FFmpeg  4.2.2
mpeg2_metadata_bsf.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 "libavutil/avstring.h"
20 #include "libavutil/common.h"
21 #include "libavutil/opt.h"
22 
23 #include "bsf.h"
24 #include "cbs.h"
25 #include "cbs_mpeg2.h"
26 #include "mpeg12.h"
27 
28 typedef struct MPEG2MetadataContext {
29  const AVClass *class;
30 
33 
35 
37 
39 
44 
47 
48 
51 {
56  int i, se_pos;
57 
58  for (i = 0; i < frag->nb_units; i++) {
59  if (frag->units[i].type == MPEG2_START_SEQUENCE_HEADER) {
60  sh = frag->units[i].content;
61  } else if (frag->units[i].type == MPEG2_START_EXTENSION) {
62  MPEG2RawExtensionData *ext = frag->units[i].content;
65  se = &ext->data.sequence;
66  se_pos = i;
67  } else if (ext->extension_start_code_identifier ==
69  sde = &ext->data.sequence_display;
70  }
71  }
72  }
73 
74  if (!sh || !se) {
75  // No sequence header and sequence extension: not an MPEG-2 video
76  // sequence.
77  if (sh && !ctx->mpeg1_warned) {
78  av_log(bsf, AV_LOG_WARNING, "Stream contains a sequence "
79  "header but not a sequence extension: maybe it's "
80  "actually MPEG-1?\n");
81  ctx->mpeg1_warned = 1;
82  }
83  return 0;
84  }
85 
87  int num, den;
88 
89  av_reduce(&num, &den, ctx->display_aspect_ratio.num,
90  ctx->display_aspect_ratio.den, 65535);
91 
92  if (num == 4 && den == 3)
94  else if (num == 16 && den == 9)
96  else if (num == 221 && den == 100)
98  else
100  }
101 
102  if (ctx->frame_rate.num && ctx->frame_rate.den) {
103  int code, ext_n, ext_d;
104 
106  &code, &ext_n, &ext_d, 0);
107 
108  sh->frame_rate_code = code;
109  se->frame_rate_extension_n = ext_n;
110  se->frame_rate_extension_d = ext_d;
111  }
112 
113  if (ctx->video_format >= 0 ||
114  ctx->colour_primaries >= 0 ||
115  ctx->transfer_characteristics >= 0 ||
116  ctx->matrix_coefficients >= 0) {
117  if (!sde) {
118  int err;
124 
126  .video_format = 5,
127 
128  .colour_description = 0,
129  .colour_primaries = 2,
130  .transfer_characteristics = 2,
131  .matrix_coefficients = 2,
132 
133  .display_horizontal_size =
135  .display_vertical_size =
137  };
138 
139  err = ff_cbs_insert_unit_content(ctx->cbc, frag, se_pos + 1,
142  NULL);
143  if (err < 0) {
144  av_log(bsf, AV_LOG_ERROR, "Failed to insert new sequence "
145  "display extension.\n");
146  return err;
147  }
148  }
149 
150  if (ctx->video_format >= 0)
151  sde->video_format = ctx->video_format;
152 
153  if (ctx->colour_primaries >= 0 ||
154  ctx->transfer_characteristics >= 0 ||
155  ctx->matrix_coefficients >= 0) {
156  sde->colour_description = 1;
157 
158  if (ctx->colour_primaries >= 0)
160 
161  if (ctx->transfer_characteristics >= 0)
163 
164  if (ctx->matrix_coefficients >= 0)
166  }
167  }
168 
169  return 0;
170 }
171 
173 {
175  CodedBitstreamFragment *frag = &ctx->fragment;
176  int err;
177 
178  err = ff_bsf_get_packet_ref(bsf, pkt);
179  if (err < 0)
180  return err;
181 
182  err = ff_cbs_read_packet(ctx->cbc, frag, pkt);
183  if (err < 0) {
184  av_log(bsf, AV_LOG_ERROR, "Failed to read packet.\n");
185  goto fail;
186  }
187 
188  err = mpeg2_metadata_update_fragment(bsf, frag);
189  if (err < 0) {
190  av_log(bsf, AV_LOG_ERROR, "Failed to update frame fragment.\n");
191  goto fail;
192  }
193 
194  err = ff_cbs_write_packet(ctx->cbc, pkt, frag);
195  if (err < 0) {
196  av_log(bsf, AV_LOG_ERROR, "Failed to write packet.\n");
197  goto fail;
198  }
199 
200  err = 0;
201 fail:
202  ff_cbs_fragment_reset(ctx->cbc, frag);
203 
204  if (err < 0)
205  av_packet_unref(pkt);
206 
207  return err;
208 }
209 
211 {
213  CodedBitstreamFragment *frag = &ctx->fragment;
214  int err;
215 
216 #define VALIDITY_CHECK(name) do { \
217  if (!ctx->name) { \
218  av_log(bsf, AV_LOG_ERROR, "The value 0 for %s is " \
219  "forbidden.\n", #name); \
220  return AVERROR(EINVAL); \
221  } \
222  } while (0)
226 #undef VALIDITY_CHECK
227 
228  err = ff_cbs_init(&ctx->cbc, AV_CODEC_ID_MPEG2VIDEO, bsf);
229  if (err < 0)
230  return err;
231 
232  if (bsf->par_in->extradata) {
233  err = ff_cbs_read_extradata(ctx->cbc, frag, bsf->par_in);
234  if (err < 0) {
235  av_log(bsf, AV_LOG_ERROR, "Failed to read extradata.\n");
236  goto fail;
237  }
238 
239  err = mpeg2_metadata_update_fragment(bsf, frag);
240  if (err < 0) {
241  av_log(bsf, AV_LOG_ERROR, "Failed to update metadata fragment.\n");
242  goto fail;
243  }
244 
245  err = ff_cbs_write_extradata(ctx->cbc, bsf->par_out, frag);
246  if (err < 0) {
247  av_log(bsf, AV_LOG_ERROR, "Failed to write extradata.\n");
248  goto fail;
249  }
250  }
251 
252  err = 0;
253 fail:
254  ff_cbs_fragment_reset(ctx->cbc, frag);
255  return err;
256 }
257 
259 {
261 
262  ff_cbs_fragment_free(ctx->cbc, &ctx->fragment);
263  ff_cbs_close(&ctx->cbc);
264 }
265 
266 #define OFFSET(x) offsetof(MPEG2MetadataContext, x)
267 #define FLAGS (AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_BSF_PARAM)
269  { "display_aspect_ratio", "Set display aspect ratio (table 6-3)",
271  { .dbl = 0.0 }, 0, 65535, FLAGS },
272 
273  { "frame_rate", "Set frame rate",
275  { .dbl = 0.0 }, 0, UINT_MAX, FLAGS },
276 
277  { "video_format", "Set video format (table 6-6)",
279  { .i64 = -1 }, -1, 7, FLAGS },
280  { "colour_primaries", "Set colour primaries (table 6-7)",
282  { .i64 = -1 }, -1, 255, FLAGS },
283  { "transfer_characteristics", "Set transfer characteristics (table 6-8)",
285  { .i64 = -1 }, -1, 255, FLAGS },
286  { "matrix_coefficients", "Set matrix coefficients (table 6-9)",
288  { .i64 = -1 }, -1, 255, FLAGS },
289 
290  { NULL }
291 };
292 
294  .class_name = "mpeg2_metadata_bsf",
295  .item_name = av_default_item_name,
296  .option = mpeg2_metadata_options,
297  .version = LIBAVUTIL_VERSION_INT,
298 };
299 
300 static const enum AVCodecID mpeg2_metadata_codec_ids[] = {
302 };
303 
305  .name = "mpeg2_metadata",
306  .priv_data_size = sizeof(MPEG2MetadataContext),
307  .priv_class = &mpeg2_metadata_class,
309  .close = &mpeg2_metadata_close,
312 };
#define NULL
Definition: coverity.c:32
int nb_units
Number of units in this fragment.
Definition: cbs.h:147
uint8_t extension_start_code_identifier
Definition: cbs_mpeg2.h:179
AVCodecParameters * par_out
Parameters of the output stream.
Definition: avcodec.h:5797
#define se(name, range_min, range_max)
Definition: cbs_h2645.c:263
AVOption.
Definition: opt.h:246
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
int ff_cbs_write_packet(CodedBitstreamContext *ctx, AVPacket *pkt, CodedBitstreamFragment *frag)
Write the bitstream of a fragment to a packet.
Definition: cbs.c:401
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
MPEG2RawSequenceExtension sequence
Definition: cbs_mpeg2.h:182
int ff_cbs_init(CodedBitstreamContext **ctx_ptr, enum AVCodecID codec_id, void *log_ctx)
Create and initialise a new context for the given codec.
Definition: cbs.c:74
CodedBitstreamUnitType type
Codec-specific type of this unit.
Definition: cbs.h:68
int num
Numerator.
Definition: rational.h:59
The bitstream filter state.
Definition: avcodec.h:5763
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:191
int ff_cbs_insert_unit_content(CodedBitstreamContext *ctx, CodedBitstreamFragment *frag, int position, CodedBitstreamUnitType type, void *content, AVBufferRef *content_buf)
Insert a new unit into a fragment with the given content.
Definition: cbs.c:722
static AVPacket pkt
void * priv_data
Opaque filter-specific private data.
Definition: avcodec.h:5784
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:72
uint16_t vertical_size_value
Definition: cbs_mpeg2.h:63
static void filter(int16_t *output, ptrdiff_t out_stride, int16_t *low, ptrdiff_t low_stride, int16_t *high, ptrdiff_t high_stride, int len, int clip)
Definition: cfhd.c:153
AVOptions.
#define VALIDITY_CHECK(name)
int ff_cbs_read_packet(CodedBitstreamContext *ctx, CodedBitstreamFragment *frag, const AVPacket *pkt)
Read the data bitstream from a packet into a fragment, then split into units and decompose.
Definition: cbs.c:242
const char * name
Definition: avcodec.h:5813
int av_reduce(int *dst_num, int *dst_den, int64_t num, int64_t den, int64_t max)
Reduce a fraction.
Definition: rational.c:35
void * content
Pointer to the decomposed form of this unit.
Definition: cbs.h:101
CodedBitstreamUnit * units
Pointer to an array of units of length nb_units_allocated.
Definition: cbs.h:162
#define av_log(a,...)
void ff_cbs_fragment_free(CodedBitstreamContext *ctx, CodedBitstreamFragment *frag)
Free the units array of a fragment in addition to what ff_cbs_fragment_reset does.
Definition: cbs.c:157
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:259
AVCodecID
Identify the syntax and semantics of the bitstream.
Definition: avcodec.h:215
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
void ff_mpeg12_find_best_frame_rate(AVRational frame_rate, int *code, int *ext_n, int *ext_d, int nonstandard)
#define fail()
Definition: checkasm.h:120
static void mpeg2_metadata_close(AVBSFContext *bsf)
const AVBitStreamFilter ff_mpeg2_metadata_bsf
int ff_cbs_write_extradata(CodedBitstreamContext *ctx, AVCodecParameters *par, CodedBitstreamFragment *frag)
Write the bitstream of a fragment to the extradata in codec parameters.
Definition: cbs.c:376
MPEG2RawExtensionData sequence_display_extension
AVFormatContext * ctx
Definition: movenc.c:48
uint8_t horizontal_size_extension
Definition: cbs_mpeg2.h:88
preferred ID for MPEG-1/2 video decoding
Definition: avcodec.h:220
union MPEG2RawExtensionData::@62 data
MPEG2RawSequenceDisplayExtension sequence_display
Definition: cbs_mpeg2.h:183
Coded bitstream fragment structure, combining one or more units.
Definition: cbs.h:116
#define FLAGS
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:599
static const AVClass mpeg2_metadata_class
uint8_t frame_rate_extension_n
Definition: cbs_mpeg2.h:93
uint8_t frame_rate_extension_d
Definition: cbs_mpeg2.h:94
static enum AVCodecID mpeg2_metadata_codec_ids[]
Describe the class of an AVClass context structure.
Definition: log.h:67
void ff_cbs_fragment_reset(CodedBitstreamContext *ctx, CodedBitstreamFragment *frag)
Free the units contained in a fragment as well as the fragment&#39;s own data buffer, but not the units a...
Definition: cbs.c:142
Context structure for coded bitstream operations.
Definition: cbs.h:168
Rational number (pair of numerator and denominator).
Definition: rational.h:58
uint8_t extension_start_code
Definition: cbs_mpeg2.h:178
uint16_t horizontal_size_value
Definition: cbs_mpeg2.h:62
void ff_cbs_close(CodedBitstreamContext **ctx_ptr)
Close a context and free all internal state.
Definition: cbs.c:115
uint8_t aspect_ratio_information
Definition: cbs_mpeg2.h:64
int ff_cbs_read_extradata(CodedBitstreamContext *ctx, CodedBitstreamFragment *frag, const AVCodecParameters *par)
Read the extradata bitstream found in codec parameters into a fragment, then split into units and dec...
Definition: cbs.c:224
CodedBitstreamContext * cbc
CodedBitstreamFragment fragment
static int mpeg2_metadata_filter(AVBSFContext *bsf, AVPacket *pkt)
common internal and external API header
static enum AVCodecID codec_ids[]
int den
Denominator.
Definition: rational.h:60
static const AVOption mpeg2_metadata_options[]
uint8_t vertical_size_extension
Definition: cbs_mpeg2.h:89
static int mpeg2_metadata_update_fragment(AVBSFContext *bsf, CodedBitstreamFragment *frag)
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: avcodec.h:3971
#define OFFSET(x)
static int mpeg2_metadata_init(AVBSFContext *bsf)
This structure stores compressed data.
Definition: avcodec.h:1454
AVCodecParameters * par_in
Parameters of the input stream.
Definition: avcodec.h:5791
int ff_bsf_get_packet_ref(AVBSFContext *ctx, AVPacket *pkt)
Called by bitstream filters to get packet for filtering.
Definition: bsf.c:239