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Add DTS Enumerations and Definitions for DTS Audio Support
This CL adds DTS Enumerations and Definitions for supporting playback of media streams that has DTS audio. Bug: 1270685 Change-Id: I5ca12650e99adb2c1c659ac7446190349a5350f8 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3271232 Commit-Queue: Mark Foltz <mfoltz@chromium.org> Reviewed-by: Dale Curtis <dalecurtis@chromium.org> Reviewed-by: Yuchen Liu <yucliu@chromium.org> Cr-Commit-Position: refs/heads/main@{#948239}
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,95 @@ | ||
| // Copyright 2021 The Chromium Authors. All rights reserved. | ||
| // Use of this source code is governed by a BSD-style license that can be | ||
| // found in the LICENSE file. | ||
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| #include "media/formats/dts/dts_stream_parser.h" | ||
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| #include <stddef.h> | ||
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| #include "build/build_config.h" | ||
| #include "media/base/media_log.h" | ||
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| namespace media { | ||
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| DTSStreamParser::DTSStreamParser() | ||
| : MPEGAudioStreamParserBase(kDTSCoreSyncWord, AudioCodec::kDTS, 0) {} | ||
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| DTSStreamParser::~DTSStreamParser() = default; | ||
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| int DTSStreamParser::ParseFrameHeader(const uint8_t* data, | ||
| int size, | ||
| int* frame_size, | ||
| int* sample_rate, | ||
| ChannelLayout* channel_layout, | ||
| int* sample_count, | ||
| bool* metadata_frame, | ||
| std::vector<uint8_t>* extra_data) { | ||
| if (data == nullptr || size < kDTSCoreHeaderSizeInBytes) | ||
| return 0; | ||
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| BitReader reader(data, size); | ||
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| // Read and validate Sync word. | ||
| uint32_t sync_word = 0; | ||
| reader.ReadBits(32, &sync_word); | ||
| if (sync_word != kDTSCoreSyncWord) | ||
| return 0; | ||
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| int fsize = 0, ext_audio = 0, ext_audio_id = 0, nblks = 0, sfreq = 0; | ||
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| // Skip ftype(1-bit) + DeficitSample Count(5-bits) + CRC Present Flag(1-bit) | ||
| reader.SkipBits(7); | ||
| reader.ReadBits(7, &nblks); | ||
| reader.ReadBits(14, &fsize); | ||
| reader.SkipBits(6); // Skip AMODE | ||
| reader.ReadBits(4, &sfreq); | ||
| reader.SkipBits(10); // Skip: RATE, FixedBit, DNYF, TIMEF, AUSX, HDCD | ||
| reader.ReadBits(3, &ext_audio_id); | ||
| reader.ReadBits(1, &ext_audio); | ||
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| constexpr int kSampleRateCore[16] = {0, 8000, 16000, 32000, 0, 0, | ||
| 11025, 22050, 44100, 0, 0, 12000, | ||
| 24000, 48000, 0, 0}; | ||
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| if (fsize < 95) // Invalid values of FSIZE is 0-94. | ||
| return 0; | ||
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| if (nblks < 5 || nblks > 127) // Valid values of nblks is 5-127. | ||
| return 0; | ||
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| if (kSampleRateCore[sfreq] == 0) // Table value of 0 indicates invalid | ||
| return 0; | ||
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| // extended audio may modify sample count and rate | ||
| bool is_core_x96 = ext_audio && ext_audio_id == 2; | ||
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| if (channel_layout) | ||
| *channel_layout = media::CHANNEL_LAYOUT_5_1; | ||
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| if (extra_data) | ||
| extra_data->clear(); | ||
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| if (frame_size) | ||
| *frame_size = fsize + 1; // Framesize is FSIZE + 1. | ||
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| if (metadata_frame) | ||
| *metadata_frame = false; | ||
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| // Use nblks to compute frame duration, a.k.a number of PCM samples per | ||
| // channel in the current DTS frames in the buffer. | ||
| if (sample_count) { | ||
| *sample_count = (nblks + 1) * 32; // Num of PCM samples in current frame | ||
| if (is_core_x96) | ||
| *sample_count <<= 1; | ||
| } | ||
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| if (sample_rate) { | ||
| *sample_rate = kSampleRateCore[sfreq]; // sfreq is table lookup | ||
| if (is_core_x96) | ||
| *sample_rate <<= 1; | ||
| } | ||
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| return reader.bits_read() / 8; | ||
| } | ||
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| } // namespace media |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,39 @@ | ||
| // Copyright 2021 The Chromium Authors. All rights reserved. | ||
| // Use of this source code is governed by a BSD-style license that can be | ||
| // found in the LICENSE file. | ||
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| #ifndef MEDIA_FORMATS_DTS_DTS_STREAM_PARSER_H_ | ||
| #define MEDIA_FORMATS_DTS_DTS_STREAM_PARSER_H_ | ||
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| #include <stdint.h> | ||
| #include <vector> | ||
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| #include "media/base/media_export.h" | ||
| #include "media/formats/mpeg/mpeg_audio_stream_parser_base.h" | ||
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| namespace media { | ||
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| class MEDIA_EXPORT DTSStreamParser : public MPEGAudioStreamParserBase { | ||
| public: | ||
| DTSStreamParser(); | ||
| ~DTSStreamParser() override; | ||
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| enum { | ||
| kDTSCoreHeaderSizeInBytes = 15, | ||
| kDTSCoreSyncWord = 0x7ffe8001, | ||
| }; | ||
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| // MPEGAudioStreamParserBase overrides. | ||
| int ParseFrameHeader(const uint8_t* data, | ||
| int size, | ||
| int* frame_size, | ||
| int* sample_rate, | ||
| ChannelLayout* channel_layout, | ||
| int* sample_count, | ||
| bool* metadata_frame, | ||
| std::vector<uint8_t>* extra_data) override; | ||
| }; | ||
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| } // namespace media | ||
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| #endif // MEDIA_FORMATS_DTS_DTS_STREAM_PARSER_H_ |
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