src/add-ons/media/plugins/musepack/MusePackDecoder.cpp

   1 /*
   2 ** Copyright 2004, Axel Dörfler, axeld@pinc-software.de. All rights reserved.
   3 ** Distributed under the terms of the MIT License.
   4 */
   5
   6 #include <stdio.h>
   7 #include <string.h>
   8 #include "MusePackDecoder.h"
   9 #include "mpc/in_mpc.h"
  10
  11
  12 MusePackDecoder::MusePackDecoder()
  13         :
  14         fDecoder(NULL)
  15 {
  16 }
  17
  18
  19 MusePackDecoder::~MusePackDecoder()
  20 {
  21         delete fDecoder;
  22 }
  23
  24
  25 void
  26 MusePackDecoder::GetCodecInfo(media_codec_info *info)
  27 {
  28         strcpy(info->short_name, "musepack");
  29         strcpy(info->pretty_name, "MusePack audio codec based on mpcdec by Andree Buschmann");
  30 }
  31
  32
  33 status_t
  34 MusePackDecoder::Setup(media_format *ioEncodedFormat, const void *infoBuffer, size_t infoSize)
  35 {
  36         if (infoBuffer == NULL || infoSize != sizeof(MPC_decoder))
  37                 return B_BAD_VALUE;
  38
  39         fDecoder = (MPC_decoder *)infoBuffer;
  40         fFrameRate = fDecoder->fInfo->simple.SampleFreq;
  41         fFramePosition = 0;
  42         return B_OK;
  43 }
  44
  45
  46 status_t
  47 MusePackDecoder::NegotiateOutputFormat(media_format *format)
  48 {
  49         // ToDo: rework the underlying MPC engine to be more flexible
  50
  51         format->type = B_MEDIA_RAW_AUDIO;
  52         format->u.raw_audio.frame_rate = fFrameRate;
  53         format->u.raw_audio.channel_count = fDecoder->fInfo->simple.Channels;
  54         format->u.raw_audio.format = media_raw_audio_format::B_AUDIO_FLOAT;
  55         format->u.raw_audio.byte_order = B_MEDIA_HOST_ENDIAN;
  56         format->u.raw_audio.buffer_size = sizeof(MPC_SAMPLE_FORMAT) * FRAMELEN * 2;
  57                 // the buffer size is hardcoded in the MPC engine...
  58
  59         if (format->u.raw_audio.channel_mask == 0) {
  60                 format->u.raw_audio.channel_mask = (format->u.raw_audio.channel_count == 1) ?
  61                         B_CHANNEL_LEFT : B_CHANNEL_LEFT | B_CHANNEL_RIGHT;
  62         }
  63
  64         return B_OK;
  65 }
  66
  67
  68 status_t
  69 MusePackDecoder::SeekedTo(int64 frame, bigtime_t time)
  70 {
  71         fFramePosition = 0;
  72         return B_ERROR;
  73 }
  74
  75
  76 status_t
  77 MusePackDecoder::Decode(void *buffer, int64 *_frameCount, media_header *mediaHeader, media_decode_info *info)
  78 {
  79         // ToDo: add error checking (check for broken frames)
  80
  81         mediaHeader->start_time = (bigtime_t) ((1000 * fFramePosition) / (fFrameRate / 1000.0));
  82
  83 //      printf("MusePackDecoder::Decode, start-time %.3f, played-frames %Ld\n", mediaHeader->start_time / 1000000.0, fFramePosition);
  84
  85         uint32 ring = fDecoder->Zaehler;
  86         int frameCount = fDecoder->DECODE((MPC_SAMPLE_FORMAT *)buffer);
  87         frameCount /= 2;
  88         fDecoder->UpdateBuffer(ring);
  89
  90         fFramePosition += frameCount;
  91         *_frameCount = frameCount;
  92
  93         return frameCount > 0 ? B_OK : B_LAST_BUFFER_ERROR;
  94 }
  95