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lavc: add new API for iterating codecs and codec parsers

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Based on an unfinished patch by atomnuker.
This commit is contained in:
Josh de Kock 2017-12-22 22:17:00 +00:00
parent caa4bd7a9f
commit 7e8eba2d87
9 changed files with 963 additions and 735 deletions
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84
libavcodec/parser.c
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@ -32,36 +32,100 @@
#include "internal.h"
#include "parser.h"
static AVCodecParser *av_first_parser = NULL;
/* Parsers */
extern AVCodecParser ff_aac_parser;
extern AVCodecParser ff_aac_latm_parser;
extern AVCodecParser ff_ac3_parser;
extern AVCodecParser ff_adx_parser;
extern AVCodecParser ff_bmp_parser;
extern AVCodecParser ff_cavsvideo_parser;
extern AVCodecParser ff_cook_parser;
extern AVCodecParser ff_dca_parser;
extern AVCodecParser ff_dirac_parser;
extern AVCodecParser ff_dnxhd_parser;
extern AVCodecParser ff_dpx_parser;
extern AVCodecParser ff_dvaudio_parser;
extern AVCodecParser ff_dvbsub_parser;
extern AVCodecParser ff_dvdsub_parser;
extern AVCodecParser ff_dvd_nav_parser;
extern AVCodecParser ff_flac_parser;
extern AVCodecParser ff_g729_parser;
extern AVCodecParser ff_gsm_parser;
extern AVCodecParser ff_h261_parser;
extern AVCodecParser ff_h263_parser;
extern AVCodecParser ff_h264_parser;
extern AVCodecParser ff_hevc_parser;
extern AVCodecParser ff_mjpeg_parser;
extern AVCodecParser ff_mlp_parser;
extern AVCodecParser ff_mpeg4video_parser;
extern AVCodecParser ff_mpegaudio_parser;
extern AVCodecParser ff_mpegvideo_parser;
extern AVCodecParser ff_opus_parser;
extern AVCodecParser ff_png_parser;
extern AVCodecParser ff_pnm_parser;
extern AVCodecParser ff_rv30_parser;
extern AVCodecParser ff_rv40_parser;
extern AVCodecParser ff_sipr_parser;
extern AVCodecParser ff_tak_parser;
extern AVCodecParser ff_vc1_parser;
extern AVCodecParser ff_vorbis_parser;
extern AVCodecParser ff_vp3_parser;
extern AVCodecParser ff_vp8_parser;
extern AVCodecParser ff_vp9_parser;
extern AVCodecParser ff_xma_parser;
#include "libavcodec/parser_list.c"
static AVOnce av_parser_next_init = AV_ONCE_INIT;
static void av_parser_init_next(void)
{
AVCodecParser *prev = NULL, *p;
int i = 0;
while ((p = (AVCodecParser*)parser_list[i++])) {
if (prev)
prev->next = p;
prev = p;
}
}
AVCodecParser *av_parser_next(const AVCodecParser *p)
{
ff_thread_once(&av_parser_next_init, av_parser_init_next);
if (p)
return p->next;
else
return av_first_parser;
return (AVCodecParser*)parser_list[0];
}
static AVMutex parser_register_mutex = AV_MUTEX_INITIALIZER;
const AVCodecParser *av_parser_iterate(void **opaque)
{
uintptr_t i = (uintptr_t)*opaque;
const AVCodecParser *p = parser_list[i];
if (p)
*opaque = (void*)(i + 1);
return p;
}
void av_register_codec_parser(AVCodecParser *parser)
{
ff_mutex_lock(&parser_register_mutex);
parser->next = av_first_parser;
av_first_parser = parser;
ff_mutex_unlock(&parser_register_mutex);
ff_thread_once(&av_parser_next_init, av_parser_init_next);
}
AVCodecParserContext *av_parser_init(int codec_id)
{
AVCodecParserContext *s = NULL;
AVCodecParser *parser;
const AVCodecParser *parser;
void *i = 0;
int ret;
if (codec_id == AV_CODEC_ID_NONE)
return NULL;
for (parser = av_first_parser; parser; parser = parser->next) {
while ((parser = av_parser_iterate(&i))) {
if (parser->codec_ids[0] == codec_id ||
parser->codec_ids[1] == codec_id ||
parser->codec_ids[2] == codec_id ||
@ -75,7 +139,7 @@ found:
s = av_mallocz(sizeof(AVCodecParserContext));
if (!s)
goto err_out;
s->parser = parser;
s->parser = (AVCodecParser*)parser;
s->priv_data = av_mallocz(parser->priv_data_size);
if (!s->priv_data)
goto err_out;