81 lines
2.4 KiB
C++
81 lines
2.4 KiB
C++
// Copyright 2014 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_FORMATS_WEBM_WEBM_MEDIA_PARSER_H_
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#define MEDIA_FORMATS_WEBM_WEBM_MEDIA_PARSER_H_
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#include "packager/base/callback_forward.h"
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#include "packager/base/memory/ref_counted.h"
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#include "packager/media/base/byte_queue.h"
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#include "packager/media/base/media_parser.h"
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namespace edash_packager {
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namespace media {
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class WebMClusterParser;
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class WebMMediaParser : public MediaParser {
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public:
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WebMMediaParser();
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~WebMMediaParser() override;
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/// StreamParser implementation.
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void Init(const InitCB& init_cb,
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const NewSampleCB& new_sample_cb,
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KeySource* decryption_key_source) override;
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void Flush() override;
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bool Parse(const uint8_t* buf, int size) override;
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private:
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enum State {
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kWaitingForInit,
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kParsingHeaders,
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kParsingClusters,
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kError
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};
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void ChangeState(State new_state);
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// Parses WebM Header, Info, Tracks elements. It also skips other level 1
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// elements that are not used right now. Once the Info & Tracks elements have
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// been parsed, this method will transition the parser from PARSING_HEADERS to
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// PARSING_CLUSTERS.
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//
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// Returns < 0 if the parse fails.
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// Returns 0 if more data is needed.
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// Returning > 0 indicates success & the number of bytes parsed.
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int ParseInfoAndTracks(const uint8_t* data, int size);
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// Incrementally parses WebM cluster elements. This method also skips
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// CUES elements if they are encountered since we currently don't use the
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// data in these elements.
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//
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// Returns < 0 if the parse fails.
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// Returns 0 if more data is needed.
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// Returning > 0 indicates success & the number of bytes parsed.
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int ParseCluster(const uint8_t* data, int size);
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// Fetch keys for the input key ids. Returns true on success, false otherwise.
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bool FetchKeysIfNecessary(const std::string& audio_encryption_key_id,
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const std::string& video_encryption_key_id);
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State state_;
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InitCB init_cb_;
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NewSampleCB new_sample_cb_;
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KeySource* decryption_key_source_;
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bool ignore_text_tracks_;
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bool unknown_segment_size_;
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scoped_ptr<WebMClusterParser> cluster_parser_;
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ByteQueue byte_queue_;
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DISALLOW_COPY_AND_ASSIGN(WebMMediaParser);
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};
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} // namespace media
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} // namespace edash_packager
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#endif // MEDIA_FORMATS_WEBM_WEBM_MEDIA_PARSER_H_
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