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[chromium-blink-merge.git] / media / mp2t / es_parser_h264.cc
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1 // Copyright 2013 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #include "media/mp2t/es_parser_h264.h"
7 #include "base/basictypes.h"
8 #include "base/logging.h"
9 #include "media/base/bit_reader.h"
10 #include "media/base/buffers.h"
11 #include "media/base/stream_parser_buffer.h"
12 #include "media/base/video_frame.h"
13 #include "media/mp2t/mp2t_common.h"
14 #include "ui/gfx/rect.h"
15 #include "ui/gfx/size.h"
17 static const int kExtendedSar = 255;
19 // ISO 14496 part 10
20 // VUI parameters: Table E-1 "Meaning of sample aspect ratio indicator"
21 static const int kSarTableSize = 17;
22 static const int kTableSarWidth[kSarTableSize] = {
23 0, 1, 12, 10, 16, 40, 24, 20, 32, 80, 18, 15, 64, 160, 4, 3, 2
25 static const int kTableSarHeight[kSarTableSize] = {
26 0, 1, 11, 11, 11, 33, 11, 11, 11, 33, 11, 11, 33, 99, 3, 2, 1
29 // Remove the start code emulation prevention ( 0x000003 )
30 // and return the size of the converted buffer.
31 // Note: Size of |buf_rbsp| should be at least |size| to accomodate
32 // the worst case.
33 static int ConvertToRbsp(const uint8* buf, int size, uint8* buf_rbsp) {
34 int rbsp_size = 0;
35 int zero_count = 0;
36 for (int k = 0; k < size; k++) {
37 if (buf[k] == 0x3 && zero_count >= 2) {
38 zero_count = 0;
39 continue;
41 if (buf[k] == 0)
42 zero_count++;
43 else
44 zero_count = 0;
45 buf_rbsp[rbsp_size++] = buf[k];
47 return rbsp_size;
50 namespace media {
51 namespace mp2t {
53 // ISO 14496 - Part 10: Table 7-1 "NAL unit type codes"
54 enum NalUnitType {
55 kNalUnitTypeNonIdrSlice = 1,
56 kNalUnitTypeIdrSlice = 5,
57 kNalUnitTypeSPS = 7,
58 kNalUnitTypePPS = 8,
59 kNalUnitTypeAUD = 9,
62 class BitReaderH264 : public BitReader {
63 public:
64 BitReaderH264(const uint8* data, off_t size)
65 : BitReader(data, size) { }
67 // Read an unsigned exp-golomb value.
68 // Return true if successful.
69 bool ReadBitsExpGolomb(uint32* exp_golomb_value);
72 bool BitReaderH264::ReadBitsExpGolomb(uint32* exp_golomb_value) {
73 // Get the number of leading zeros.
74 int zero_count = 0;
75 while (true) {
76 int one_bit;
77 RCHECK(ReadBits(1, &one_bit));
78 if (one_bit != 0)
79 break;
80 zero_count++;
83 // If zero_count is greater than 31, the calculated value will overflow.
84 if (zero_count > 31) {
85 SkipBits(zero_count);
86 return false;
89 // Read the actual value.
90 uint32 base = (1 << zero_count) - 1;
91 uint32 offset;
92 RCHECK(ReadBits(zero_count, &offset));
93 *exp_golomb_value = base + offset;
95 return true;
98 EsParserH264::EsParserH264(
99 const NewVideoConfigCB& new_video_config_cb,
100 const EmitBufferCB& emit_buffer_cb)
101 : new_video_config_cb_(new_video_config_cb),
102 emit_buffer_cb_(emit_buffer_cb),
103 es_pos_(0),
104 current_nal_pos_(-1),
105 current_access_unit_pos_(-1),
106 is_key_frame_(false) {
109 EsParserH264::~EsParserH264() {
112 bool EsParserH264::Parse(const uint8* buf, int size,
113 base::TimeDelta pts,
114 base::TimeDelta dts) {
115 // Note: Parse is invoked each time a PES packet has been reassembled.
116 // Unfortunately, a PES packet does not necessarily map
117 // to an h264 access unit, although the HLS recommendation is to use one PES
118 // for each access unit (but this is just a recommendation and some streams
119 // do not comply with this recommendation).
121 // Link position |raw_es_size| in the ES stream with a timing descriptor.
122 // HLS recommendation: "In AVC video, you should have both a DTS and a
123 // PTS in each PES header".
124 if (dts == kNoTimestamp() && pts == kNoTimestamp()) {
125 DVLOG(1) << "A timestamp must be provided for each reassembled PES";
126 return false;
128 TimingDesc timing_desc;
129 timing_desc.pts = pts;
130 timing_desc.dts = (dts != kNoTimestamp()) ? dts : pts;
132 int raw_es_size;
133 const uint8* raw_es;
134 es_byte_queue_.Peek(&raw_es, &raw_es_size);
135 timing_desc_list_.push_back(
136 std::pair<int, TimingDesc>(raw_es_size, timing_desc));
138 // Add the incoming bytes to the ES queue.
139 es_byte_queue_.Push(buf, size);
141 // Add NALs from the incoming buffer.
142 if (!ParseInternal())
143 return false;
145 // Discard emitted frames
146 // or every byte that was parsed so far if there is no current frame.
147 int skip_count =
148 (current_access_unit_pos_ >= 0) ? current_access_unit_pos_ : es_pos_;
149 DiscardEs(skip_count);
151 return true;
154 void EsParserH264::Flush() {
155 if (current_access_unit_pos_ < 0)
156 return;
158 // Force emitting the last access unit.
159 int next_aud_pos;
160 const uint8* raw_es;
161 es_byte_queue_.Peek(&raw_es, &next_aud_pos);
162 EmitFrameIfNeeded(next_aud_pos);
163 current_nal_pos_ = -1;
164 StartFrame(-1);
166 // Discard the emitted frame.
167 DiscardEs(next_aud_pos);
170 void EsParserH264::Reset() {
171 DVLOG(1) << "EsParserH264::Reset";
172 es_byte_queue_.Reset();
173 timing_desc_list_.clear();
174 es_pos_ = 0;
175 current_nal_pos_ = -1;
176 StartFrame(-1);
177 last_video_decoder_config_ = VideoDecoderConfig();
180 bool EsParserH264::ParseInternal() {
181 int raw_es_size;
182 const uint8* raw_es;
183 es_byte_queue_.Peek(&raw_es, &raw_es_size);
185 DCHECK_GE(es_pos_, 0);
186 DCHECK_LT(es_pos_, raw_es_size);
188 // Resume h264 es parsing where it was left.
189 for ( ; es_pos_ < raw_es_size - 4; es_pos_++) {
190 // Make sure the syncword is either 00 00 00 01 or 00 00 01
191 if (raw_es[es_pos_ + 0] != 0 || raw_es[es_pos_ + 1] != 0)
192 continue;
193 int syncword_length = 0;
194 if (raw_es[es_pos_ + 2] == 0 && raw_es[es_pos_ + 3] == 1)
195 syncword_length = 4;
196 else if (raw_es[es_pos_ + 2] == 1)
197 syncword_length = 3;
198 else
199 continue;
201 // Parse the current NAL (and the new NAL then becomes the current one).
202 if (current_nal_pos_ >= 0) {
203 int nal_size = es_pos_ - current_nal_pos_;
204 DCHECK_GT(nal_size, 0);
205 RCHECK(NalParser(&raw_es[current_nal_pos_], nal_size));
207 current_nal_pos_ = es_pos_ + syncword_length;
209 // Retrieve the NAL type.
210 int nal_header = raw_es[current_nal_pos_];
211 int forbidden_zero_bit = (nal_header >> 7) & 0x1;
212 RCHECK(forbidden_zero_bit == 0);
213 NalUnitType nal_unit_type = static_cast<NalUnitType>(nal_header & 0x1f);
214 DVLOG(LOG_LEVEL_ES) << "nal: offset=" << es_pos_
215 << " type=" << nal_unit_type;
217 // Emit a frame if needed.
218 if (nal_unit_type == kNalUnitTypeAUD)
219 RCHECK(EmitFrameIfNeeded(es_pos_));
221 // Skip the syncword.
222 es_pos_ += syncword_length;
225 return true;
228 bool EsParserH264::EmitFrameIfNeeded(int next_aud_pos) {
229 // There is no current frame: start a new frame.
230 if (current_access_unit_pos_ < 0) {
231 StartFrame(next_aud_pos);
232 return true;
235 // Get the access unit timing info.
236 TimingDesc current_timing_desc = {kNoTimestamp(), kNoTimestamp()};
237 while (!timing_desc_list_.empty() &&
238 timing_desc_list_.front().first <= current_access_unit_pos_) {
239 current_timing_desc = timing_desc_list_.front().second;
240 timing_desc_list_.pop_front();
243 if (current_timing_desc.pts == kNoTimestamp())
244 return false;
246 // Emit a frame.
247 int raw_es_size;
248 const uint8* raw_es;
249 es_byte_queue_.Peek(&raw_es, &raw_es_size);
250 int access_unit_size = next_aud_pos - current_access_unit_pos_;
251 scoped_refptr<StreamParserBuffer> stream_parser_buffer =
252 StreamParserBuffer::CopyFrom(
253 &raw_es[current_access_unit_pos_],
254 access_unit_size,
255 is_key_frame_);
256 stream_parser_buffer->SetDecodeTimestamp(current_timing_desc.dts);
257 stream_parser_buffer->set_timestamp(current_timing_desc.pts);
258 emit_buffer_cb_.Run(stream_parser_buffer);
260 // Set the current frame position to the next AUD position.
261 StartFrame(next_aud_pos);
262 return true;
265 void EsParserH264::StartFrame(int aud_pos) {
266 // Two cases:
267 // - if aud_pos < 0, clear the current frame and set |is_key_frame| to a
268 // default value (false).
269 // - if aud_pos >= 0, start a new frame and set |is_key_frame| to true
270 // |is_key_frame_| will be updated while parsing the NALs of that frame.
271 // If any NAL is a non IDR NAL, it will be set to false.
272 current_access_unit_pos_ = aud_pos;
273 is_key_frame_ = (aud_pos >= 0);
276 void EsParserH264::DiscardEs(int nbytes) {
277 DCHECK_GE(nbytes, 0);
278 if (nbytes == 0)
279 return;
281 // Update the position of
282 // - the parser,
283 // - the current NAL,
284 // - the current access unit.
285 es_pos_ -= nbytes;
286 if (es_pos_ < 0)
287 es_pos_ = 0;
289 if (current_nal_pos_ >= 0) {
290 DCHECK_GE(current_nal_pos_, nbytes);
291 current_nal_pos_ -= nbytes;
293 if (current_access_unit_pos_ >= 0) {
294 DCHECK_GE(current_access_unit_pos_, nbytes);
295 current_access_unit_pos_ -= nbytes;
298 // Update the timing information accordingly.
299 std::list<std::pair<int, TimingDesc> >::iterator timing_it
300 = timing_desc_list_.begin();
301 for (; timing_it != timing_desc_list_.end(); ++timing_it)
302 timing_it->first -= nbytes;
304 // Discard |nbytes| of ES.
305 es_byte_queue_.Pop(nbytes);
308 bool EsParserH264::NalParser(const uint8* buf, int size) {
309 // Get the NAL header.
310 if (size < 1) {
311 DVLOG(1) << "NalParser: incomplete NAL";
312 return false;
314 int nal_header = buf[0];
315 buf += 1;
316 size -= 1;
318 int forbidden_zero_bit = (nal_header >> 7) & 0x1;
319 if (forbidden_zero_bit != 0)
320 return false;
321 int nal_ref_idc = (nal_header >> 5) & 0x3;
322 int nal_unit_type = nal_header & 0x1f;
324 // Process the NAL content.
325 switch (nal_unit_type) {
326 case kNalUnitTypeSPS:
327 DVLOG(LOG_LEVEL_ES) << "NAL: SPS";
328 // |nal_ref_idc| should not be 0 for a SPS.
329 if (nal_ref_idc == 0)
330 return false;
331 return ProcessSPS(buf, size);
332 case kNalUnitTypeIdrSlice:
333 DVLOG(LOG_LEVEL_ES) << "NAL: IDR slice";
334 return true;
335 case kNalUnitTypeNonIdrSlice:
336 DVLOG(LOG_LEVEL_ES) << "NAL: Non IDR slice";
337 is_key_frame_ = false;
338 return true;
339 case kNalUnitTypePPS:
340 DVLOG(LOG_LEVEL_ES) << "NAL: PPS";
341 return true;
342 case kNalUnitTypeAUD:
343 DVLOG(LOG_LEVEL_ES) << "NAL: AUD";
344 return true;
345 default:
346 DVLOG(LOG_LEVEL_ES) << "NAL: " << nal_unit_type;
347 return true;
350 NOTREACHED();
351 return false;
354 bool EsParserH264::ProcessSPS(const uint8* buf, int size) {
355 if (size <= 0)
356 return false;
358 // Removes start code emulation prevention.
359 // TODO(damienv): refactoring in media/base
360 // so as to have a unique H264 bit reader in Chrome.
361 scoped_ptr<uint8[]> buf_rbsp(new uint8[size]);
362 int rbsp_size = ConvertToRbsp(buf, size, buf_rbsp.get());
364 BitReaderH264 bit_reader(buf_rbsp.get(), rbsp_size);
366 int profile_idc;
367 int constraint_setX_flag;
368 int level_idc;
369 uint32 seq_parameter_set_id;
370 uint32 log2_max_frame_num_minus4;
371 uint32 pic_order_cnt_type;
372 RCHECK(bit_reader.ReadBits(8, &profile_idc));
373 RCHECK(bit_reader.ReadBits(8, &constraint_setX_flag));
374 RCHECK(bit_reader.ReadBits(8, &level_idc));
375 RCHECK(bit_reader.ReadBitsExpGolomb(&seq_parameter_set_id));
377 if (profile_idc == 100 || profile_idc == 110 ||
378 profile_idc == 122 || profile_idc == 244 ||
379 profile_idc == 44 || profile_idc == 83 ||
380 profile_idc == 86 || profile_idc == 118 ||
381 profile_idc == 128) {
382 uint32 chroma_format_idc;
383 RCHECK(bit_reader.ReadBitsExpGolomb(&chroma_format_idc));
384 if (chroma_format_idc == 3) {
385 int separate_colour_plane_flag;
386 RCHECK(bit_reader.ReadBits(1, &separate_colour_plane_flag));
388 uint32 bit_depth_luma_minus8;
389 uint32 bit_depth_chroma_minus8;
390 int qpprime_y_zero_transform_bypass_flag;
391 int seq_scaling_matrix_present_flag;
392 RCHECK(bit_reader.ReadBitsExpGolomb(&bit_depth_luma_minus8));
393 RCHECK(bit_reader.ReadBitsExpGolomb(&bit_depth_chroma_minus8));
394 RCHECK(bit_reader.ReadBits(1, &qpprime_y_zero_transform_bypass_flag));
395 RCHECK(bit_reader.ReadBits(1, &seq_scaling_matrix_present_flag));
396 if (seq_scaling_matrix_present_flag) {
397 int skip_count = (chroma_format_idc != 3) ? 8 : 12;
398 RCHECK(bit_reader.SkipBits(skip_count));
402 RCHECK(bit_reader.ReadBitsExpGolomb(&log2_max_frame_num_minus4));
403 RCHECK(bit_reader.ReadBitsExpGolomb(&pic_order_cnt_type));
405 // |pic_order_cnt_type| shall be in the range of 0 to 2.
406 RCHECK(pic_order_cnt_type <= 2);
407 if (pic_order_cnt_type == 0) {
408 uint32 log2_max_pic_order_cnt_lsb_minus4;
409 RCHECK(bit_reader.ReadBitsExpGolomb(&log2_max_pic_order_cnt_lsb_minus4));
410 } else if (pic_order_cnt_type == 1) {
411 // Note: |offset_for_non_ref_pic| and |offset_for_top_to_bottom_field|
412 // corresponds to their codenum not to their actual value.
413 int delta_pic_order_always_zero_flag;
414 uint32 offset_for_non_ref_pic;
415 uint32 offset_for_top_to_bottom_field;
416 uint32 num_ref_frames_in_pic_order_cnt_cycle;
417 RCHECK(bit_reader.ReadBits(1, &delta_pic_order_always_zero_flag));
418 RCHECK(bit_reader.ReadBitsExpGolomb(&offset_for_non_ref_pic));
419 RCHECK(bit_reader.ReadBitsExpGolomb(&offset_for_top_to_bottom_field));
420 RCHECK(
421 bit_reader.ReadBitsExpGolomb(&num_ref_frames_in_pic_order_cnt_cycle));
422 for (uint32 i = 0; i < num_ref_frames_in_pic_order_cnt_cycle; i++) {
423 uint32 offset_for_ref_frame_codenum;
424 RCHECK(bit_reader.ReadBitsExpGolomb(&offset_for_ref_frame_codenum));
428 uint32 num_ref_frames;
429 int gaps_in_frame_num_value_allowed_flag;
430 uint32 pic_width_in_mbs_minus1;
431 uint32 pic_height_in_map_units_minus1;
432 RCHECK(bit_reader.ReadBitsExpGolomb(&num_ref_frames));
433 RCHECK(bit_reader.ReadBits(1, &gaps_in_frame_num_value_allowed_flag));
434 RCHECK(bit_reader.ReadBitsExpGolomb(&pic_width_in_mbs_minus1));
435 RCHECK(bit_reader.ReadBitsExpGolomb(&pic_height_in_map_units_minus1));
437 int frame_mbs_only_flag;
438 RCHECK(bit_reader.ReadBits(1, &frame_mbs_only_flag));
439 if (!frame_mbs_only_flag) {
440 int mb_adaptive_frame_field_flag;
441 RCHECK(bit_reader.ReadBits(1, &mb_adaptive_frame_field_flag));
444 int direct_8x8_inference_flag;
445 RCHECK(bit_reader.ReadBits(1, &direct_8x8_inference_flag));
447 int frame_cropping_flag;
448 uint32 frame_crop_left_offset = 0;
449 uint32 frame_crop_right_offset = 0;
450 uint32 frame_crop_top_offset = 0;
451 uint32 frame_crop_bottom_offset = 0;
452 RCHECK(bit_reader.ReadBits(1, &frame_cropping_flag));
453 if (frame_cropping_flag) {
454 RCHECK(bit_reader.ReadBitsExpGolomb(&frame_crop_left_offset));
455 RCHECK(bit_reader.ReadBitsExpGolomb(&frame_crop_right_offset));
456 RCHECK(bit_reader.ReadBitsExpGolomb(&frame_crop_top_offset));
457 RCHECK(bit_reader.ReadBitsExpGolomb(&frame_crop_bottom_offset));
460 int vui_parameters_present_flag;
461 RCHECK(bit_reader.ReadBits(1, &vui_parameters_present_flag));
462 int sar_width = 1;
463 int sar_height = 1;
464 if (vui_parameters_present_flag) {
465 // Read only the aspect ratio information from the VUI section.
466 // TODO(damienv): check whether other VUI info are useful.
467 int aspect_ratio_info_present_flag;
468 RCHECK(bit_reader.ReadBits(1, &aspect_ratio_info_present_flag));
469 if (aspect_ratio_info_present_flag) {
470 int aspect_ratio_idc;
471 RCHECK(bit_reader.ReadBits(8, &aspect_ratio_idc));
472 if (aspect_ratio_idc == kExtendedSar) {
473 RCHECK(bit_reader.ReadBits(16, &sar_width));
474 RCHECK(bit_reader.ReadBits(16, &sar_height));
475 } else if (aspect_ratio_idc < kSarTableSize) {
476 sar_width = kTableSarWidth[aspect_ratio_idc];
477 sar_height = kTableSarHeight[aspect_ratio_idc];
482 if (sar_width == 0 || sar_height == 0) {
483 DVLOG(1) << "Unspecified SAR not supported";
484 return false;
487 // TODO(damienv): a MAP unit can be either 16 or 32 pixels.
488 // although it's 16 pixels for progressive non MBAFF frames.
489 gfx::Size coded_size((pic_width_in_mbs_minus1 + 1) * 16,
490 (pic_height_in_map_units_minus1 + 1) * 16);
491 gfx::Rect visible_rect(
492 frame_crop_left_offset,
493 frame_crop_top_offset,
494 (coded_size.width() - frame_crop_right_offset) - frame_crop_left_offset,
495 (coded_size.height() - frame_crop_bottom_offset) - frame_crop_top_offset);
496 if (visible_rect.width() <= 0 || visible_rect.height() <= 0)
497 return false;
498 gfx::Size natural_size((visible_rect.width() * sar_width) / sar_height,
499 visible_rect.height());
500 if (natural_size.width() == 0)
501 return false;
503 // TODO(damienv):
504 // Assuming the SPS is used right away by the PPS
505 // and the slice headers is a strong assumption.
506 // In theory, we should process the SPS and PPS
507 // and only when one of the slice header is switching
508 // the PPS id, the video decoder config should be changed.
509 VideoDecoderConfig video_decoder_config(
510 kCodecH264,
511 VIDEO_CODEC_PROFILE_UNKNOWN, // TODO(damienv)
512 VideoFrame::YV12,
513 coded_size,
514 visible_rect,
515 natural_size,
516 NULL, 0,
517 false);
519 if (!video_decoder_config.Matches(last_video_decoder_config_)) {
520 DVLOG(1) << "Profile IDC: " << profile_idc;
521 DVLOG(1) << "Level IDC: " << level_idc;
522 DVLOG(1) << "Pic width: " << (pic_width_in_mbs_minus1 + 1) * 16;
523 DVLOG(1) << "Pic height: " << (pic_height_in_map_units_minus1 + 1) * 16;
524 DVLOG(1) << "log2_max_frame_num_minus4: " << log2_max_frame_num_minus4;
525 DVLOG(1) << "SAR: width=" << sar_width << " height=" << sar_height;
526 last_video_decoder_config_ = video_decoder_config;
527 new_video_config_cb_.Run(video_decoder_config);
530 return true;
533 } // namespace mp2t
534 } // namespace media