FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/bsf/h264_mp4toannexb.c
Date: 2024-07-14 13:34:57
Exec Total Coverage
Lines: 175 219 79.9%
Functions: 7 8 87.5%
Branches: 98 138 71.0%

Line Branch Exec Source
1 /*
2 * H.264 MP4 to Annex B byte stream format filter
3 * Copyright (c) 2007 Benoit Fouet <benoit.fouet@free.fr>
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 #include <string.h>
23
24 #include "libavutil/avassert.h"
25 #include "libavutil/intreadwrite.h"
26 #include "libavutil/mem.h"
27
28 #include "bsf.h"
29 #include "bsf_internal.h"
30 #include "bytestream.h"
31 #include "defs.h"
32 #include "h264.h"
33
34 typedef struct H264BSFContext {
35 uint8_t *sps;
36 uint8_t *pps;
37 int sps_size;
38 int pps_size;
39 unsigned sps_buf_size;
40 unsigned pps_buf_size;
41 uint8_t length_size;
42 uint8_t new_idr;
43 uint8_t idr_sps_seen;
44 uint8_t idr_pps_seen;
45 int extradata_parsed;
46 } H264BSFContext;
47
48 enum PsSource {
49 PS_OUT_OF_BAND = -1,
50 PS_NONE = 0,
51 PS_IN_BAND = 1,
52 };
53
54 3578 static void count_or_copy(uint8_t **out, uint64_t *out_size,
55 const uint8_t *in, int in_size, enum PsSource ps, int copy)
56 {
57 uint8_t start_code_size;
58
59
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3578 if (ps == PS_OUT_OF_BAND)
60 /* start code already present in out-of-band ps data, so don't need to
61 * add it manually again
62 */
63 68 start_code_size = 0;
64
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3510 else if (ps == PS_IN_BAND || *out_size == 0)
65 824 start_code_size = 4;
66 else
67 2686 start_code_size = 3;
68
69
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3578 if (copy) {
70 1789 memcpy(*out + start_code_size, in, in_size);
71
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1789 if (start_code_size == 4) {
72 412 AV_WB32(*out, 1);
73
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1377 } else if (start_code_size) {
74 1343 (*out)[0] =
75 1343 (*out)[1] = 0;
76 1343 (*out)[2] = 1;
77 }
78 1789 *out += start_code_size + in_size;
79 }
80 3578 *out_size += start_code_size + in_size;
81 3578 }
82
83 10 static int h264_extradata_to_annexb(AVBSFContext *ctx,
84 uint8_t *extradata, int extradata_size)
85 {
86 10 H264BSFContext *s = ctx->priv_data;
87 10 GetByteContext ogb, *gb = &ogb;
88 uint16_t unit_size;
89 10 uint32_t total_size = 0;
90 10 uint8_t *out = NULL, unit_nb, sps_done = 0;
91 static const uint8_t nalu_header[4] = { 0, 0, 0, 1 };
92 10 const int padding = AV_INPUT_BUFFER_PADDING_SIZE;
93 10 int length_size, pps_offset = 0;
94
95 10 bytestream2_init(gb, extradata, extradata_size);
96
97 10 bytestream2_skipu(gb, 4);
98
99 /* retrieve length coded size */
100 10 length_size = (bytestream2_get_byteu(gb) & 0x3) + 1;
101
102 /* retrieve sps and pps unit(s) */
103 10 unit_nb = bytestream2_get_byteu(gb) & 0x1f; /* number of sps unit(s) */
104
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10 if (!unit_nb) {
105 goto pps;
106 }
107
108
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30 while (unit_nb--) {
109 int err;
110
111 /* possible overread ok due to padding */
112 20 unit_size = bytestream2_get_be16u(gb);
113 20 total_size += unit_size + 4;
114 av_assert1(total_size <= INT_MAX - padding);
115
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20 if (bytestream2_get_bytes_left(gb) < unit_size + !sps_done) {
116 av_log(ctx, AV_LOG_ERROR, "Global extradata truncated, "
117 "corrupted stream or invalid MP4/AVCC bitstream\n");
118 av_free(out);
119 return AVERROR_INVALIDDATA;
120 }
121
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20 if ((err = av_reallocp(&out, total_size + padding)) < 0)
122 return err;
123 20 memcpy(out + total_size - unit_size - 4, nalu_header, 4);
124 20 bytestream2_get_bufferu(gb, out + total_size - unit_size, unit_size);
125 20 pps:
126
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20 if (!unit_nb && !sps_done++) {
127 10 unit_nb = bytestream2_get_byteu(gb); /* number of pps unit(s) */
128 10 pps_offset = total_size;
129 }
130 }
131
132
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10 if (out)
133 10 memset(out + total_size, 0, padding);
134
135
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10 if (pps_offset) {
136 uint8_t *sps;
137
138 10 s->sps_size = pps_offset;
139 10 sps = av_fast_realloc(s->sps, &s->sps_buf_size, s->sps_size);
140
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10 if (!sps) {
141 av_free(out);
142 return AVERROR(ENOMEM);
143 }
144 10 s->sps = sps;
145 10 memcpy(s->sps, out, s->sps_size);
146 } else {
147 av_log(ctx, AV_LOG_WARNING,
148 "Warning: SPS NALU missing or invalid. "
149 "The resulting stream may not play.\n");
150 }
151
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10 if (pps_offset < total_size) {
152 uint8_t *pps;
153
154 10 s->pps_size = total_size - pps_offset;
155 10 pps = av_fast_realloc(s->pps, &s->pps_buf_size, s->pps_size);
156
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10 if (!pps) {
157 av_freep(&s->sps);
158 av_free(out);
159 return AVERROR(ENOMEM);
160 }
161 10 s->pps = pps;
162 10 memcpy(s->pps, out + pps_offset, s->pps_size);
163 } else {
164 av_log(ctx, AV_LOG_WARNING,
165 "Warning: PPS NALU missing or invalid. "
166 "The resulting stream may not play.\n");
167 }
168
169 10 av_freep(&ctx->par_out->extradata);
170 10 ctx->par_out->extradata = out;
171 10 ctx->par_out->extradata_size = total_size;
172
173 10 s->length_size = length_size;
174 10 s->new_idr = 1;
175 10 s->idr_sps_seen = 0;
176 10 s->idr_pps_seen = 0;
177 10 s->extradata_parsed = 1;
178
179 10 return 0;
180 }
181
182 2 static int h264_mp4toannexb_save_ps(uint8_t **dst, int *dst_size,
183 unsigned *dst_buf_size,
184 const uint8_t *nal, uint32_t nal_size,
185 int first)
186 {
187 static const uint8_t nalu_header[4] = { 0, 0, 0, 1 };
188 2 const int start_code_size = sizeof(nalu_header);
189 uint8_t *ptr;
190 uint32_t size;
191
192
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2 if (first)
193 2 size = 0;
194 else
195 size = *dst_size;
196
197 2 ptr = av_fast_realloc(*dst, dst_buf_size, size + nal_size + start_code_size);
198
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2 if (!ptr)
199 return AVERROR(ENOMEM);
200
201 2 memcpy(ptr + size, nalu_header, start_code_size);
202 2 size += start_code_size;
203 2 memcpy(ptr + size, nal, nal_size);
204 2 size += nal_size;
205
206 2 *dst = ptr;
207 2 *dst_size = size;
208 2 return 0;
209 }
210
211 412 static int h264_mp4toannexb_filter_ps(H264BSFContext *s,
212 const uint8_t *buf,
213 const uint8_t *buf_end)
214 {
215 412 int sps_count = 0;
216 412 int pps_count = 0;
217 uint8_t unit_type;
218
219 do {
220 1760 uint32_t nal_size = 0;
221
222 /* possible overread ok due to padding */
223
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8800 for (int i = 0; i < s->length_size; i++)
224 7040 nal_size = (nal_size << 8) | buf[i];
225
226 1760 buf += s->length_size;
227
228 /* This check requires the cast as the right side might
229 * otherwise be promoted to an unsigned value. */
230
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1760 if ((int64_t)nal_size > buf_end - buf)
231 1 return AVERROR_INVALIDDATA;
232
233
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1759 if (!nal_size)
234 continue;
235
236 1759 unit_type = *buf & 0x1f;
237
238
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1759 if (unit_type == H264_NAL_SPS) {
239 1 h264_mp4toannexb_save_ps(&s->sps, &s->sps_size, &s->sps_buf_size, buf,
240 nal_size, !sps_count);
241 1 sps_count++;
242
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1758 } else if (unit_type == H264_NAL_PPS) {
243 1 h264_mp4toannexb_save_ps(&s->pps, &s->pps_size, &s->pps_buf_size, buf,
244 nal_size, !pps_count);
245 1 pps_count++;
246 }
247
248 1759 buf += nal_size;
249
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1759 } while (buf < buf_end);
250
251 411 return 0;
252 }
253
254 7 static int h264_mp4toannexb_init(AVBSFContext *ctx)
255 {
256 7 int extra_size = ctx->par_in->extradata_size;
257
258 /* retrieve sps and pps NAL units from extradata */
259
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7 if (!extra_size ||
260
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7 (extra_size >= 3 && AV_RB24(ctx->par_in->extradata) == 1) ||
261
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7 (extra_size >= 4 && AV_RB32(ctx->par_in->extradata) == 1)) {
262 av_log(ctx, AV_LOG_VERBOSE,
263 "The input looks like it is Annex B already\n");
264
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7 } else if (extra_size >= 7) {
265 7 return h264_extradata_to_annexb(ctx,
266 7 ctx->par_in->extradata,
267 7 ctx->par_in->extradata_size);
268 } else {
269 av_log(ctx, AV_LOG_ERROR, "Invalid extradata size: %d\n", extra_size);
270 return AVERROR_INVALIDDATA;
271 }
272
273 return 0;
274 }
275
276 831 static int h264_mp4toannexb_filter(AVBSFContext *ctx, AVPacket *opkt)
277 {
278 831 H264BSFContext *s = ctx->priv_data;
279 AVPacket *in;
280 uint8_t unit_type, new_idr, sps_seen, pps_seen;
281 const uint8_t *buf;
282 const uint8_t *buf_end;
283 uint8_t *out;
284 uint64_t out_size;
285 int ret;
286 size_t extradata_size;
287 uint8_t *extradata;
288
289 831 ret = ff_bsf_get_packet(ctx, &in);
290
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831 if (ret < 0)
291 419 return ret;
292
293 412 extradata = av_packet_get_side_data(in, AV_PKT_DATA_NEW_EXTRADATA,
294 &extradata_size);
295
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412 if (extradata) {
296 3 ret = h264_extradata_to_annexb(ctx, extradata, extradata_size);
297
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3 if (ret < 0)
298 goto fail;
299 }
300
301 /* nothing to filter */
302
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412 if (!s->extradata_parsed) {
303 av_packet_move_ref(opkt, in);
304 av_packet_free(&in);
305 return 0;
306 }
307
308 412 buf_end = in->data + in->size;
309 412 ret = h264_mp4toannexb_filter_ps(s, in->data, buf_end);
310
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412 if (ret < 0)
311 1 goto fail;
312
313 #define LOG_ONCE(...) \
314 if (j) \
315 av_log(__VA_ARGS__)
316
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1233 for (int j = 0; j < 2; j++) {
317 822 buf = in->data;
318 822 new_idr = s->new_idr;
319 822 sps_seen = s->idr_sps_seen;
320 822 pps_seen = s->idr_pps_seen;
321 822 out_size = 0;
322
323 do {
324 3510 uint32_t nal_size = 0;
325 enum PsSource ps;
326
327 /* possible overread ok due to padding */
328
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17550 for (int i = 0; i < s->length_size; i++)
329 14040 nal_size = (nal_size << 8) | buf[i];
330
331 3510 buf += s->length_size;
332
333 /* This check requires the cast as the right side might
334 * otherwise be promoted to an unsigned value. */
335
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3510 if ((int64_t)nal_size > buf_end - buf) {
336 ret = AVERROR_INVALIDDATA;
337 goto fail;
338 }
339
340
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3510 if (!nal_size)
341 continue;
342
343 3510 unit_type = *buf & 0x1f;
344
345
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3510 if (unit_type == H264_NAL_SPS) {
346 2 sps_seen = new_idr = 1;
347
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3508 } else if (unit_type == H264_NAL_PPS) {
348 2 pps_seen = new_idr = 1;
349 /* if SPS has not been seen yet, prepend the AVCC one to PPS */
350
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2 if (!sps_seen) {
351 if (!s->sps_size) {
352 LOG_ONCE(ctx, AV_LOG_WARNING, "SPS not present in the stream, nor in AVCC, stream may be unreadable\n");
353 } else {
354 count_or_copy(&out, &out_size, s->sps, s->sps_size, PS_OUT_OF_BAND, j);
355 sps_seen = 1;
356 }
357 }
358 }
359
360 /* If this is a new IDR picture following an IDR picture, reset the idr flag.
361 * Just check first_mb_in_slice to be 0 as this is the simplest solution.
362 * This could be checking idr_pic_id instead, but would complexify the parsing. */
363
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3510 if (!new_idr && unit_type == H264_NAL_IDR_SLICE && (buf[1] & 0x80))
364 new_idr = 1;
365
366 /* prepend only to the first type 5 NAL unit of an IDR picture, if no sps/pps are already present */
367
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3510 if (new_idr && unit_type == H264_NAL_IDR_SLICE && !sps_seen && !pps_seen) {
368
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34 if (s->sps_size)
369 34 count_or_copy(&out, &out_size, s->sps, s->sps_size, PS_OUT_OF_BAND, j);
370
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34 if (s->pps_size)
371 34 count_or_copy(&out, &out_size, s->pps, s->pps_size, PS_OUT_OF_BAND, j);
372 34 new_idr = 0;
373 /* if only SPS has been seen, also insert PPS */
374
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3476 } else if (new_idr && unit_type == H264_NAL_IDR_SLICE && sps_seen && !pps_seen) {
375 if (!s->pps_size) {
376 LOG_ONCE(ctx, AV_LOG_WARNING, "PPS not present in the stream, nor in AVCC, stream may be unreadable\n");
377 } else {
378 count_or_copy(&out, &out_size, s->pps, s->pps_size, PS_OUT_OF_BAND, j);
379 }
380 }
381
382
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3510 if (unit_type == H264_NAL_SPS || unit_type == H264_NAL_PPS)
383 4 ps = PS_IN_BAND;
384 else
385 3506 ps = PS_NONE;
386 3510 count_or_copy(&out, &out_size, buf, nal_size, ps, j);
387
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3510 if (unit_type == H264_NAL_SLICE) {
388 1760 new_idr = 1;
389 1760 sps_seen = 0;
390 1760 pps_seen = 0;
391 }
392
393 3510 buf += nal_size;
394
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3510 } while (buf < buf_end);
395
396
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822 if (!j) {
397
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411 if (out_size > INT_MAX - AV_INPUT_BUFFER_PADDING_SIZE) {
398 ret = AVERROR_INVALIDDATA;
399 goto fail;
400 }
401 411 ret = av_new_packet(opkt, out_size);
402
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411 if (ret < 0)
403 goto fail;
404 411 out = opkt->data;
405 }
406 }
407 #undef LOG_ONCE
408
409 av_assert1(out_size == opkt->size);
410
411 411 s->new_idr = new_idr;
412 411 s->idr_sps_seen = sps_seen;
413 411 s->idr_pps_seen = pps_seen;
414
415 411 ret = av_packet_copy_props(opkt, in);
416
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411 if (ret < 0)
417 goto fail;
418
419 411 fail:
420
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412 if (ret < 0)
421 1 av_packet_unref(opkt);
422 412 av_packet_free(&in);
423
424 412 return ret;
425 }
426
427 7 static void h264_mp4toannexb_close(AVBSFContext *ctx)
428 {
429 7 H264BSFContext *s = ctx->priv_data;
430
431 7 av_freep(&s->sps);
432 7 av_freep(&s->pps);
433 7 }
434
435 static void h264_mp4toannexb_flush(AVBSFContext *ctx)
436 {
437 H264BSFContext *s = ctx->priv_data;
438
439 s->idr_sps_seen = 0;
440 s->idr_pps_seen = 0;
441 s->new_idr = s->extradata_parsed;
442 }
443
444 static const enum AVCodecID codec_ids[] = {
445 AV_CODEC_ID_H264, AV_CODEC_ID_NONE,
446 };
447
448 const FFBitStreamFilter ff_h264_mp4toannexb_bsf = {
449 .p.name = "h264_mp4toannexb",
450 .p.codec_ids = codec_ids,
451 .priv_data_size = sizeof(H264BSFContext),
452 .init = h264_mp4toannexb_init,
453 .filter = h264_mp4toannexb_filter,
454 .close = h264_mp4toannexb_close,
455 .flush = h264_mp4toannexb_flush,
456 };
457