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 <stdint.h>
20
21 #include "libavutil/log.h"
22 #include "libavutil/opt.h"
23
24 #include "av1.h"
25 #include "av1_parse.h"
26 #include "bsf.h"
27 #include "bsf_internal.h"
28 #include "bytestream.h"
29 #include "h2645_parse.h"
30 #include "h264.h"
31 #include "hevc.h"
32 #include "startcode.h"
33 #include "vc1_common.h"
34
35 typedef struct ExtractExtradataContext {
36 const AVClass *class;
37
38 int (*extract)(AVBSFContext *ctx, AVPacket *pkt,
39 uint8_t **data, int *size);
40
41 /* AV1 specific fields */
42 AV1Packet av1_pkt;
43
44 /* H264/HEVC specific fields */
45 H2645Packet h2645_pkt;
46
47 /* AVOptions */
48 int remove;
49 } ExtractExtradataContext;
50
val_in_array(const int *arr, int len, int val)51 static int val_in_array(const int *arr, int len, int val)
52 {
53 int i;
54 for (i = 0; i < len; i++)
55 if (arr[i] == val)
56 return 1;
57 return 0;
58 }
59
extract_extradata_av1(AVBSFContext *ctx, AVPacket *pkt, uint8_t **data, int *size)60 static int extract_extradata_av1(AVBSFContext *ctx, AVPacket *pkt,
61 uint8_t **data, int *size)
62 {
63 static const int extradata_obu_types[] = {
64 AV1_OBU_SEQUENCE_HEADER, AV1_OBU_METADATA,
65 };
66 ExtractExtradataContext *s = ctx->priv_data;
67
68 int extradata_size = 0, filtered_size = 0;
69 int nb_extradata_obu_types = FF_ARRAY_ELEMS(extradata_obu_types);
70 int i, has_seq = 0, ret = 0;
71
72 ret = ff_av1_packet_split(&s->av1_pkt, pkt->data, pkt->size, ctx);
73 if (ret < 0)
74 return ret;
75
76 for (i = 0; i < s->av1_pkt.nb_obus; i++) {
77 AV1OBU *obu = &s->av1_pkt.obus[i];
78 if (val_in_array(extradata_obu_types, nb_extradata_obu_types, obu->type)) {
79 extradata_size += obu->raw_size;
80 if (obu->type == AV1_OBU_SEQUENCE_HEADER)
81 has_seq = 1;
82 } else if (s->remove) {
83 filtered_size += obu->raw_size;
84 }
85 }
86
87 if (extradata_size && has_seq) {
88 AVBufferRef *filtered_buf = NULL;
89 PutByteContext pb_filtered_data, pb_extradata;
90 uint8_t *extradata;
91
92 if (s->remove) {
93 filtered_buf = av_buffer_alloc(filtered_size + AV_INPUT_BUFFER_PADDING_SIZE);
94 if (!filtered_buf) {
95 return AVERROR(ENOMEM);
96 }
97 memset(filtered_buf->data + filtered_size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
98 }
99
100 extradata = av_malloc(extradata_size + AV_INPUT_BUFFER_PADDING_SIZE);
101 if (!extradata) {
102 av_buffer_unref(&filtered_buf);
103 return AVERROR(ENOMEM);
104 }
105
106 *data = extradata;
107 *size = extradata_size;
108
109 bytestream2_init_writer(&pb_extradata, extradata, extradata_size);
110 if (s->remove)
111 bytestream2_init_writer(&pb_filtered_data, filtered_buf->data, filtered_size);
112
113 for (i = 0; i < s->av1_pkt.nb_obus; i++) {
114 AV1OBU *obu = &s->av1_pkt.obus[i];
115 if (val_in_array(extradata_obu_types, nb_extradata_obu_types,
116 obu->type)) {
117 bytestream2_put_bufferu(&pb_extradata, obu->raw_data, obu->raw_size);
118 } else if (s->remove) {
119 bytestream2_put_bufferu(&pb_filtered_data, obu->raw_data, obu->raw_size);
120 }
121 }
122
123 if (s->remove) {
124 av_buffer_unref(&pkt->buf);
125 pkt->buf = filtered_buf;
126 pkt->data = filtered_buf->data;
127 pkt->size = filtered_size;
128 }
129 }
130
131 return 0;
132 }
133
extract_extradata_h2645(AVBSFContext *ctx, AVPacket *pkt, uint8_t **data, int *size)134 static int extract_extradata_h2645(AVBSFContext *ctx, AVPacket *pkt,
135 uint8_t **data, int *size)
136 {
137 static const int extradata_nal_types_hevc[] = {
138 HEVC_NAL_VPS, HEVC_NAL_SPS, HEVC_NAL_PPS,
139 };
140 static const int extradata_nal_types_h264[] = {
141 H264_NAL_SPS, H264_NAL_PPS,
142 };
143
144 ExtractExtradataContext *s = ctx->priv_data;
145
146 int extradata_size = 0, filtered_size = 0;
147 const int *extradata_nal_types;
148 int nb_extradata_nal_types;
149 int i, has_sps = 0, has_vps = 0, ret = 0;
150
151 if (ctx->par_in->codec_id == AV_CODEC_ID_HEVC) {
152 extradata_nal_types = extradata_nal_types_hevc;
153 nb_extradata_nal_types = FF_ARRAY_ELEMS(extradata_nal_types_hevc);
154 } else {
155 extradata_nal_types = extradata_nal_types_h264;
156 nb_extradata_nal_types = FF_ARRAY_ELEMS(extradata_nal_types_h264);
157 }
158
159 ret = ff_h2645_packet_split(&s->h2645_pkt, pkt->data, pkt->size,
160 ctx, 0, 0, ctx->par_in->codec_id, 1, 0);
161 if (ret < 0)
162 return ret;
163
164 for (i = 0; i < s->h2645_pkt.nb_nals; i++) {
165 H2645NAL *nal = &s->h2645_pkt.nals[i];
166 if (val_in_array(extradata_nal_types, nb_extradata_nal_types, nal->type)) {
167 extradata_size += nal->raw_size + 3;
168 if (ctx->par_in->codec_id == AV_CODEC_ID_HEVC) {
169 if (nal->type == HEVC_NAL_SPS) has_sps = 1;
170 if (nal->type == HEVC_NAL_VPS) has_vps = 1;
171 } else {
172 if (nal->type == H264_NAL_SPS) has_sps = 1;
173 }
174 } else if (s->remove) {
175 filtered_size += nal->raw_size + 3;
176 }
177 }
178
179 if (extradata_size &&
180 ((ctx->par_in->codec_id == AV_CODEC_ID_HEVC && has_sps && has_vps) ||
181 (ctx->par_in->codec_id == AV_CODEC_ID_H264 && has_sps))) {
182 AVBufferRef *filtered_buf = NULL;
183 PutByteContext pb_filtered_data, pb_extradata;
184 uint8_t *extradata;
185
186 if (s->remove) {
187 filtered_buf = av_buffer_alloc(filtered_size + AV_INPUT_BUFFER_PADDING_SIZE);
188 if (!filtered_buf) {
189 return AVERROR(ENOMEM);
190 }
191 memset(filtered_buf->data + filtered_size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
192 }
193
194 extradata = av_malloc(extradata_size + AV_INPUT_BUFFER_PADDING_SIZE);
195 if (!extradata) {
196 av_buffer_unref(&filtered_buf);
197 return AVERROR(ENOMEM);
198 }
199
200 *data = extradata;
201 *size = extradata_size;
202
203 bytestream2_init_writer(&pb_extradata, extradata, extradata_size);
204 if (s->remove)
205 bytestream2_init_writer(&pb_filtered_data, filtered_buf->data, filtered_size);
206
207 for (i = 0; i < s->h2645_pkt.nb_nals; i++) {
208 H2645NAL *nal = &s->h2645_pkt.nals[i];
209 if (val_in_array(extradata_nal_types, nb_extradata_nal_types,
210 nal->type)) {
211 bytestream2_put_be24u(&pb_extradata, 1); //startcode
212 bytestream2_put_bufferu(&pb_extradata, nal->raw_data, nal->raw_size);
213 } else if (s->remove) {
214 bytestream2_put_be24u(&pb_filtered_data, 1); // startcode
215 bytestream2_put_bufferu(&pb_filtered_data, nal->raw_data, nal->raw_size);
216 }
217 }
218
219 if (s->remove) {
220 av_buffer_unref(&pkt->buf);
221 pkt->buf = filtered_buf;
222 pkt->data = filtered_buf->data;
223 pkt->size = filtered_size;
224 }
225 }
226
227 return 0;
228 }
229
extract_extradata_vc1(AVBSFContext *ctx, AVPacket *pkt, uint8_t **data, int *size)230 static int extract_extradata_vc1(AVBSFContext *ctx, AVPacket *pkt,
231 uint8_t **data, int *size)
232 {
233 ExtractExtradataContext *s = ctx->priv_data;
234 const uint8_t *ptr = pkt->data, *end = pkt->data + pkt->size;
235 uint32_t state = UINT32_MAX;
236 int has_extradata = 0, extradata_size = 0;
237
238 while (ptr < end) {
239 ptr = avpriv_find_start_code(ptr, end, &state);
240 if (state == VC1_CODE_SEQHDR || state == VC1_CODE_ENTRYPOINT) {
241 has_extradata = 1;
242 } else if (has_extradata && IS_MARKER(state)) {
243 extradata_size = ptr - 4 - pkt->data;
244 break;
245 }
246 }
247
248 if (extradata_size) {
249 *data = av_malloc(extradata_size + AV_INPUT_BUFFER_PADDING_SIZE);
250 if (!*data)
251 return AVERROR(ENOMEM);
252
253 memcpy(*data, pkt->data, extradata_size);
254 *size = extradata_size;
255
256 if (s->remove) {
257 pkt->data += extradata_size;
258 pkt->size -= extradata_size;
259 }
260 }
261
262 return 0;
263 }
264
extract_extradata_mpeg12(AVBSFContext *ctx, AVPacket *pkt, uint8_t **data, int *size)265 static int extract_extradata_mpeg12(AVBSFContext *ctx, AVPacket *pkt,
266 uint8_t **data, int *size)
267 {
268 ExtractExtradataContext *s = ctx->priv_data;
269 uint32_t state = UINT32_MAX;
270 int i, found = 0;
271
272 for (i = 0; i < pkt->size; i++) {
273 state = (state << 8) | pkt->data[i];
274 if (state == 0x1B3)
275 found = 1;
276 else if (found && state != 0x1B5 && state < 0x200 && state >= 0x100) {
277 *size = i - 3;
278 *data = av_malloc(*size + AV_INPUT_BUFFER_PADDING_SIZE);
279 if (!*data)
280 return AVERROR(ENOMEM);
281
282 memcpy(*data, pkt->data, *size);
283
284 if (s->remove) {
285 pkt->data += *size;
286 pkt->size -= *size;
287 }
288 break;
289 }
290 }
291 return 0;
292 }
293
extract_extradata_mpeg4(AVBSFContext *ctx, AVPacket *pkt, uint8_t **data, int *size)294 static int extract_extradata_mpeg4(AVBSFContext *ctx, AVPacket *pkt,
295 uint8_t **data, int *size)
296 {
297 ExtractExtradataContext *s = ctx->priv_data;
298 const uint8_t *ptr = pkt->data, *end = pkt->data + pkt->size;
299 uint32_t state = UINT32_MAX;
300
301 while (ptr < end) {
302 ptr = avpriv_find_start_code(ptr, end, &state);
303 if (state == 0x1B3 || state == 0x1B6) {
304 if (ptr - pkt->data > 4) {
305 *size = ptr - 4 - pkt->data;
306 *data = av_malloc(*size + AV_INPUT_BUFFER_PADDING_SIZE);
307 if (!*data)
308 return AVERROR(ENOMEM);
309
310 memcpy(*data, pkt->data, *size);
311
312 if (s->remove) {
313 pkt->data += *size;
314 pkt->size -= *size;
315 }
316 }
317 break;
318 }
319 }
320 return 0;
321 }
322
323 static const struct {
324 enum AVCodecID id;
325 int (*extract)(AVBSFContext *ctx, AVPacket *pkt,
326 uint8_t **data, int *size);
327 } extract_tab[] = {
328 { AV_CODEC_ID_AV1, extract_extradata_av1 },
329 { AV_CODEC_ID_AVS2, extract_extradata_mpeg4 },
330 { AV_CODEC_ID_AVS3, extract_extradata_mpeg4 },
331 { AV_CODEC_ID_CAVS, extract_extradata_mpeg4 },
332 { AV_CODEC_ID_H264, extract_extradata_h2645 },
333 { AV_CODEC_ID_HEVC, extract_extradata_h2645 },
334 { AV_CODEC_ID_MPEG1VIDEO, extract_extradata_mpeg12 },
335 { AV_CODEC_ID_MPEG2VIDEO, extract_extradata_mpeg12 },
336 { AV_CODEC_ID_MPEG4, extract_extradata_mpeg4 },
337 { AV_CODEC_ID_VC1, extract_extradata_vc1 },
338 };
339
extract_extradata_init(AVBSFContext *ctx)340 static int extract_extradata_init(AVBSFContext *ctx)
341 {
342 ExtractExtradataContext *s = ctx->priv_data;
343 int i;
344
345 for (i = 0; i < FF_ARRAY_ELEMS(extract_tab); i++) {
346 if (extract_tab[i].id == ctx->par_in->codec_id) {
347 s->extract = extract_tab[i].extract;
348 break;
349 }
350 }
351 if (!s->extract)
352 return AVERROR_BUG;
353
354 return 0;
355 }
356
extract_extradata_filter(AVBSFContext *ctx, AVPacket *pkt)357 static int extract_extradata_filter(AVBSFContext *ctx, AVPacket *pkt)
358 {
359 ExtractExtradataContext *s = ctx->priv_data;
360 uint8_t *extradata = NULL;
361 int extradata_size;
362 int ret = 0;
363
364 ret = ff_bsf_get_packet_ref(ctx, pkt);
365 if (ret < 0)
366 return ret;
367
368 ret = s->extract(ctx, pkt, &extradata, &extradata_size);
369 if (ret < 0)
370 goto fail;
371
372 if (extradata) {
373 memset(extradata + extradata_size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
374 ret = av_packet_add_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA,
375 extradata, extradata_size);
376 if (ret < 0) {
377 av_freep(&extradata);
378 goto fail;
379 }
380 }
381
382 return 0;
383
384 fail:
385 av_packet_unref(pkt);
386 return ret;
387 }
388
extract_extradata_close(AVBSFContext *ctx)389 static void extract_extradata_close(AVBSFContext *ctx)
390 {
391 ExtractExtradataContext *s = ctx->priv_data;
392 ff_av1_packet_uninit(&s->av1_pkt);
393 ff_h2645_packet_uninit(&s->h2645_pkt);
394 }
395
396 static const enum AVCodecID codec_ids[] = {
397 AV_CODEC_ID_AV1,
398 AV_CODEC_ID_AVS2,
399 AV_CODEC_ID_AVS3,
400 AV_CODEC_ID_CAVS,
401 AV_CODEC_ID_H264,
402 AV_CODEC_ID_HEVC,
403 AV_CODEC_ID_MPEG1VIDEO,
404 AV_CODEC_ID_MPEG2VIDEO,
405 AV_CODEC_ID_MPEG4,
406 AV_CODEC_ID_VC1,
407 AV_CODEC_ID_NONE,
408 };
409
410 #define OFFSET(x) offsetof(ExtractExtradataContext, x)
411 #define FLAGS (AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_BSF_PARAM)
412 static const AVOption options[] = {
413 { "remove", "remove the extradata from the bitstream", OFFSET(remove), AV_OPT_TYPE_INT,
414 { .i64 = 0 }, 0, 1, FLAGS },
415 { NULL },
416 };
417
418 static const AVClass extract_extradata_class = {
419 .class_name = "extract_extradata",
420 .item_name = av_default_item_name,
421 .option = options,
422 .version = LIBAVUTIL_VERSION_INT,
423 };
424
425 const FFBitStreamFilter ff_extract_extradata_bsf = {
426 .p.name = "extract_extradata",
427 .p.codec_ids = codec_ids,
428 .p.priv_class = &extract_extradata_class,
429 .priv_data_size = sizeof(ExtractExtradataContext),
430 .init = extract_extradata_init,
431 .filter = extract_extradata_filter,
432 .close = extract_extradata_close,
433 };
434