History

lavc: add null codecs

They discard all input without ever returning any output. Useful for development.

Anton Khirnov committed 3 years ago

Commit e3a99041 parent 229f3255 files · +129 −0Browse files

Unified · Split

5 files
  1. libavcodec/Makefile +4 −0
  2. libavcodec/allcodecs.c +6 −0
  3. libavcodec/codec_desc.c +12 −0
  4. libavcodec/codec_id.h +10 −0
  5. libavcodec/null.c +97 −0
libavcodec/Makefile+4−0
@@ -219,6 +219,8 @@ OBJS-$(CONFIG_AMRWB_DECODER) += amrwbdec.o celp_filters.o \ · 218 unmodified lines
219 acelp_pitch_delay.o219 acelp_pitch_delay.o
220OBJS-$(CONFIG_AMV_ENCODER) += mjpegenc.o mjpegenc_common.o220OBJS-$(CONFIG_AMV_ENCODER) += mjpegenc.o mjpegenc_common.o
221OBJS-$(CONFIG_ANM_DECODER) += anm.o221OBJS-$(CONFIG_ANM_DECODER) += anm.o
222OBJS-$(CONFIG_ANULL_DECODER) += null.o
223OBJS-$(CONFIG_ANULL_ENCODER) += null.o
222OBJS-$(CONFIG_ANSI_DECODER) += ansi.o cga_data.o224OBJS-$(CONFIG_ANSI_DECODER) += ansi.o cga_data.o
223OBJS-$(CONFIG_APAC_DECODER) += apac.o225OBJS-$(CONFIG_APAC_DECODER) += apac.o
224OBJS-$(CONFIG_APE_DECODER) += apedec.o226OBJS-$(CONFIG_APE_DECODER) += apedec.o
@@ -747,6 +749,8 @@ OBJS-$(CONFIG_VCR1_DECODER) += vcr1.o · 522 unmodified lines
747OBJS-$(CONFIG_VMDAUDIO_DECODER) += vmdaudio.o749OBJS-$(CONFIG_VMDAUDIO_DECODER) += vmdaudio.o
748OBJS-$(CONFIG_VMDVIDEO_DECODER) += vmdvideo.o750OBJS-$(CONFIG_VMDVIDEO_DECODER) += vmdvideo.o
749OBJS-$(CONFIG_VMNC_DECODER) += vmnc.o751OBJS-$(CONFIG_VMNC_DECODER) += vmnc.o
752OBJS-$(CONFIG_VNULL_DECODER) += null.o
753OBJS-$(CONFIG_VNULL_ENCODER) += null.o
750OBJS-$(CONFIG_VORBIS_DECODER) += vorbisdec.o vorbisdsp.o vorbis.o \754OBJS-$(CONFIG_VORBIS_DECODER) += vorbisdec.o vorbisdsp.o vorbis.o \
751 vorbis_data.o755 vorbis_data.o
752OBJS-$(CONFIG_VORBIS_ENCODER) += vorbisenc.o vorbis.o \756OBJS-$(CONFIG_VORBIS_ENCODER) += vorbisenc.o vorbis.o \
libavcodec/allcodecs.c+6−0
@@ -884,6 +884,12 @@ extern const FFCodec ff_vp9_qsv_decoder; · 883 unmodified lines
884extern const FFCodec ff_vp9_vaapi_encoder;884extern const FFCodec ff_vp9_vaapi_encoder;
885extern const FFCodec ff_vp9_qsv_encoder;885extern const FFCodec ff_vp9_qsv_encoder;
886 886
887// null codecs
888extern const FFCodec ff_vnull_decoder;
889extern const FFCodec ff_vnull_encoder;
890extern const FFCodec ff_anull_decoder;
891extern const FFCodec ff_anull_encoder;
892
887// The iterate API is not usable with ossfuzz due to the excessive size of binaries created893// The iterate API is not usable with ossfuzz due to the excessive size of binaries created
888#if CONFIG_OSSFUZZ894#if CONFIG_OSSFUZZ
889const FFCodec * codec_list[] = {895const FFCodec * codec_list[] = {
libavcodec/codec_desc.c+12−0
@@ -3625,6 +3625,18 @@ static const AVCodecDescriptor codec_descriptors[] = { · 3624 unmodified lines
3625 .long_name = NULL_IF_CONFIG_SMALL("AVFrame to AVPacket passthrough"),3625 .long_name = NULL_IF_CONFIG_SMALL("AVFrame to AVPacket passthrough"),
3626 .props = AV_CODEC_PROP_LOSSLESS,3626 .props = AV_CODEC_PROP_LOSSLESS,
3627 },3627 },
3628 {
3629 .id = AV_CODEC_ID_VNULL,
3630 .type = AVMEDIA_TYPE_VIDEO,
3631 .name = "vnull",
3632 .long_name = NULL_IF_CONFIG_SMALL("Null video codec"),
3633 },
3634 {
3635 .id = AV_CODEC_ID_ANULL,
3636 .type = AVMEDIA_TYPE_AUDIO,
3637 .name = "anull",
3638 .long_name = NULL_IF_CONFIG_SMALL("Null audio codec"),
3639 },
3628};3640};
3629 3641
3630static int descriptor_compare(const void *key, const void *member)3642static int descriptor_compare(const void *key, const void *member)
libavcodec/codec_id.h+10−0
@@ -590,6 +590,16 @@ enum AVCodecID { · 589 unmodified lines
590 * stream (only used by libavformat) */590 * stream (only used by libavformat) */
591 AV_CODEC_ID_FFMETADATA = 0x21000, ///< Dummy codec for streams containing only metadata information.591 AV_CODEC_ID_FFMETADATA = 0x21000, ///< Dummy codec for streams containing only metadata information.
592 AV_CODEC_ID_WRAPPED_AVFRAME = 0x21001, ///< Passthrough codec, AVFrames wrapped in AVPacket592 AV_CODEC_ID_WRAPPED_AVFRAME = 0x21001, ///< Passthrough codec, AVFrames wrapped in AVPacket
593 /**
594 * Dummy null video codec, useful mainly for development and debugging.
595 * Null encoder/decoder discard all input and never return any output.
596 */
597 AV_CODEC_ID_VNULL,
598 /**
599 * Dummy null audio codec, useful mainly for development and debugging.
600 * Null encoder/decoder discard all input and never return any output.
601 */
602 AV_CODEC_ID_ANULL,
593};603};
594 604
595/**605/**
libavcodec/null.c+97−0
@@ -0,0 +1,97 @@
1/*
2 * Null codecs
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 "config_components.h"
22
23#include "codec_internal.h"
24#include "decode.h"
25#include "encode.h"
26
27#if CONFIG_VNULL_DECODER || CONFIG_ANULL_DECODER
28static int null_decode(AVCodecContext *avctx, AVFrame *frame,
29 int *got_frame, AVPacket *avpkt)
30{
31 *got_frame = 0;
32 return avpkt->size;
33}
34
35#if CONFIG_VNULL_DECODER
36const FFCodec ff_vnull_decoder = {
37 .p.name = "vnull",
38 CODEC_LONG_NAME("null video"),
39 .p.type = AVMEDIA_TYPE_VIDEO,
40 .p.id = AV_CODEC_ID_VNULL,
41 .p.capabilities = AV_CODEC_CAP_DR1,
42 FF_CODEC_DECODE_CB(null_decode),
43};
44#endif
45
46#if CONFIG_ANULL_DECODER
47const FFCodec ff_anull_decoder = {
48 .p.name = "anull",
49 CODEC_LONG_NAME("null audio"),
50 .p.type = AVMEDIA_TYPE_AUDIO,
51 .p.id = AV_CODEC_ID_ANULL,
52 .p.capabilities = AV_CODEC_CAP_DR1,
53 FF_CODEC_DECODE_CB(null_decode),
54};
55#endif
56
57#endif
58
59#if CONFIG_VNULL_ENCODER || CONFIG_ANULL_ENCODER
60static int null_encode(AVCodecContext *avctx, AVPacket *pkt,
61 const AVFrame *frame, int *got_packet)
62{
63 *got_packet = 0;
64 return 0;
65}
66
67#if CONFIG_VNULL_ENCODER
68const FFCodec ff_vnull_encoder = {
69 .p.name = "vnull",
70 CODEC_LONG_NAME("null video"),
71 .p.type = AVMEDIA_TYPE_VIDEO,
72 .p.id = AV_CODEC_ID_VNULL,
73 FF_CODEC_ENCODE_CB(null_encode),
74};
75#endif
76
77#if CONFIG_ANULL_ENCODER
78const FFCodec ff_anull_encoder = {
79 .p.name = "anull",
80 CODEC_LONG_NAME("null audio"),
81 .p.type = AVMEDIA_TYPE_AUDIO,
82 .p.id = AV_CODEC_ID_ANULL,
83 .p.capabilities = AV_CODEC_CAP_VARIABLE_FRAME_SIZE,
84 .p.sample_fmts = (const enum AVSampleFormat[]){
85 AV_SAMPLE_FMT_U8, AV_SAMPLE_FMT_U8P,
86 AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_S16P,
87 AV_SAMPLE_FMT_S32, AV_SAMPLE_FMT_S32P,
88 AV_SAMPLE_FMT_S64, AV_SAMPLE_FMT_S64P,
89 AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_FLTP,
90 AV_SAMPLE_FMT_DBL, AV_SAMPLE_FMT_DBLP,
91 AV_SAMPLE_FMT_NONE,
92 },
93 FF_CODEC_ENCODE_CB(null_encode),
94};
95#endif
96
97#endif

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