80 lines
2.1 KiB
C++
80 lines
2.1 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_MP4_ES_DESCRIPTOR_H_
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#define MEDIA_MP4_ES_DESCRIPTOR_H_
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#include <vector>
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#include "base/basictypes.h"
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namespace media {
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class BitReader;
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class BufferWriter;
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namespace mp4 {
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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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kEAC3 = 0xa6 // Dolby Digital Plus
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};
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// This class parse object type and decoder specific information from an
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// elementary stream descriptor, which is usually contained in an esds box.
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// 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>& data);
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void Write(BufferWriter* writer) const;
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size_t ComputeSize() const;
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uint16 esid() const { return esid_; }
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void set_esid(uint16 esid) { esid_ = esid; }
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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>& 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>& decoder_specific_info) {
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decoder_specific_info_ = decoder_specific_info;
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}
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// Check 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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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 esid_; // Elementary Stream ID.
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ObjectType object_type_;
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std::vector<uint8> decoder_specific_info_;
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};
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} // namespace mp4
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} // namespace media
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#endif // MEDIA_MP4_ES_DESCRIPTOR_H_
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