opt.h:248
FLAGS
#define FLAGS
Definition: dump_extradata_bsf.c:83
filter
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
Definition: filter_design.txt:228
AV_PKT_FLAG_KEY
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: packet.h:396
AVBSFContext
The bitstream filter state.
Definition: bsf.h:49
dump_extradata_class
static const AVClass dump_extradata_class
Definition: dump_extradata_bsf.c:94
bsf.h
fail
#define fail()
Definition: checkasm.h:134
ff_dump_extradata_bsf
const AVBitStreamFilter ff_dump_extradata_bsf
Definition: dump_extradata_bsf.c:101
s
#define s(width, name)
Definition: cbs_vp9.c:257
av_new_packet
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
Definition: avpacket.c:94
DumpFreq
DumpFreq
Definition: dump_extradata_bsf.c:29
ctx
AVFormatContext * ctx
Definition: movenc.c:48
dump_extradata
static int dump_extradata(AVBSFContext *ctx, AVPacket *out)
Definition: dump_extradata_bsf.c:40
LIBAVUTIL_VERSION_INT
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:67
NULL
#define NULL
Definition: coverity.c:32
av_default_item_name
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:235
av_packet_move_ref
void av_packet_move_ref(AVPacket *dst, AVPacket *src)
Move every field in src to dst and reset src.
Definition: avpacket.c:459
options
static const AVOption options[]
Definition: dump_extradata_bsf.c:84
DumpExtradataContext
Definition: dump_extradata_bsf.c:34
AVPacket::size
int size
Definition: packet.h:366
DUMP_FREQ_ALL
@ DUMP_FREQ_ALL
Definition: dump_extradata_bsf.c:31
OFFSET
#define OFFSET(x)
Definition: dump_extradata_bsf.c:82
AVPacket::flags
int flags
A combination of AV_PKT_FLAG values.
Definition: packet.h:371
DumpExtradataContext::freq
int freq
Definition: dump_extradata_bsf.c:37
av_packet_copy_props
int av_packet_copy_props(AVPacket *dst, const AVPacket *src)
Copy only "properties" fields from src to dst.
Definition: avpacket.c:374
log.h
DUMP_FREQ_KEYFRAME
@ DUMP_FREQ_KEYFRAME
Definition: dump_extradata_bsf.c:30
ret
ret
Definition: filter_design.txt:187
AVClass::class_name
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
AVBitStreamFilter
Definition: bsf.h:98
AV_OPT_TYPE_INT
@ AV_OPT_TYPE_INT
Definition: opt.h:225
AVPacket
This structure stores compressed data.
Definition: packet.h:342
ff_bsf_get_packet_ref
int ff_bsf_get_packet_ref(AVBSFContext *ctx, AVPacket *pkt)
Called by bitstream filters to get packet for filtering.
Definition: bsf.c:250
AV_OPT_TYPE_CONST
@ AV_OPT_TYPE_CONST
Definition: opt.h:234
AVFormatContext::priv_data
void * priv_data
Format private data.
Definition: avformat.h:1134