xref: /third_party/ffmpeg/libavcodec/av1_parse.c (revision cabdff1a) 
1/*
2 * AV1 common parsing code
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.h"
22
23#include "libavutil/mem.h"
24
25#include "av1.h"
26#include "av1_parse.h"
27#include "bytestream.h"
28
29int ff_av1_extract_obu(AV1OBU *obu, const uint8_t *buf, int length, void *logctx)
30{
31    int64_t obu_size;
32    int start_pos, type, temporal_id, spatial_id;
33    int len;
34
35    len = parse_obu_header(buf, length, &obu_size, &start_pos,
36                           &type, &temporal_id, &spatial_id);
37    if (len < 0)
38        return len;
39
40    obu->type        = type;
41    obu->temporal_id = temporal_id;
42    obu->spatial_id  = spatial_id;
43
44    obu->data     = buf + start_pos;
45    obu->size     = obu_size;
46    obu->raw_data = buf;
47    obu->raw_size = len;
48
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);
52
53    return len;
54}
55
56int ff_av1_packet_split(AV1Packet *pkt, const uint8_t *buf, int length, void *logctx)
57{
58    GetByteContext bc;
59    int ret, consumed;
60
61    bytestream2_init(&bc, buf, length);
62    pkt->nb_obus = 0;
63
64    while (bytestream2_get_bytes_left(&bc) > 0) {
65        AV1OBU *obu;
66
67        if (pkt->obus_allocated < pkt->nb_obus + 1) {
68            int new_size = pkt->obus_allocated + 1;
69            AV1OBU *tmp;
70
71            if (new_size >= INT_MAX / sizeof(*tmp))
72                return AVERROR(ENOMEM);
73            tmp = av_fast_realloc(pkt->obus, &pkt->obus_allocated_size, new_size * sizeof(*tmp));
74            if (!tmp)
75                return AVERROR(ENOMEM);
76
77            pkt->obus = tmp;
78            memset(pkt->obus + pkt->obus_allocated, 0, sizeof(*pkt->obus));
79            pkt->obus_allocated = new_size;
80        }
81        obu = &pkt->obus[pkt->nb_obus];
82
83        consumed = ff_av1_extract_obu(obu, bc.buffer, bytestream2_get_bytes_left(&bc), logctx);
84        if (consumed < 0)
85            return consumed;
86
87        bytestream2_skip(&bc, consumed);
88
89        obu->size_bits = get_obu_bit_length(obu->data, obu->size, obu->type);
90
91        if (obu->size_bits < 0 || (!obu->size_bits && obu->type != AV1_OBU_TEMPORAL_DELIMITER)) {
92            av_log(logctx, AV_LOG_ERROR, "Invalid OBU of type %d, skipping.\n", obu->type);
93            continue;
94        }
95
96        pkt->nb_obus++;
97
98        ret = init_get_bits(&obu->gb, obu->data, obu->size_bits);
99        if (ret < 0)
100            return ret;
101    }
102
103    return 0;
104}
105
106void ff_av1_packet_uninit(AV1Packet *pkt)
107{
108    av_freep(&pkt->obus);
109    pkt->obus_allocated = pkt->obus_allocated_size = 0;
110}
111