Remove the old MP3FrameParser

All former users of the old MP3 parsing code are gone, so we can now just remove the parser itself as well.

1 files changed, 0 insertions, 219 deletions

diff --git a/dom/media/MP3FrameParser.h b/dom/media/MP3FrameParser.h
deleted file mode 100644
index d2ba791fd..000000000
--- a/dom/media/MP3FrameParser.h
+++ /dev/null
@@ -1,219 +0,0 @@
-/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* vim:set ts=2 sw=2 sts=2 et cindent: */
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#ifndef MP3FrameParser_h
-#define MP3FrameParser_h
-
-#include <stdint.h>
-
-#include "mozilla/Mutex.h"
-#include "nsString.h"
-#include "Intervals.h"
-
-namespace mozilla {
-
-// Simple parser to tell whether we've found an ID3 header and how long it is,
-// so that we can skip it.
-// XXX maybe actually parse this stuff?
-class ID3Parser
-{
-public:
-  ID3Parser();
-
-  void Reset();
-  bool ParseChar(char ch);
-  bool IsParsed() const;
-  uint32_t GetHeaderLength() const;
-
-private:
-  uint32_t mCurrentChar;
-  uint8_t mVersion;
-  uint8_t mFlags;
-  uint32_t mHeaderLength;
-};
-
-struct MP3Frame {
-  uint16_t mSync1 : 8;      // Always all set
-  uint16_t mProtected : 1;  // Ignored
-  uint16_t mLayer : 2;
-  uint16_t mVersion : 2;
-  uint16_t mSync2 : 3;      // Always all set
-  uint16_t mPrivate : 1;    // Ignored
-  uint16_t mPad : 1;
-  uint16_t mSampleRate : 2; // Index into mpeg_srates above
-  uint16_t mBitrate : 4;    // Index into mpeg_bitrates above
-
-  uint16_t CalculateLength();
-};
-
-// Buffering parser for MP3 frames.
-class MP3Parser
-{
-public:
-  MP3Parser();
-
-  // Forget all data the parser has seen so far.
-  void Reset();
-
-  // Parse the given byte. If we have found a frame header, return the length of
-  // the frame.
-  uint16_t ParseFrameLength(uint8_t ch);
-
-  // Get the sample rate from the current header.
-  uint32_t GetSampleRate();
-
-  // Get the number of samples per frame.
-  uint32_t GetSamplesPerFrame();
-
-private:
-  uint32_t mCurrentChar;
-  union {
-    uint8_t mRaw[3];
-    MP3Frame mFrame;
-  } mData;
-};
-
-
-// A description of the MP3 format and its extensions is available at
-//
-//  http://www.codeproject.com/Articles/8295/MPEG-Audio-Frame-Header
-//
-// The data in MP3 streams is split into small frames, with each frame
-// containing a fixed number of samples. The duration of a frame depends
-// on the frame's bit rate and sample rate. Both values can vary among
-// frames, so it is necessary to examine each individual frame of an MP3
-// stream to calculate the stream's overall duration.
-//
-// The MP3 frame parser extracts information from an MP3 data stream. It
-// accepts a range of frames of an MP3 stream as input, and parses all
-// frames for their duration. Callers can query the stream's overall
-// duration from the parser.
-//
-// Call the methods NotifyDataArrived or Parse to add new data. If you added
-// information for a certain stream position, you cannot go back to previous
-// positions. The parser will simply ignore the input. If you skip stream
-// positions, the duration of the related MP3 frames will be estimated from
-// the stream's average.
-//
-// The method GetDuration returns calculated duration of the stream, including
-// estimates for skipped ranges.
-//
-// All public methods are thread-safe.
-
-class MP3FrameParser
-{
-public:
-  explicit MP3FrameParser(int64_t aLength=-1);
-
-  bool IsMP3() {
-    MutexAutoLock mon(mLock);
-    return mIsMP3 != NOT_MP3;
-  }
-
-  void Parse(const uint8_t* aBuffer, uint32_t aLength, uint64_t aStreamOffset);
-
-  // Returns the duration, in microseconds. If the entire stream has not
-  // been parsed yet, this is an estimate based on the bitrate of the
-  // frames parsed so far.
-  int64_t GetDuration();
-
-  // Returns the offset of the first MP3 frame in the stream, or -1 of
-  // no MP3 frame has been detected yet.
-  int64_t GetMP3Offset();
-
-  // Returns true if we've seen the whole first frame of the MP3 stream, and
-  // therefore can make an estimate on the stream duration.
-  // Otherwise, returns false.
-  bool ParsedHeaders();
-
-  // Returns true if we know the exact duration of the MP3 stream;
-  // false otherwise.
-  bool HasExactDuration();
-
-  // Returns true if the parser needs more data for duration estimation.
-  bool NeedsData();
-  // Assign the total lenght of this mp3 stream
-  void SetLength(int64_t aLength) {
-    MutexAutoLock mon(mLock);
-    mLength = aLength;
-  }
-private:
-
-  // Parses aBuffer, starting at offset 0. Returns the number of bytes
-  // parsed, relative to the start of the buffer. Note this may be
-  // greater than aLength if the headers in the buffer indicate that
-  // the frame or ID3 tag extends outside of aBuffer. Returns failure
-  // if too many non-MP3 bytes are parsed.
-  nsresult ParseBuffer(const uint8_t* aBuffer,
-                       uint32_t aLength,
-                       int64_t aStreamOffset,
-                       uint32_t* aOutBytesRead);
-
-  // A low-contention lock for protecting the parser results
-  Mutex mLock;
-
-  // ID3 header parser. Keeps state between reads in case the header falls
-  // in between.
-  ID3Parser mID3Parser;
-
-  // MP3 frame header parser.
-  MP3Parser mMP3Parser;
-
-  // If we read |MAX_SKIPPED_BYTES| from the stream without finding any MP3
-  // frames, we give up and report |NOT_MP3|. Here we track the cumulative size
-  // of any ID3 headers we've seen so big ID3 sections aren't counted towards
-  // skipped bytes.
-  uint32_t mTotalID3Size;
-
-  // All fields below are protected by mLock
-
-  // We keep stats on the size of all the frames we've seen, as well as how many
-  // so that we can estimate the duration of the rest of the stream.
-  uint64_t mTotalFrameSize;
-  uint64_t mFrameCount;
-
-  // Offset of the last data parsed. This is the end offset of the last data
-  // block parsed, so it's the start offset we expect to get on the next
-  // call to Parse().
-  uint64_t mOffset;
-
-  // Total length of the stream in bytes.
-  int64_t mLength;
-
-  // Offset of first MP3 frame in the bitstream. Has value -1 until the
-  // first MP3 frame is found.
-  int64_t mMP3Offset;
-
-  // The exact number of frames in this stream, if we know it. -1 otherwise.
-  int64_t mNumFrames;
-
-  // Number of audio samples per second and per frame. Fixed through the whole
-  // file. If we know these variables as well as the number of frames in the
-  // file, we can get an exact duration for the stream.
-  uint16_t mSamplesPerSecond;
-  uint16_t mSamplesPerFrame;
-
-  // If the MP3 has a variable bitrate, then there *should* be metadata about
-  // the encoding in the first frame. We buffer the first frame here.
-  nsCString mFirstFrame;
-
-  // While we are reading the first frame, this is the stream offset of the
-  // last byte of that frame. -1 at all other times.
-  int64_t mFirstFrameEnd;
-
-  enum eIsMP3 {
-    MAYBE_MP3, // We're giving the stream the benefit of the doubt...
-    DEFINITELY_MP3, // We've hit at least one ID3 tag or MP3 frame.
-    NOT_MP3 // Not found any evidence of the stream being MP3.
-  };
-
-  eIsMP3 mIsMP3;
-
-};
-
-} // namespace mozilla
-
-#endif