109 lines
3.4 KiB
C++
109 lines
3.4 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_TRACK_RUN_ITERATOR_H_
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#define MEDIA_MP4_TRACK_RUN_ITERATOR_H_
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#include <vector>
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#include "base/memory/scoped_ptr.h"
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#include "media/mp4/box_definitions.h"
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#include "media/mp4/cenc.h"
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namespace media {
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class DecryptConfig;
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namespace mp4 {
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struct SampleInfo;
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struct TrackRunInfo;
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class TrackRunIterator {
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public:
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// Create a new TrackRunIterator. A reference to |moov| will be retained for
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// the lifetime of this object.
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explicit TrackRunIterator(const Movie* moov);
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~TrackRunIterator();
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// For non-fragmented mp4, moov contains all the chunks information; This
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// function sets up the iterator to handle all the chunks.
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// For fragmented mp4, chunk and sample information are generally contained
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// in moof. This function is a no-op in this case. Init(moof) will be called
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// later after parsing moof.
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bool Init();
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// Sets up the iterator to handle all the runs from the current fragment.
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bool Init(const MovieFragment& moof);
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// Returns true if the properties of the current run or sample are valid.
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bool IsRunValid() const;
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bool IsSampleValid() const;
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// Advance the properties to refer to the next run or sample. Requires that
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// the current sample be valid.
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void AdvanceRun();
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void AdvanceSample();
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// Returns true if this track run has auxiliary information and has not yet
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// been cached. Only valid if IsRunValid().
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bool AuxInfoNeedsToBeCached();
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// Caches the CENC data from the given buffer. |buf| must be a buffer starting
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// at the offset given by cenc_offset(), with a |size| of at least
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// cenc_size(). Returns true on success, false on error.
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bool CacheAuxInfo(const uint8* buf, int size);
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// Returns the maximum buffer location at which no data earlier in the stream
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// will be required in order to read the current or any subsequent sample. You
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// may clear all data up to this offset before reading the current sample
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// safely. Result is in the same units as offset() (for Media Source this is
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// in bytes past the the head of the MOOF box).
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int64 GetMaxClearOffset();
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// Property of the current run. Only valid if IsRunValid().
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uint32 track_id() const;
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int64 aux_info_offset() const;
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int aux_info_size() const;
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bool is_encrypted() const;
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bool is_audio() const;
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// Only one is valid, based on the value of is_audio().
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const AudioSampleEntry& audio_description() const;
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const VideoSampleEntry& video_description() const;
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// Properties of the current sample. Only valid if IsSampleValid().
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int64 sample_offset() const;
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int sample_size() const;
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int64 dts() const;
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int64 cts() const;
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int64 duration() const;
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bool is_keyframe() const;
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// Only call when is_encrypted() is true and AuxInfoNeedsToBeCached() is
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// false. Result is owned by caller.
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scoped_ptr<DecryptConfig> GetDecryptConfig();
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private:
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void ResetRun();
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const TrackEncryption& track_encryption() const;
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const Movie* moov_;
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std::vector<TrackRunInfo> runs_;
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std::vector<TrackRunInfo>::const_iterator run_itr_;
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std::vector<SampleInfo>::const_iterator sample_itr_;
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std::vector<FrameCENCInfo> cenc_info_;
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int64 sample_dts_;
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int64 sample_offset_;
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DISALLOW_COPY_AND_ASSIGN(TrackRunIterator);
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};
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} // namespace mp4
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} // namespace media
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#endif // MEDIA_MP4_TRACK_RUN_ITERATOR_H_
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