AVCodecParserContext *av_parser_init(int codec_id) { AVCodecParserContext *s = NULL; AVCodecParser *parser; int ret; if(codec_id == AV_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) goto err_out; s->parser = parser; s->priv_data = av_mallocz(parser->priv_data_size); if (!s->priv_data) goto err_out; s->fetch_timestamp=1; s->pict_type = AV_PICTURE_TYPE_I; if (parser->parser_init) { if (ff_lock_avcodec(NULL) < 0) goto err_out; ret = parser->parser_init(s); ff_unlock_avcodec(); if (ret != 0) goto err_out; } 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; err_out: if (s) av_freep(&s->priv_data); av_free(s); return NULL; }