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audiosource.cpp

//  Copyright (c) 2007-2009 Fredrik Mellbin
//
//  Permission is hereby granted, free of charge, to any person obtaining a copy
//  of this software and associated documentation files (the "Software"), to deal
//  in the Software without restriction, including without limitation the rights
//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
//  copies of the Software, and to permit persons to whom the Software is
//  furnished to do so, subject to the following conditions:
//
//  The above copyright notice and this permission notice shall be included in
//  all copies or substantial portions of the Software.
//
//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
//  THE SOFTWARE.

#include "audiosource.h"

/* Audio Cache */

TAudioBlock::TAudioBlock(int64_t Start, int64_t Samples, uint8_t *SrcData, size_t SrcBytes) {
      this->Start = Start;
      this->Samples = Samples;
      Data = new uint8_t[SrcBytes];
      memcpy(Data, SrcData, SrcBytes);
}

TAudioBlock::~TAudioBlock() {
      delete[] Data;
}

TAudioCache::TAudioCache() {
      MaxCacheBlocks = 0;
      BytesPerSample = 0;
}

TAudioCache::~TAudioCache() {
      for (TAudioCache::iterator it=begin(); it != end(); it++)
            delete *it;
}

void TAudioCache::Initialize(int BytesPerSample, int MaxCacheBlocks) {
      this->BytesPerSample = BytesPerSample;
      this->MaxCacheBlocks = MaxCacheBlocks;
}

void TAudioCache::CacheBlock(int64_t Start, int64_t Samples, uint8_t *SrcData) {
      if (BytesPerSample > 0) {
            for (TAudioCache::iterator it=begin(); it != end(); it++) {
                  if ((*it)->Start == Start) {
                        delete *it;
                        erase(it);
                        break;
                  }
            }

            push_front(new TAudioBlock(Start, Samples, SrcData, static_cast<size_t>(Samples * BytesPerSample)));
            if (static_cast<int>(size()) >= MaxCacheBlocks) {
                  delete back();
                  pop_back();
            }
      }
}

bool TAudioCache::AudioBlockComp(TAudioBlock *A, TAudioBlock *B) {
      return A->Start < B->Start;
}

int64_t TAudioCache::FillRequest(int64_t Start, int64_t Samples, uint8_t *Dst) {
      // May be better to move used blocks to the front
      std::list<TAudioBlock *> UsedBlocks;
      for (TAudioCache::iterator it=begin(); it != end(); it++) {
            int64_t SrcOffset = FFMAX(0, Start - (*it)->Start);
            int64_t DstOffset = FFMAX(0, (*it)->Start - Start);
            int64_t CopySamples = FFMIN((*it)->Samples - SrcOffset, Samples - DstOffset);
            if (CopySamples > 0) {
                  memcpy(Dst + DstOffset * BytesPerSample, (*it)->Data + SrcOffset * BytesPerSample, static_cast<size_t>(CopySamples * BytesPerSample));
                  UsedBlocks.push_back(*it);
            }
      }
      UsedBlocks.sort(AudioBlockComp);
      int64_t Ret = Start;
      for (std::list<TAudioBlock *>::iterator it = UsedBlocks.begin(); it != UsedBlocks.end(); it++) {
            if (it == UsedBlocks.begin() || Ret == (*it)->Start)
                  Ret = (*it)->Start + (*it)->Samples;
            else
                  break;
      }
      return FFMIN(Ret, Start + Samples);
}

/* FFMS_AudioSource base class */

FFMS_AudioSource::FFMS_AudioSource(const char *SourceFile, FFMS_Index *Index, int Track) : DecodingBuffer(AVCODEC_MAX_AUDIO_FRAME_SIZE * 10), CurrentSample(0) {
      if (Track < 0 || Track >= static_cast<int>(Index->size()))
            throw FFMS_Exception(FFMS_ERROR_INDEX, FFMS_ERROR_INVALID_ARGUMENT,
                  "Out of bounds track index selected");

      if (Index->at(Track).TT != FFMS_TYPE_AUDIO)
            throw FFMS_Exception(FFMS_ERROR_INDEX, FFMS_ERROR_INVALID_ARGUMENT,
                  "Not an audio track");

      if (Index[Track].size() == 0)
            throw FFMS_Exception(FFMS_ERROR_INDEX, FFMS_ERROR_INVALID_ARGUMENT,
                  "Audio track contains no audio frames");

      if (!Index->CompareFileSignature(SourceFile))
            throw FFMS_Exception(FFMS_ERROR_INDEX, FFMS_ERROR_FILE_MISMATCH,
                  "The index does not match the source file");
}

FFMS_AudioSource::~FFMS_AudioSource() {

}

void FFMS_AudioSource::GetAudioCheck(int64_t Start, int64_t Count) {
      if (Start < 0 || Start + Count > AP.NumSamples)
            throw FFMS_Exception(FFMS_ERROR_DECODING, FFMS_ERROR_INVALID_ARGUMENT,
                  "Out of bounds audio samples requested");
}

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