85 lines
2.8 KiB
C++
85 lines
2.8 KiB
C++
// Copyright 2018 Google LLC. All rights reserved.
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//
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file or at
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// https://developers.google.com/open-source/licenses/bsd
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#include "packager/media/codecs/hls_audio_util.h"
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#include "packager/media/base/buffer_writer.h"
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#include "packager/media/base/fourccs.h"
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#include "packager/media/codecs/aac_audio_specific_config.h"
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namespace shaka {
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namespace media {
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bool WriteAudioSetupInformation(Codec codec,
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const uint8_t* audio_specific_config,
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size_t audio_specific_config_size,
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BufferWriter* audio_setup_information) {
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uint32_t audio_type = FOURCC_NULL;
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switch (codec) {
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case kCodecAAC: {
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AACAudioSpecificConfig config;
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const bool result = config.Parse(std::vector<uint8_t>(
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audio_specific_config,
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audio_specific_config + audio_specific_config_size));
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AACAudioSpecificConfig::AudioObjectType audio_object_type;
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if (!result) {
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LOG(WARNING) << "Failed to parse config. Assuming AAC-LC.";
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audio_object_type = AACAudioSpecificConfig::AOT_AAC_LC;
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} else {
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audio_object_type = config.GetAudioObjectType();
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}
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switch (audio_object_type) {
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case AACAudioSpecificConfig::AOT_AAC_LC:
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audio_type = FOURCC_zaac;
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break;
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case AACAudioSpecificConfig::AOT_SBR:
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audio_type = FOURCC_zach;
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break;
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case AACAudioSpecificConfig::AOT_PS:
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audio_type = FOURCC_zacp;
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break;
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default:
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LOG(ERROR) << "Unknown object type for aac " << audio_object_type;
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return false;
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}
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} break;
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case kCodecAC3:
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audio_type = FOURCC_zac3;
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break;
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case kCodecEAC3:
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audio_type = FOURCC_zec3;
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break;
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default:
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LOG(ERROR) << "Codec " << codec << " is not supported in encrypted TS.";
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return false;
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}
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DCHECK_NE(audio_type, FOURCC_NULL);
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audio_setup_information->AppendInt(audio_type);
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// Priming. Since no info from encoder, set it to 0x0000.
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audio_setup_information->AppendInt(static_cast<uint16_t>(0x0000));
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// Version is always 0x01.
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audio_setup_information->AppendInt(static_cast<uint8_t>(0x01));
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// Size is one byte.
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if (audio_specific_config_size > 0xFF) {
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LOG(ERROR) << "Audio specific config should not be larger than one byte "
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<< audio_specific_config_size;
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return false;
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}
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audio_setup_information->AppendInt(
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static_cast<uint8_t>(audio_specific_config_size));
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audio_setup_information->AppendArray(audio_specific_config,
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audio_specific_config_size);
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return true;
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}
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} // namespace media
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} // namespace shaka
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