AVCodecParserContext *av_parser_init(int codec_id) { AVCodecParserContext *s; AVCodecParser *parser; int ret; if(codec_id == CODEC_ID_NONE) return NULL; for(parser = av_first_parser; parser != NULL; parser = parser->next) { if (parser->codec_ids[0] == codec_id || parser->codec_ids[1] == codec_id || parser->codec_ids[2] == codec_id || parser->codec_ids[3] == codec_id || parser->codec_ids[4] == codec_id) goto found; } return NULL; found: s = av_mallocz(sizeof(AVCodecParserContext)); if (!s) return NULL; s->parser = parser; if (parser->priv_data_size) { s->priv_data = av_mallocz(parser->priv_data_size); if (!s->priv_data) { av_free(s); return NULL; } } if (parser->parser_init) { ret = parser->parser_init(s); if (ret != 0) { av_free(s->priv_data); av_free(s); return NULL; } } s->fetch_timestamp=1; s->pict_type = FF_I_TYPE; s->key_frame = -1; s->convergence_duration = 0; s->dts_sync_point = INT_MIN; s->dts_ref_dts_delta = INT_MIN; s->pts_dts_delta = INT_MIN; return s; }