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108 lines
2.7 KiB
C++
108 lines
2.7 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim:set ts=2 sw=2 sts=2 et cindent: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_MiniMP3Decoder_h
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#define mozilla_MiniMP3Decoder_h
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#include "PlatformDecoderModule.h"
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#include "mozilla/ReentrantMonitor.h"
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#include "mozilla/Vector.h"
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#include "nsIThread.h"
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/* relevant bits from minimp3 */
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#define MP3_FRAME_SIZE 1152
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#define MP3_MAX_CODED_FRAME_SIZE 1792
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#define MP3_MAX_CHANNELS 2
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#define MAXIMUM_ALLOWABLE_FRAME_SIZE 524288
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#define SBLIMIT 32
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#define MP3_STEREO 0
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#define MP3_JSTEREO 1
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#define MP3_DUAL 2
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#define MP3_MONO 3
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#define HEADER_SIZE 4
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#define BACKSTEP_SIZE 512
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#define EXTRABYTES 24
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#define VLC_TYPE int16_t
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#define MP3_MAX_SAMPLES_PER_FRAME (1152*2)
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#define TABLE_4_3_SIZE (8191 + 16)*4
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struct bitstream_t {
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const uint8_t *buffer, *buffer_end;
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int index;
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int size_in_bits;
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};
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typedef void* mp3_decoder_t;
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struct mp3_info_t {
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int sample_rate;
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int channels;
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int audio_bytes; // generated amount of audio per frame
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};
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struct mp3_context_t {
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uint8_t last_buf[2*BACKSTEP_SIZE + EXTRABYTES];
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int last_buf_size;
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int frame_size;
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uint32_t free_format_next_header;
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int error_protection;
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int sample_rate;
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int sample_rate_index;
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int bit_rate;
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bitstream_t gb;
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bitstream_t in_gb;
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int nb_channels;
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int mode;
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int mode_ext;
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int lsf;
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int16_t synth_buf[MP3_MAX_CHANNELS][512 * 2];
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int synth_buf_offset[MP3_MAX_CHANNELS];
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int32_t sb_samples[MP3_MAX_CHANNELS][36][SBLIMIT];
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int32_t mdct_buf[MP3_MAX_CHANNELS][SBLIMIT * 18];
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int dither_state;
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};
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extern "C" int mp3_init(mp3_context_t *dec);
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extern "C" int mp3_close(mp3_context_t *dec);
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extern "C" int mp3_decode(mp3_context_t *dec, void *buf, int bytes,
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signed short *out, mp3_info_t *info);
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namespace mozilla {
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class FlushableTaskQueue;
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class MediaDataDecoderCallback;
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class MiniMP3Decoder : public MediaDataDecoder {
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public:
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MiniMP3Decoder(const AudioInfo& aConfig,
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FlushableTaskQueue* aVideoTaskQueue,
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MediaDataDecoderCallback* aCallback);
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virtual ~MiniMP3Decoder();
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RefPtr<InitPromise> Init() override;
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nsresult Input(MediaRawData* aSample) override;
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nsresult Flush() override;
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nsresult Drain() override;
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nsresult Shutdown() override;
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private:
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mp3_info_t mMP3Info;
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mp3_context_t mMP3Decoder;
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RefPtr<FlushableTaskQueue> mTaskQueue;
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MediaDataDecoderCallback* mCallback;
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void DecodePacket(MediaRawData* aSample);
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};
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} // namespace mozilla
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#endif // mozilla_MiniMP3Decoder_h
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