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hevc_parse.c
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1 /*
2  * This file is part of FFmpeg.
3  *
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.
8  *
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.
13  *
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
17  */
18 
19 #include "bytestream.h"
20 #include "h2645_parse.h"
21 #include "hevc.h"
22 #include "hevc_parse.h"
23 
24 static int hevc_decode_nal_units(const uint8_t *buf, int buf_size, HEVCParamSets *ps,
25  HEVCSEI *sei, int is_nalff, int nal_length_size,
26  int err_recognition, int apply_defdispwin, void *logctx)
27 {
28  int i;
29  int ret = 0;
30  H2645Packet pkt = { 0 };
31 
32  ret = ff_h2645_packet_split(&pkt, buf, buf_size, logctx, is_nalff, nal_length_size, AV_CODEC_ID_HEVC, 1);
33  if (ret < 0) {
34  goto done;
35  }
36 
37  for (i = 0; i < pkt.nb_nals; i++) {
38  H2645NAL *nal = &pkt.nals[i];
39 
40  /* ignore everything except parameter sets and VCL NALUs */
41  switch (nal->type) {
42  case HEVC_NAL_VPS:
43  ret = ff_hevc_decode_nal_vps(&nal->gb, logctx, ps);
44  if (ret < 0)
45  goto done;
46  break;
47  case HEVC_NAL_SPS:
48  ret = ff_hevc_decode_nal_sps(&nal->gb, logctx, ps, apply_defdispwin);
49  if (ret < 0)
50  goto done;
51  break;
52  case HEVC_NAL_PPS:
53  ret = ff_hevc_decode_nal_pps(&nal->gb, logctx, ps);
54  if (ret < 0)
55  goto done;
56  break;
59  ret = ff_hevc_decode_nal_sei(&nal->gb, logctx, sei, ps, nal->type);
60  if (ret < 0)
61  goto done;
62  break;
63  default:
64  av_log(logctx, AV_LOG_VERBOSE, "Ignoring NAL type %d in extradata\n", nal->type);
65  break;
66  }
67  }
68 
69 done:
71  if (err_recognition & AV_EF_EXPLODE)
72  return ret;
73 
74  return 0;
75 }
76 
78  HEVCSEI *sei, int *is_nalff, int *nal_length_size,
79  int err_recognition, int apply_defdispwin, void *logctx)
80 {
81  int ret = 0;
82  GetByteContext gb;
83 
84  bytestream2_init(&gb, data, size);
85 
86  if (size > 3 && (data[0] || data[1] || data[2] > 1)) {
87  /* It seems the extradata is encoded as hvcC format.
88  * Temporarily, we support configurationVersion==0 until 14496-15 3rd
89  * is finalized. When finalized, configurationVersion will be 1 and we
90  * can recognize hvcC by checking if avctx->extradata[0]==1 or not. */
91  int i, j, num_arrays, nal_len_size;
92 
93  *is_nalff = 1;
94 
95  bytestream2_skip(&gb, 21);
96  nal_len_size = (bytestream2_get_byte(&gb) & 3) + 1;
97  num_arrays = bytestream2_get_byte(&gb);
98 
99  /* nal units in the hvcC always have length coded with 2 bytes,
100  * so put a fake nal_length_size = 2 while parsing them */
101  *nal_length_size = 2;
102 
103  /* Decode nal units from hvcC. */
104  for (i = 0; i < num_arrays; i++) {
105  int type = bytestream2_get_byte(&gb) & 0x3f;
106  int cnt = bytestream2_get_be16(&gb);
107 
108  for (j = 0; j < cnt; j++) {
109  // +2 for the nal size field
110  int nalsize = bytestream2_peek_be16(&gb) + 2;
111  if (bytestream2_get_bytes_left(&gb) < nalsize) {
112  av_log(logctx, AV_LOG_ERROR,
113  "Invalid NAL unit size in extradata.\n");
114  return AVERROR_INVALIDDATA;
115  }
116 
117  ret = hevc_decode_nal_units(gb.buffer, nalsize, ps, sei, *is_nalff,
118  *nal_length_size, err_recognition, apply_defdispwin,
119  logctx);
120  if (ret < 0) {
121  av_log(logctx, AV_LOG_ERROR,
122  "Decoding nal unit %d %d from hvcC failed\n",
123  type, i);
124  return ret;
125  }
126  bytestream2_skip(&gb, nalsize);
127  }
128  }
129 
130  /* Now store right nal length size, that will be used to parse
131  * all other nals */
132  *nal_length_size = nal_len_size;
133  } else {
134  *is_nalff = 0;
135  ret = hevc_decode_nal_units(data, size, ps, sei, *is_nalff, *nal_length_size,
136  err_recognition, apply_defdispwin, logctx);
137  if (ret < 0)
138  return ret;
139  }
140 
141  return ret;
142 }
static int hevc_decode_nal_units(const uint8_t *buf, int buf_size, HEVCParamSets *ps, HEVCSEI *sei, int is_nalff, int nal_length_size, int err_recognition, int apply_defdispwin, void *logctx)
Definition: hevc_parse.c:24
int ff_h2645_packet_split(H2645Packet *pkt, const uint8_t *buf, int length, void *logctx, int is_nalff, int nal_length_size, enum AVCodecID codec_id, int small_padding)
Split an input packet into NAL units.
Definition: h2645_parse.c:263
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
Definition: bytestream.h:133
H.265 parser code.
int ff_hevc_decode_extradata(const uint8_t *data, int size, HEVCParamSets *ps, HEVCSEI *sei, int *is_nalff, int *nal_length_size, int err_recognition, int apply_defdispwin, void *logctx)
Definition: hevc_parse.c:77
static AVPacket pkt
uint8_t
void ff_h2645_packet_uninit(H2645Packet *pkt)
Free all the allocated memory in the packet.
Definition: h2645_parse.c:386
const uint8_t * buffer
Definition: bytestream.h:34
#define AV_LOG_VERBOSE
Detailed information.
Definition: log.h:192
ptrdiff_t size
Definition: opengl_enc.c:101
#define av_log(a,...)
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
int ff_hevc_decode_nal_vps(GetBitContext *gb, AVCodecContext *avctx, HEVCParamSets *ps)
Definition: hevc_ps.c:416
static av_always_inline void bytestream2_skip(GetByteContext *g, unsigned int size)
Definition: bytestream.h:164
static av_always_inline unsigned int bytestream2_get_bytes_left(GetByteContext *g)
Definition: bytestream.h:154
#define AV_EF_EXPLODE
abort decoding on minor error detection
Definition: avcodec.h:2623
int type
NAL unit type.
Definition: h2645_parse.h:51
void * buf
Definition: avisynth_c.h:690
GLint GLenum type
Definition: opengl_enc.c:105
int ff_hevc_decode_nal_pps(GetBitContext *gb, AVCodecContext *avctx, HEVCParamSets *ps)
Definition: hevc_ps.c:1462
int ff_hevc_decode_nal_sps(GetBitContext *gb, AVCodecContext *avctx, HEVCParamSets *ps, int apply_defdispwin)
Definition: hevc_ps.c:1218
static int FUNC() sei(CodedBitstreamContext *ctx, RWContext *rw, H264RawSEI *current)
GetBitContext gb
Definition: h2645_parse.h:46
H2645NAL * nals
Definition: h2645_parse.h:75
int ff_hevc_decode_nal_sei(GetBitContext *gb, void *logctx, HEVCSEI *s, const HEVCParamSets *ps, int type)
Definition: hevc_sei.c:347