2 * This file is part of FFmpeg.
4 * FFmpeg is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
9 * FFmpeg is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 #include "bytestream.h"
20 #include "h2645_parse.h"
22 #include "hevc_parse.h"
24 static int hevc_decode_nal_units(const uint8_t *buf, int buf_size, HEVCParamSets *ps,
25 int is_nalff, int nal_length_size, void *logctx)
29 H2645Packet pkt = { 0 };
31 ret = ff_h2645_packet_split(&pkt, buf, buf_size, logctx, is_nalff, nal_length_size, AV_CODEC_ID_HEVC, 1);
36 for (i = 0; i < pkt.nb_nals; i++) {
37 H2645NAL *nal = &pkt.nals[i];
39 /* ignore everything except parameter sets and VCL NALUs */
41 case HEVC_NAL_VPS: ff_hevc_decode_nal_vps(&nal->gb, logctx, ps); break;
42 case HEVC_NAL_SPS: ff_hevc_decode_nal_sps(&nal->gb, logctx, ps, 1); break;
43 case HEVC_NAL_PPS: ff_hevc_decode_nal_pps(&nal->gb, logctx, ps); break;
45 av_log(logctx, AV_LOG_VERBOSE, "Ignoring NAL type %d in extradata\n", nal->type);
51 ff_h2645_packet_uninit(&pkt);
55 int ff_hevc_decode_extradata(const uint8_t *data, int size, HEVCParamSets *ps,
56 int *is_nalff, int *nal_length_size,
57 int err_recognition, void *logctx)
62 bytestream2_init(&gb, data, size);
64 if (size > 3 && (data[0] || data[1] || data[2] > 1)) {
65 /* It seems the extradata is encoded as hvcC format.
66 * Temporarily, we support configurationVersion==0 until 14496-15 3rd
67 * is finalized. When finalized, configurationVersion will be 1 and we
68 * can recognize hvcC by checking if avctx->extradata[0]==1 or not. */
69 int i, j, num_arrays, nal_len_size;
73 bytestream2_skip(&gb, 21);
74 nal_len_size = (bytestream2_get_byte(&gb) & 3) + 1;
75 num_arrays = bytestream2_get_byte(&gb);
77 /* nal units in the hvcC always have length coded with 2 bytes,
78 * so put a fake nal_length_size = 2 while parsing them */
81 /* Decode nal units from hvcC. */
82 for (i = 0; i < num_arrays; i++) {
83 int type = bytestream2_get_byte(&gb) & 0x3f;
84 int cnt = bytestream2_get_be16(&gb);
86 for (j = 0; j < cnt; j++) {
87 // +2 for the nal size field
88 int nalsize = bytestream2_peek_be16(&gb) + 2;
89 if (bytestream2_get_bytes_left(&gb) < nalsize) {
90 av_log(logctx, AV_LOG_ERROR,
91 "Invalid NAL unit size in extradata.\n");
92 return AVERROR_INVALIDDATA;
95 ret = hevc_decode_nal_units(gb.buffer, nalsize, ps, *is_nalff, *nal_length_size, logctx);
97 av_log(logctx, AV_LOG_ERROR,
98 "Decoding nal unit %d %d from hvcC failed\n",
102 bytestream2_skip(&gb, nalsize);
106 /* Now store right nal length size, that will be used to parse
108 *nal_length_size = nal_len_size;
111 ret = hevc_decode_nal_units(data, size, ps, *is_nalff, *nal_length_size, logctx);