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Avoid searching the same area twice in MPEG::File::previousFrameOffset().

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This commit is contained in:
Tsuda Kageyu 2017-02-01 14:23:03 +09:00
parent 87fc4012f4
commit ba98628919
1 changed files with 4 additions and 6 deletions
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10
taglib/mpeg/mpegfile.cpp
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@ -373,15 +373,13 @@ long MPEG::File::previousFrameOffset(long position)
ByteVector frameSyncBytes(2, '\0');
while(position > 0) {
const long size = std::min<long>(position, bufferSize());
position -= size;
const long bufferLength = std::min<long>(position, bufferSize());
position -= bufferLength;
seek(position);
const ByteVector buffer = readBlock(bufferSize());
if(buffer.isEmpty())
return -1;
const ByteVector buffer = readBlock(bufferLength);
for(int i = buffer.size() - 1; i >= 0; i--) {
for(int i = buffer.size() - 1; i >= 0; --i) {
frameSyncBytes[1] = frameSyncBytes[0];
frameSyncBytes[0] = buffer[i];
if(isFrameSync(frameSyncBytes)) {