2 * AV1 common parsing code
4 * This file is part of FFmpeg.
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.
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.
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
23 #include "libavutil/mem.h"
26 #include "av1_parse.h"
27 #include "bytestream.h"
29 int ff_av1_extract_obu(AV1OBU *obu, const uint8_t *buf, int length, void *logctx)
32 int start_pos, type, temporal_id, spatial_id;
35 len = parse_obu_header(buf, length, &obu_size, &start_pos,
36 &type, &temporal_id, &spatial_id);
41 obu->temporal_id = temporal_id;
42 obu->spatial_id = spatial_id;
44 obu->data = buf + start_pos;
49 av_log(logctx, AV_LOG_DEBUG,
50 "obu_type: %d, temporal_id: %d, spatial_id: %d, payload size: %d\n",
51 obu->type, obu->temporal_id, obu->spatial_id, obu->size);
56 int ff_av1_packet_split(AV1Packet *pkt, const uint8_t *buf, int length, void *logctx)
61 bytestream2_init(&bc, buf, length);
64 while (bytestream2_get_bytes_left(&bc) > 0) {
67 if (pkt->obus_allocated < pkt->nb_obus + 1) {
68 int new_size = pkt->obus_allocated + 1;
69 AV1OBU *tmp = av_realloc_array(pkt->obus, new_size, sizeof(*tmp));
71 return AVERROR(ENOMEM);
74 memset(pkt->obus + pkt->obus_allocated, 0,
75 (new_size - pkt->obus_allocated) * sizeof(*tmp));
76 pkt->obus_allocated = new_size;
78 obu = &pkt->obus[pkt->nb_obus];
80 consumed = ff_av1_extract_obu(obu, bc.buffer, bytestream2_get_bytes_left(&bc), logctx);
84 bytestream2_skip(&bc, consumed);
86 obu->size_bits = get_obu_bit_length(obu->data, obu->size, obu->type);
88 if (obu->size_bits < 0 || (!obu->size_bits && obu->type != AV1_OBU_TEMPORAL_DELIMITER)) {
89 av_log(logctx, AV_LOG_ERROR, "Invalid OBU of type %d, skipping.\n", obu->type);
95 ret = init_get_bits(&obu->gb, obu->data, obu->size_bits);
103 void ff_av1_packet_uninit(AV1Packet *pkt)
105 av_freep(&pkt->obus);
106 pkt->obus_allocated = 0;