Aegisub/FFmpegSource/ffaudiobase.cpp

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// Copyright (c) 2007-2008 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 "ffmpegsource.h"
FFAudioBase::FFAudioBase() {
memset(&VI, 0, sizeof(VI));
DecodingBuffer = new uint8_t[AVCODEC_MAX_AUDIO_FRAME_SIZE];
};
FFAudioBase::~FFAudioBase() {
delete[] DecodingBuffer;
};
size_t FFAudioBase::FindClosestAudioKeyFrame(int64_t Sample) {
for (size_t i = 0; i < SI.size(); i++) {
if (SI[i].SampleStart == Sample && SI[i].KeyFrame)
return i;
else if (SI[i].SampleStart > Sample && SI[i].KeyFrame)
return i - 1;
}
return SI.size() - 1;
}
bool FFAudioBase::LoadSampleInfoFromFile(const char *AAudioCacheFile, const char *ASource, int AAudioTrack) {
char DefaultCacheFilename[1024];
sprintf(DefaultCacheFilename, "%s.ffas%dcache", ASource, AAudioTrack);
if (!strcmp(AAudioCacheFile, ""))
AAudioCacheFile = DefaultCacheFilename;
FILE *CacheFile = fopen(AAudioCacheFile, "r");
if (!CacheFile)
return false;
size_t AudioBlocks = 0;
if (fscanf(CacheFile, "%lld %u\r\n", &VI.num_audio_samples, &AudioBlocks) <= 0 || VI.num_audio_samples <= 0 || AudioBlocks <= 0) {
VI.num_audio_samples = 0;
fclose(CacheFile);
return false;
}
for (size_t i = 0; i < AudioBlocks; i++) {
int64_t SampleStart;
int64_t FilePos;
unsigned int FrameSize;
int Flags;
fscanf(CacheFile, "%lld %lld %u %d\r\n", &SampleStart, &FilePos, &FrameSize, &Flags);
SI.push_back(SampleInfo(SampleStart, FilePos, FrameSize, (Flags & 1) != 0));
}
fclose(CacheFile);
return true;
}
bool FFAudioBase::SaveSampleInfoToFile(const char *AAudioCacheFile, const char *ASource, int AAudioTrack) {
char DefaultCacheFilename[1024];
sprintf(DefaultCacheFilename, "%s.ffas%dcache", ASource, AAudioTrack);
if (!strcmp(AAudioCacheFile, ""))
AAudioCacheFile = DefaultCacheFilename;
FILE *CacheFile = fopen(AAudioCacheFile, "wb");
if (!CacheFile)
return false;
fprintf(CacheFile, "%lld %u\r\n", VI.num_audio_samples, SI.size());
for (size_t i = 0; i < SI.size(); i++) {
int Flags = SI[i].KeyFrame ? 1 : 0;
fprintf(CacheFile, "%lld %lld %u %d\r\n", SI[i].SampleStart, SI[i].FilePos, SI[i].FrameSize, Flags);
}
fclose(CacheFile);
return true;
}