FFmpeg
remove_extradata.c
Go to the documentation of this file.
1 /*
2  * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
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 "libavutil/log.h"
22 #include "libavutil/opt.h"
23 
24 #include "av1_parse.h"
25 #include "bsf.h"
26 #include "bsf_internal.h"
27 #include "h264.h"
28 #include "startcode.h"
29 #include "vc1_common.h"
30 
31 #include "hevc/hevc.h"
32 
33 enum RemoveFreq {
37 };
38 
39 #define START_CODE 0x000001
40 
41 typedef struct RemoveExtradataContext {
42  const AVClass *class;
43  int freq;
45 
46 static int av1_split(const uint8_t *buf, int buf_size, void *logctx)
47 {
48  AV1OBU obu;
49  const uint8_t *ptr = buf, *end = buf + buf_size;
50 
51  while (ptr < end) {
52  int len = ff_av1_extract_obu(&obu, ptr, buf_size, logctx);
53  if (len < 0)
54  break;
55 
56  if (obu.type == AV1_OBU_FRAME_HEADER ||
57  obu.type == AV1_OBU_FRAME) {
58  return ptr - buf;
59  }
60  ptr += len;
61  buf_size -= len;
62  }
63 
64  return 0;
65 }
66 
67 static int h264_split(const uint8_t *buf, int buf_size)
68 {
69  const uint8_t *ptr = buf, *end = buf + buf_size;
70  uint32_t state = -1;
71  int has_sps = 0;
72  int has_pps = 0;
73  int nalu_type;
74 
75  while (ptr < end) {
76  ptr = avpriv_find_start_code(ptr, end, &state);
77  if ((state & 0xFFFFFF00) != 0x100)
78  break;
79  nalu_type = state & 0x1F;
80  if (nalu_type == H264_NAL_SPS) {
81  has_sps = 1;
82  } else if (nalu_type == H264_NAL_PPS)
83  has_pps = 1;
84  /* else if (nalu_type == 0x01 ||
85  * nalu_type == 0x02 ||
86  * nalu_type == 0x05) {
87  * }
88  */
89  else if ((nalu_type != H264_NAL_SEI || has_pps) &&
90  nalu_type != H264_NAL_AUD && nalu_type != H264_NAL_SPS_EXT &&
91  nalu_type != 0x0f) {
92  if (has_sps) {
93  while (ptr - 4 > buf && ptr[-5] == 0)
94  ptr--;
95  return ptr - 4 - buf;
96  }
97  }
98  }
99 
100  return 0;
101 }
102 
103 // Split after the parameter sets at the beginning of the stream if they exist.
104 static int hevc_split(const uint8_t *buf, int buf_size)
105 {
106  const uint8_t *ptr = buf, *end = buf + buf_size;
107  uint32_t state = -1;
108  int has_vps = 0;
109  int has_sps = 0;
110  int has_pps = 0;
111  int nut;
112 
113  while (ptr < end) {
114  ptr = avpriv_find_start_code(ptr, end, &state);
115  if ((state >> 8) != START_CODE)
116  break;
117  nut = (state >> 1) & 0x3F;
118  if (nut == HEVC_NAL_VPS)
119  has_vps = 1;
120  else if (nut == HEVC_NAL_SPS)
121  has_sps = 1;
122  else if (nut == HEVC_NAL_PPS)
123  has_pps = 1;
124  else if ((nut != HEVC_NAL_SEI_PREFIX || has_pps) &&
125  nut != HEVC_NAL_AUD) {
126  if (has_vps && has_sps) {
127  while (ptr - 4 > buf && ptr[-5] == 0)
128  ptr--;
129  return ptr - 4 - buf;
130  }
131  }
132  }
133  return 0;
134 }
135 
136 static int mpegvideo_split(const uint8_t *buf, int buf_size)
137 {
138  uint32_t state = -1;
139  int found = 0;
140 
141  for (int i = 0; i < buf_size; i++) {
142  state = (state << 8) | buf[i];
143  if (state == 0x1B3) {
144  found = 1;
145  } else if (found && state != 0x1B5 && state < 0x200 && state >= 0x100)
146  return i - 3;
147  }
148  return 0;
149 }
150 
151 static int mpeg4video_split(const uint8_t *buf, int buf_size)
152 {
153  const uint8_t *ptr = buf, *end = buf + buf_size;
154  uint32_t state = -1;
155 
156  while (ptr < end) {
157  ptr = avpriv_find_start_code(ptr, end, &state);
158  if (state == 0x1B3 || state == 0x1B6)
159  return ptr - 4 - buf;
160  }
161 
162  return 0;
163 }
164 
165 static int vc1_split(const uint8_t *buf, int buf_size)
166 {
167  const uint8_t *ptr = buf, *end = buf + buf_size;
168  uint32_t state = -1;
169  int charged = 0;
170 
171  while (ptr < end) {
172  ptr = avpriv_find_start_code(ptr, end, &state);
174  charged = 1;
175  } else if (charged && IS_MARKER(state))
176  return ptr - 4 - buf;
177  }
178 
179  return 0;
180 }
181 
183 {
185 
186  int ret;
187 
189  if (ret < 0)
190  return ret;
191 
192  if (s->freq == REMOVE_FREQ_ALL ||
193  (s->freq == REMOVE_FREQ_NONKEYFRAME && !(pkt->flags & AV_PKT_FLAG_KEY)) ||
194  (s->freq == REMOVE_FREQ_KEYFRAME && pkt->flags & AV_PKT_FLAG_KEY)) {
195  int i;
196 
197  switch (ctx->par_in->codec_id) {
198  case AV_CODEC_ID_AV1:
199  i = av1_split(pkt->data, pkt->size, ctx);
200  break;
201  case AV_CODEC_ID_AVS2:
202  case AV_CODEC_ID_AVS3:
203  case AV_CODEC_ID_CAVS:
204  case AV_CODEC_ID_MPEG4:
206  break;
207  case AV_CODEC_ID_H264:
208  i = h264_split(pkt->data, pkt->size);
209  break;
210  case AV_CODEC_ID_HEVC:
211  i = hevc_split(pkt->data, pkt->size);
212  break;
216  break;
217  case AV_CODEC_ID_VC1:
218  i = vc1_split(pkt->data, pkt->size);
219  break;
220  default:
221  i = 0;
222  }
223 
224  pkt->data += i;
225  pkt->size -= i;
226  }
227 
228  return 0;
229 }
230 
231 #define OFFSET(x) offsetof(RemoveExtradataContext, x)
232 #define FLAGS (AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_BSF_PARAM)
233 static const AVOption options[] = {
234  { "freq", NULL, OFFSET(freq), AV_OPT_TYPE_INT, { .i64 = REMOVE_FREQ_KEYFRAME }, REMOVE_FREQ_KEYFRAME, REMOVE_FREQ_NONKEYFRAME, FLAGS, .unit = "freq" },
235  { "k", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = REMOVE_FREQ_NONKEYFRAME }, .flags = FLAGS, .unit = "freq" },
236  { "keyframe", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = REMOVE_FREQ_KEYFRAME }, .flags = FLAGS, .unit = "freq" },
237  { "e", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = REMOVE_FREQ_ALL }, .flags = FLAGS, .unit = "freq" },
238  { "all", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = REMOVE_FREQ_ALL }, .flags = FLAGS, .unit = "freq" },
239  { NULL },
240 };
241 
243  .class_name = "remove_extradata",
244  .item_name = av_default_item_name,
245  .option = options,
246  .version = LIBAVUTIL_VERSION_INT,
247 };
248 
250  .p.name = "remove_extra",
251  .p.priv_class = &remove_extradata_class,
252  .priv_data_size = sizeof(RemoveExtradataContext),
254 };
HEVC_NAL_AUD
@ HEVC_NAL_AUD
Definition: hevc.h:64
bsf_internal.h
opt.h
AVBitStreamFilter::name
const char * name
Definition: bsf.h:112
AV_CODEC_ID_MPEG4
@ AV_CODEC_ID_MPEG4
Definition: codec_id.h:64
av1_split
static int av1_split(const uint8_t *buf, int buf_size, void *logctx)
Definition: remove_extradata.c:46
H264_NAL_AUD
@ H264_NAL_AUD
Definition: h264.h:43
AVPacket::data
uint8_t * data
Definition: packet.h:539
AVOption
AVOption.
Definition: opt.h:429
AV_CODEC_ID_AVS2
@ AV_CODEC_ID_AVS2
Definition: codec_id.h:248
AV1OBU
Definition: av1_parse.h:38
filter
void(* filter)(uint8_t *src, int stride, int qscale)
Definition: h263dsp.c:29
RemoveExtradataContext
Definition: remove_extradata.c:41
ff_remove_extradata_bsf
const FFBitStreamFilter ff_remove_extradata_bsf
Definition: remove_extradata.c:249
AV_PKT_FLAG_KEY
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: packet.h:594
AVBSFContext
The bitstream filter state.
Definition: bsf.h:68
remove_extradata_class
static const AVClass remove_extradata_class
Definition: remove_extradata.c:242
av1_parse.h
bsf.h
AV1_OBU_FRAME_HEADER
@ AV1_OBU_FRAME_HEADER
Definition: av1.h:32
OFFSET
#define OFFSET(x)
Definition: remove_extradata.c:231
HEVC_NAL_SEI_PREFIX
@ HEVC_NAL_SEI_PREFIX
Definition: hevc.h:68
ff_av1_extract_obu
int ff_av1_extract_obu(AV1OBU *obu, const uint8_t *buf, int length, void *logctx)
Extract an OBU from a raw bitstream.
Definition: av1_parse.c:29
pkt
AVPacket * pkt
Definition: movenc.c:60
s
#define s(width, name)
Definition: cbs_vp9.c:198
vc1_split
static int vc1_split(const uint8_t *buf, int buf_size)
Definition: remove_extradata.c:165
HEVC_NAL_VPS
@ HEVC_NAL_VPS
Definition: hevc.h:61
ctx
AVFormatContext * ctx
Definition: movenc.c:49
hevc.h
H264_NAL_SPS_EXT
@ H264_NAL_SPS_EXT
Definition: h264.h:47
AV_CODEC_ID_H264
@ AV_CODEC_ID_H264
Definition: codec_id.h:79
REMOVE_FREQ_ALL
@ REMOVE_FREQ_ALL
Definition: remove_extradata.c:35
AV_CODEC_ID_AVS3
@ AV_CODEC_ID_AVS3
Definition: codec_id.h:250
LIBAVUTIL_VERSION_INT
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:75
NULL
#define NULL
Definition: coverity.c:32
FFBitStreamFilter
Definition: bsf_internal.h:27
AV_CODEC_ID_AV1
@ AV_CODEC_ID_AV1
Definition: codec_id.h:284
h264_split
static int h264_split(const uint8_t *buf, int buf_size)
Definition: remove_extradata.c:67
state
static struct @466 state
VC1_CODE_SEQHDR
@ VC1_CODE_SEQHDR
Definition: vc1_common.h:40
av_default_item_name
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:237
IS_MARKER
#define IS_MARKER(state)
Definition: dca_parser.c:51
options
Definition: swscale.c:42
VC1_CODE_ENTRYPOINT
@ VC1_CODE_ENTRYPOINT
Definition: vc1_common.h:39
avpriv_find_start_code
const uint8_t * avpriv_find_start_code(const uint8_t *p, const uint8_t *end, uint32_t *state)
AV_CODEC_ID_MPEG1VIDEO
@ AV_CODEC_ID_MPEG1VIDEO
Definition: codec_id.h:53
AV1_OBU_FRAME
@ AV1_OBU_FRAME
Definition: av1.h:35
FFBitStreamFilter::p
AVBitStreamFilter p
The public AVBitStreamFilter.
Definition: bsf_internal.h:31
REMOVE_FREQ_NONKEYFRAME
@ REMOVE_FREQ_NONKEYFRAME
Definition: remove_extradata.c:36
AVPacket::size
int size
Definition: packet.h:540
HEVC_NAL_SPS
@ HEVC_NAL_SPS
Definition: hevc.h:62
FLAGS
#define FLAGS
Definition: remove_extradata.c:232
HEVC_NAL_PPS
@ HEVC_NAL_PPS
Definition: hevc.h:63
mpegvideo_split
static int mpegvideo_split(const uint8_t *buf, int buf_size)
Definition: remove_extradata.c:136
AVPacket::flags
int flags
A combination of AV_PKT_FLAG values.
Definition: packet.h:545
vc1_common.h
RemoveFreq
RemoveFreq
Definition: remove_extradata.c:33
log.h
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:256
AV_CODEC_ID_CAVS
@ AV_CODEC_ID_CAVS
Definition: codec_id.h:139
AV_CODEC_ID_HEVC
@ AV_CODEC_ID_HEVC
Definition: codec_id.h:228
H264_NAL_SEI
@ H264_NAL_SEI
Definition: h264.h:40
AV_CODEC_ID_VC1
@ AV_CODEC_ID_VC1
Definition: codec_id.h:122
len
int len
Definition: vorbis_enc_data.h:426
ret
ret
Definition: filter_design.txt:187
AVClass::class_name
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
Definition: log.h:80
options
static const AVOption options[]
Definition: remove_extradata.c:233
AV_OPT_TYPE_INT
@ AV_OPT_TYPE_INT
Underlying C type is int.
Definition: opt.h:259
mpeg4video_split
static int mpeg4video_split(const uint8_t *buf, int buf_size)
Definition: remove_extradata.c:151
RemoveExtradataContext::freq
int freq
Definition: remove_extradata.c:43
AV1OBU::type
int type
Definition: av1_parse.h:53
H264_NAL_PPS
@ H264_NAL_PPS
Definition: h264.h:42
hevc_split
static int hevc_split(const uint8_t *buf, int buf_size)
Definition: remove_extradata.c:104
AVPacket
This structure stores compressed data.
Definition: packet.h:516
h264.h
ff_bsf_get_packet_ref
int ff_bsf_get_packet_ref(AVBSFContext *ctx, AVPacket *pkt)
Called by bitstream filters to get packet for filtering.
Definition: bsf.c:256
H264_NAL_SPS
@ H264_NAL_SPS
Definition: h264.h:41
REMOVE_FREQ_KEYFRAME
@ REMOVE_FREQ_KEYFRAME
Definition: remove_extradata.c:34
START_CODE
#define START_CODE
Definition: remove_extradata.c:39
AV_CODEC_ID_MPEG2VIDEO
@ AV_CODEC_ID_MPEG2VIDEO
preferred ID for MPEG-1/2 video decoding
Definition: codec_id.h:54
AV_OPT_TYPE_CONST
@ AV_OPT_TYPE_CONST
Special option type for declaring named constants.
Definition: opt.h:299
AVFormatContext::priv_data
void * priv_data
Format private data.
Definition: avformat.h:1328
remove_extradata
static int remove_extradata(AVBSFContext *ctx, AVPacket *pkt)
Definition: remove_extradata.c:182