2 * H.264/HEVC 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
21 #ifndef AVCODEC_H2645_PARSE_H
22 #define AVCODEC_H2645_PARSE_H
29 #define MAX_MBPAIR_SIZE (256*1024) // a tighter bound could be calculated if someone cares about a few bytes
31 typedef struct H2645NAL {
39 * Size, in bits, of just the data, excluding the stop bit and any trailing
40 * padding. I.e. what HEVC calls SODB.
45 const uint8_t *raw_data;
55 * HEVC only, nuh_temporal_id_plus_1 - 1
60 int skipped_bytes_pos_size;
61 int *skipped_bytes_pos;
63 * H.264 only, nal_ref_idc
68 /* an input packet split into unescaped NAL units */
69 typedef struct H2645Packet {
76 * Extract the raw (unescaped) bitstream.
78 int ff_h2645_extract_rbsp(const uint8_t *src, int length,
79 H2645NAL *nal, int small_padding);
82 * Split an input packet into NAL units.
84 int ff_h2645_packet_split(H2645Packet *pkt, const uint8_t *buf, int length,
85 void *logctx, int is_nalff, int nal_length_size,
86 enum AVCodecID codec_id, int small_padding);
89 * Free all the allocated memory in the packet.
91 void ff_h2645_packet_uninit(H2645Packet *pkt);
93 static inline int get_nalsize(int nal_length_size, const uint8_t *buf,
94 int buf_size, int *buf_index, void *logctx)
98 if (*buf_index >= buf_size - nal_length_size) {
99 // the end of the buffer is reached, refill it
100 return AVERROR(EAGAIN);
103 for (i = 0; i < nal_length_size; i++)
104 nalsize = ((unsigned)nalsize << 8) | buf[(*buf_index)++];
105 if (nalsize <= 0 || nalsize > buf_size - *buf_index) {
106 av_log(logctx, AV_LOG_ERROR,
107 "Invalid NAL unit size (%d > %d).\n", nalsize, buf_size - *buf_index);
108 return AVERROR_INVALIDDATA;
113 #endif /* AVCODEC_H2645_PARSE_H */