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       1             : /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
       2             : /* vim: set ts=8 sts=2 et sw=2 tw=80: */
       3             : /* This Source Code Form is subject to the terms of the Mozilla Public
       4             : * License, v. 2.0. If a copy of the MPL was not distributed with this
       5             : * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
       6             : 
       7             : #ifndef FLAC_FRAME_PARSER_H_
       8             : #define FLAC_FRAME_PARSER_H_
       9             : 
      10             : #include "mozilla/Maybe.h"
      11             : #include "nsAutoPtr.h"
      12             : #include "MediaDecoder.h" // For MetadataTags
      13             : #include "MediaInfo.h"
      14             : #include "MediaResource.h"
      15             : 
      16             : namespace mozilla
      17             : {
      18             : 
      19             : class OpusParser;
      20             : 
      21             : // Decode a Flac Metadata block contained in either a ogg packet
      22             : // (https://xiph.org/flac/ogg_mapping.html) or in flac container
      23             : // (https://xiph.org/flac/format.html#frame_header)
      24             : 
      25             : class FlacFrameParser
      26             : {
      27             : public:
      28             :   FlacFrameParser();
      29             :   ~FlacFrameParser();
      30             : 
      31             :   bool IsHeaderBlock(const uint8_t* aPacket, size_t aLength) const;
      32             :   // Return the length of the block header (METADATA_BLOCK_HEADER+
      33             :   // METADATA_BLOCK_DATA), aPacket must point to at least 4
      34             :   // bytes and to a valid block header start (as determined by IsHeaderBlock).
      35             :   uint32_t HeaderBlockLength(const uint8_t* aPacket) const;
      36             :   bool DecodeHeaderBlock(const uint8_t* aPacket, size_t aLength);
      37           0 :   bool HasFullMetadata() const { return mFullMetadata; }
      38             :   // Return the duration in frames found in the block. -1 if error
      39             :   // such as invalid packet.
      40             :   int64_t BlockDuration(const uint8_t* aPacket, size_t aLength) const;
      41             : 
      42             :   // Return a hash table with tag metadata.
      43             :   MetadataTags* GetTags() const;
      44             : 
      45             :   AudioInfo mInfo;
      46             : 
      47             : private:
      48             :   bool ReconstructFlacGranulepos(void);
      49             :   Maybe<uint32_t> mNumHeaders;
      50             :   uint32_t mMinBlockSize;
      51             :   uint32_t mMaxBlockSize;
      52             :   uint32_t mMinFrameSize;
      53             :   uint32_t mMaxFrameSize;
      54             :   uint64_t mNumFrames;
      55             :   bool mFullMetadata;
      56             :   uint32_t mPacketCount;
      57             : 
      58             :   // Used to decode the vorbis comment metadata.
      59             :   nsAutoPtr<OpusParser> mParser;
      60             : };
      61             : 
      62             : }
      63             : 
      64             : #endif // FLAC_FRAME_PARSER_H_