125 lines
3.8 KiB
C++
125 lines
3.8 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_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 from movie box.
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/// @param moov should not be NULL.
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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 chunk information; This
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/// function sets up the iterator to access 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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/// @return true on success, false otherwise.
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bool Init();
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/// Set up the iterator to handle all the runs from the current fragment.
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/// @return true on success, false otherwise.
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bool Init(const MovieFragment& moof);
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/// @return true if the iterator points to a valid run, false if past the
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/// last run.
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bool IsRunValid() const;
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/// @return true if the iterator points to a valid sample, false if past the
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/// last sample.
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bool IsSampleValid() const;
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/// Advance iterator to the next run. Require that the iterator point to a
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/// valid run.
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void AdvanceRun();
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/// Advance iterator to the next sample. Require that the iterator point to a
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/// valid sample.
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void AdvanceSample();
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/// @return 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.
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/// @param buf must be a buffer starting at the offset given by cenc_offset().
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/// @param size must be at least cenc_size().
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/// @return true on success, false on error.
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bool CacheAuxInfo(const uint8* buf, int size);
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/// @return the maximum buffer location at which no data earlier in the
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/// stream will be required in order to read the current or any
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/// subsequent sample. You may clear all data up to this offset
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/// before reading the current sample safely. Result is in the same
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/// units as offset() (for Media Source this is in bytes past the
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/// head of the MOOF box).
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int64 GetMaxClearOffset();
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/// @name Properties of the current run. Only valid if IsRunValid().
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/// @{
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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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/// @}
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/// @name Only one is valid, based on the value of is_audio().
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/// @{
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const AudioSampleEntry& audio_description() const;
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const VideoSampleEntry& video_description() const;
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/// @}
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/// @name Properties of the current sample. Only valid if IsSampleValid().
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/// @{
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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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/// @}
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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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