2 * This file is part of FFmpeg.
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.
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.
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
19 #include "libavutil/avassert.h"
22 #include "cbs_internal.h"
27 static int cbs_vp9_read_s(CodedBitstreamContext *ctx, GetBitContext *gbc,
28 int width, const char *name,
29 const int *subscripts, int32_t *write_to)
35 if (ctx->trace_enable)
36 position = get_bits_count(gbc);
38 if (get_bits_left(gbc) < width + 1) {
39 av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid signed value at "
40 "%s: bitstream ended.\n", name);
41 return AVERROR_INVALIDDATA;
44 magnitude = get_bits(gbc, width);
45 sign = get_bits1(gbc);
46 value = sign ? -(int32_t)magnitude : magnitude;
48 if (ctx->trace_enable) {
51 for (i = 0; i < width; i++)
52 bits[i] = magnitude >> (width - i - 1) & 1 ? '1' : '0';
53 bits[i] = sign ? '1' : '0';
56 ff_cbs_trace_syntax_element(ctx, position, name, subscripts,
64 static int cbs_vp9_write_s(CodedBitstreamContext *ctx, PutBitContext *pbc,
65 int width, const char *name,
66 const int *subscripts, int32_t value)
71 if (put_bits_left(pbc) < width + 1)
72 return AVERROR(ENOSPC);
75 magnitude = sign ? -value : value;
77 if (ctx->trace_enable) {
80 for (i = 0; i < width; i++)
81 bits[i] = magnitude >> (width - i - 1) & 1 ? '1' : '0';
82 bits[i] = sign ? '1' : '0';
85 ff_cbs_trace_syntax_element(ctx, put_bits_count(pbc),
86 name, subscripts, bits, value);
89 put_bits(pbc, width, magnitude);
90 put_bits(pbc, 1, sign);
95 static int cbs_vp9_read_increment(CodedBitstreamContext *ctx, GetBitContext *gbc,
96 uint32_t range_min, uint32_t range_max,
97 const char *name, uint32_t *write_to)
103 av_assert0(range_min <= range_max && range_max - range_min < sizeof(bits) - 1);
104 if (ctx->trace_enable)
105 position = get_bits_count(gbc);
107 for (i = 0, value = range_min; value < range_max;) {
108 if (get_bits_left(gbc) < 1) {
109 av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid increment value at "
110 "%s: bitstream ended.\n", name);
111 return AVERROR_INVALIDDATA;
113 if (get_bits1(gbc)) {
122 if (ctx->trace_enable) {
124 ff_cbs_trace_syntax_element(ctx, position, name, NULL, bits, value);
131 static int cbs_vp9_write_increment(CodedBitstreamContext *ctx, PutBitContext *pbc,
132 uint32_t range_min, uint32_t range_max,
133 const char *name, uint32_t value)
137 av_assert0(range_min <= range_max && range_max - range_min < 8);
138 if (value < range_min || value > range_max) {
139 av_log(ctx->log_ctx, AV_LOG_ERROR, "%s out of range: "
140 "%"PRIu32", but must be in [%"PRIu32",%"PRIu32"].\n",
141 name, value, range_min, range_max);
142 return AVERROR_INVALIDDATA;
145 if (value == range_max)
146 len = range_max - range_min;
148 len = value - range_min + 1;
149 if (put_bits_left(pbc) < len)
150 return AVERROR(ENOSPC);
152 if (ctx->trace_enable) {
155 for (i = 0; i < len; i++) {
156 if (range_min + i == value)
162 ff_cbs_trace_syntax_element(ctx, put_bits_count(pbc),
163 name, NULL, bits, value);
167 put_bits(pbc, len, (1 << len) - 1 - (value != range_max));
172 static int cbs_vp9_read_le(CodedBitstreamContext *ctx, GetBitContext *gbc,
173 int width, const char *name,
174 const int *subscripts, uint32_t *write_to)
179 av_assert0(width % 8 == 0);
181 if (ctx->trace_enable)
182 position = get_bits_count(gbc);
184 if (get_bits_left(gbc) < width) {
185 av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid le value at "
186 "%s: bitstream ended.\n", name);
187 return AVERROR_INVALIDDATA;
191 for (b = 0; b < width; b += 8)
192 value |= get_bits(gbc, 8) << b;
194 if (ctx->trace_enable) {
197 for (b = 0; b < width; b += 8)
198 for (i = 0; i < 8; i++)
199 bits[b + i] = value >> (b + i) & 1 ? '1' : '0';
202 ff_cbs_trace_syntax_element(ctx, position, name, subscripts,
210 static int cbs_vp9_write_le(CodedBitstreamContext *ctx, PutBitContext *pbc,
211 int width, const char *name,
212 const int *subscripts, uint32_t value)
216 av_assert0(width % 8 == 0);
218 if (put_bits_left(pbc) < width)
219 return AVERROR(ENOSPC);
221 if (ctx->trace_enable) {
224 for (b = 0; b < width; b += 8)
225 for (i = 0; i < 8; i++)
226 bits[b + i] = value >> (b + i) & 1 ? '1' : '0';
229 ff_cbs_trace_syntax_element(ctx, put_bits_count(pbc),
230 name, subscripts, bits, value);
233 for (b = 0; b < width; b += 8)
234 put_bits(pbc, 8, value >> b & 0xff);
239 #define HEADER(name) do { \
240 ff_cbs_trace_header(ctx, name); \
243 #define CHECK(call) do { \
249 #define FUNC_NAME(rw, codec, name) cbs_ ## codec ## _ ## rw ## _ ## name
250 #define FUNC_VP9(rw, name) FUNC_NAME(rw, vp9, name)
251 #define FUNC(name) FUNC_VP9(READWRITE, name)
253 #define SUBSCRIPTS(subs, ...) (subs > 0 ? ((int[subs + 1]){ subs, __VA_ARGS__ }) : NULL)
255 #define f(width, name) \
256 xf(width, name, current->name, 0, )
257 #define s(width, name) \
258 xs(width, name, current->name, 0, )
259 #define fs(width, name, subs, ...) \
260 xf(width, name, current->name, subs, __VA_ARGS__)
261 #define ss(width, name, subs, ...) \
262 xs(width, name, current->name, subs, __VA_ARGS__)
265 #define READWRITE read
266 #define RWContext GetBitContext
268 #define xf(width, name, var, subs, ...) do { \
270 CHECK(ff_cbs_read_unsigned(ctx, rw, width, #name, \
271 SUBSCRIPTS(subs, __VA_ARGS__), \
272 &value, 0, (1 << width) - 1)); \
275 #define xs(width, name, var, subs, ...) do { \
277 CHECK(cbs_vp9_read_s(ctx, rw, width, #name, \
278 SUBSCRIPTS(subs, __VA_ARGS__), &value)); \
283 #define increment(name, min, max) do { \
285 CHECK(cbs_vp9_read_increment(ctx, rw, min, max, #name, &value)); \
286 current->name = value; \
289 #define fle(width, name, subs, ...) do { \
290 CHECK(cbs_vp9_read_le(ctx, rw, width, #name, \
291 SUBSCRIPTS(subs, __VA_ARGS__), ¤t->name)); \
294 #define delta_q(name) do { \
295 uint8_t delta_coded; \
297 xf(1, name.delta_coded, delta_coded, 0, ); \
299 xs(4, name.delta_q, delta_q, 0, ); \
302 current->name = delta_q; \
305 #define prob(name, subs, ...) do { \
306 uint8_t prob_coded; \
308 xf(1, name.prob_coded, prob_coded, subs, __VA_ARGS__); \
310 xf(8, name.prob, prob, subs, __VA_ARGS__); \
313 current->name = prob; \
316 #define fixed(width, name, value) do { \
317 av_unused uint32_t fixed_value; \
318 CHECK(ff_cbs_read_unsigned(ctx, rw, width, #name, \
319 0, &fixed_value, value, value)); \
322 #define infer(name, value) do { \
323 current->name = value; \
326 #define byte_alignment(rw) (get_bits_count(rw) % 8)
328 #include "cbs_vp9_syntax_template.c"
341 #undef byte_alignment
345 #define READWRITE write
346 #define RWContext PutBitContext
348 #define xf(width, name, var, subs, ...) do { \
349 CHECK(ff_cbs_write_unsigned(ctx, rw, width, #name, \
350 SUBSCRIPTS(subs, __VA_ARGS__), \
351 var, 0, (1 << width) - 1)); \
353 #define xs(width, name, var, subs, ...) do { \
354 CHECK(cbs_vp9_write_s(ctx, rw, width, #name, \
355 SUBSCRIPTS(subs, __VA_ARGS__), var)); \
358 #define increment(name, min, max) do { \
359 CHECK(cbs_vp9_write_increment(ctx, rw, min, max, #name, current->name)); \
362 #define fle(width, name, subs, ...) do { \
363 CHECK(cbs_vp9_write_le(ctx, rw, width, #name, \
364 SUBSCRIPTS(subs, __VA_ARGS__), current->name)); \
367 #define delta_q(name) do { \
368 xf(1, name.delta_coded, !!current->name, 0, ); \
370 xs(4, name.delta_q, current->name, 0, ); \
373 #define prob(name, subs, ...) do { \
374 xf(1, name.prob_coded, current->name != 255, subs, __VA_ARGS__); \
375 if (current->name != 255) \
376 xf(8, name.prob, current->name, subs, __VA_ARGS__); \
379 #define fixed(width, name, value) do { \
380 CHECK(ff_cbs_write_unsigned(ctx, rw, width, #name, \
381 0, value, value, value)); \
384 #define infer(name, value) do { \
385 if (current->name != (value)) { \
386 av_log(ctx->log_ctx, AV_LOG_WARNING, "Warning: " \
387 "%s does not match inferred value: " \
388 "%"PRId64", but should be %"PRId64".\n", \
389 #name, (int64_t)current->name, (int64_t)(value)); \
393 #define byte_alignment(rw) (put_bits_count(rw) % 8)
395 #include "cbs_vp9_syntax_template.c"
408 #undef byte_alignment
411 static int cbs_vp9_split_fragment(CodedBitstreamContext *ctx,
412 CodedBitstreamFragment *frag,
415 uint8_t superframe_header;
418 if (frag->data_size == 0)
419 return AVERROR_INVALIDDATA;
421 // Last byte in the packet.
422 superframe_header = frag->data[frag->data_size - 1];
424 if ((superframe_header & 0xe0) == 0xc0) {
425 VP9RawSuperframeIndex sfi;
427 size_t index_size, pos;
430 index_size = 2 + (((superframe_header & 0x18) >> 3) + 1) *
431 ((superframe_header & 0x07) + 1);
433 if (index_size > frag->data_size)
434 return AVERROR_INVALIDDATA;
436 err = init_get_bits(&gbc, frag->data + frag->data_size - index_size,
441 err = cbs_vp9_read_superframe_index(ctx, &gbc, &sfi);
446 for (i = 0; i <= sfi.frames_in_superframe_minus_1; i++) {
447 if (pos + sfi.frame_sizes[i] + index_size > frag->data_size) {
448 av_log(ctx->log_ctx, AV_LOG_ERROR, "Frame %d too large "
449 "in superframe: %"PRIu32" bytes.\n",
450 i, sfi.frame_sizes[i]);
451 return AVERROR_INVALIDDATA;
454 err = ff_cbs_insert_unit_data(frag, -1, 0,
461 pos += sfi.frame_sizes[i];
463 if (pos + index_size != frag->data_size) {
464 av_log(ctx->log_ctx, AV_LOG_WARNING, "Extra padding at "
465 "end of superframe: %"SIZE_SPECIFIER" bytes.\n",
466 frag->data_size - (pos + index_size));
472 err = ff_cbs_insert_unit_data(frag, -1, 0,
473 frag->data, frag->data_size,
482 static int cbs_vp9_read_unit(CodedBitstreamContext *ctx,
483 CodedBitstreamUnit *unit)
489 err = init_get_bits(&gbc, unit->data, 8 * unit->data_size);
493 err = ff_cbs_alloc_unit_content2(ctx, unit);
496 frame = unit->content;
498 err = cbs_vp9_read_frame(ctx, &gbc, frame);
502 pos = get_bits_count(&gbc);
503 av_assert0(pos % 8 == 0);
505 av_assert0(pos <= unit->data_size);
507 if (pos == unit->data_size) {
508 // No data (e.g. a show-existing-frame frame).
510 frame->data_ref = av_buffer_ref(unit->data_ref);
511 if (!frame->data_ref)
512 return AVERROR(ENOMEM);
514 frame->data = unit->data + pos;
515 frame->data_size = unit->data_size - pos;
521 static int cbs_vp9_write_unit(CodedBitstreamContext *ctx,
522 CodedBitstreamUnit *unit,
525 VP9RawFrame *frame = unit->content;
528 err = cbs_vp9_write_frame(ctx, pbc, frame);
532 // Frame must be byte-aligned.
533 av_assert0(put_bits_count(pbc) % 8 == 0);
536 if (frame->data_size > put_bits_left(pbc) / 8)
537 return AVERROR(ENOSPC);
540 memcpy(put_bits_ptr(pbc), frame->data, frame->data_size);
541 skip_put_bytes(pbc, frame->data_size);
547 static int cbs_vp9_assemble_fragment(CodedBitstreamContext *ctx,
548 CodedBitstreamFragment *frag)
552 if (frag->nb_units == 1) {
553 // Output is just the content of the single frame.
555 CodedBitstreamUnit *frame = &frag->units[0];
557 frag->data_ref = av_buffer_ref(frame->data_ref);
559 return AVERROR(ENOMEM);
561 frag->data = frame->data;
562 frag->data_size = frame->data_size;
565 // Build superframe out of frames.
567 VP9RawSuperframeIndex sfi;
571 size_t size, max, pos;
574 if (frag->nb_units > 8) {
575 av_log(ctx->log_ctx, AV_LOG_ERROR, "Too many frames to "
576 "make superframe: %d.\n", frag->nb_units);
577 return AVERROR(EINVAL);
581 for (i = 0; i < frag->nb_units; i++)
582 if (max < frag->units[i].data_size)
583 max = frag->units[i].data_size;
588 size_len = av_log2(max) / 8 + 1;
589 av_assert0(size_len <= 4);
591 sfi.superframe_marker = VP9_SUPERFRAME_MARKER;
592 sfi.bytes_per_framesize_minus_1 = size_len - 1;
593 sfi.frames_in_superframe_minus_1 = frag->nb_units - 1;
596 for (i = 0; i < frag->nb_units; i++) {
597 size += size_len + frag->units[i].data_size;
598 sfi.frame_sizes[i] = frag->units[i].data_size;
601 ref = av_buffer_alloc(size + AV_INPUT_BUFFER_PADDING_SIZE);
603 return AVERROR(ENOMEM);
605 memset(data + size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
608 for (i = 0; i < frag->nb_units; i++) {
609 av_assert0(size - pos > frag->units[i].data_size);
610 memcpy(data + pos, frag->units[i].data,
611 frag->units[i].data_size);
612 pos += frag->units[i].data_size;
614 av_assert0(size - pos == 2 + frag->nb_units * size_len);
616 init_put_bits(&pbc, data + pos, size - pos);
618 err = cbs_vp9_write_superframe_index(ctx, &pbc, &sfi);
620 av_log(ctx->log_ctx, AV_LOG_ERROR, "Failed to write "
621 "superframe index.\n");
622 av_buffer_unref(&ref);
626 av_assert0(put_bits_left(&pbc) == 0);
627 flush_put_bits(&pbc);
629 frag->data_ref = ref;
631 frag->data_size = size;
637 static void cbs_vp9_flush(CodedBitstreamContext *ctx)
639 CodedBitstreamVP9Context *vp9 = ctx->priv_data;
641 memset(vp9->ref, 0, sizeof(vp9->ref));
644 static const CodedBitstreamUnitTypeDescriptor cbs_vp9_unit_types[] = {
645 CBS_UNIT_TYPE_INTERNAL_REF(0, VP9RawFrame, data),
646 CBS_UNIT_TYPE_END_OF_LIST
649 const CodedBitstreamType ff_cbs_type_vp9 = {
650 .codec_id = AV_CODEC_ID_VP9,
652 .priv_data_size = sizeof(CodedBitstreamVP9Context),
654 .unit_types = cbs_vp9_unit_types,
656 .split_fragment = &cbs_vp9_split_fragment,
657 .read_unit = &cbs_vp9_read_unit,
658 .write_unit = &cbs_vp9_write_unit,
660 .flush = &cbs_vp9_flush,
662 .assemble_fragment = &cbs_vp9_assemble_fragment,