95 lines
2.8 KiB
C++
95 lines
2.8 KiB
C++
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef MEDIA_CODECS_ES_DESCRIPTOR_H_
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#define MEDIA_CODECS_ES_DESCRIPTOR_H_
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#include <stddef.h>
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#include <stdint.h>
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#include <vector>
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namespace shaka {
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namespace media {
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class BitReader;
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class BufferWriter;
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// The following values are extracted from ISO 14496 Part 1 Table 5 -
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// objectTypeIndication Values. Only values currently in use are included.
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enum ObjectType {
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kForbidden = 0,
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kISO_14496_3 = 0x40, // MPEG4 AAC
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kISO_13818_7_AAC_LC = 0x67, // MPEG2 AAC-LC
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kDTSC = 0xA9, // DTS Coherent Acoustics audio
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kDTSE = 0xAC, // DTS Express low bit rate audio
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kDTSH = 0xAA, // DTS-HD High Resolution Audio
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kDTSL = 0xAB, // DTS-HD Master Audio
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};
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/// This class parses object type and decoder specific information from an
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/// elementary stream descriptor, which is usually contained in an esds
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/// box. Please refer to ISO 14496 Part 1 7.2.6.5 for more details.
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class ESDescriptor {
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public:
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ESDescriptor();
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~ESDescriptor();
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bool Parse(const std::vector<uint8_t>& data);
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void Write(BufferWriter* writer) const;
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size_t ComputeSize() const;
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uint16_t esid() const { return esid_; }
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void set_esid(uint16_t esid) { esid_ = esid; }
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uint32_t max_bitrate() const {return max_bitrate_; }
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void set_max_bitrate(uint32_t max_bitrate) { max_bitrate_ = max_bitrate; }
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uint32_t avg_bitrate() const { return avg_bitrate_; }
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void set_avg_bitrate(uint32_t avg_bitrate) { avg_bitrate_ = avg_bitrate; }
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ObjectType object_type() const { return object_type_; }
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void set_object_type(ObjectType object_type) { object_type_ = object_type; }
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const std::vector<uint8_t>& decoder_specific_info() const {
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return decoder_specific_info_;
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}
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void set_decoder_specific_info(
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const std::vector<uint8_t>& decoder_specific_info) {
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decoder_specific_info_ = decoder_specific_info;
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}
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/// @return true if the stream is AAC.
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bool IsAAC() const {
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return object_type_ == kISO_14496_3 || object_type_ == kISO_13818_7_AAC_LC;
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}
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bool IsDTS() const {
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return object_type_ == kDTSC || object_type_ == kDTSE ||
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object_type_ == kDTSH || object_type_ == kDTSL;
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}
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private:
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enum Tag {
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kESDescrTag = 0x03,
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kDecoderConfigDescrTag = 0x04,
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kDecoderSpecificInfoTag = 0x05,
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kSLConfigTag = 0x06,
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};
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bool ParseDecoderConfigDescriptor(BitReader* reader);
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bool ParseDecoderSpecificInfo(BitReader* reader);
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uint16_t esid_; // Elementary Stream ID.
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ObjectType object_type_;
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uint32_t max_bitrate_;
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uint32_t avg_bitrate_;
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std::vector<uint8_t> decoder_specific_info_;
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};
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} // namespace media
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} // namespace shaka
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#endif // MEDIA_CODECS_ES_DESCRIPTOR_H_
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