mediaplayer/supplier/MediaTrackAudioSupplier.cpp

128 MediaTrackAudioSupplier::Read(void* buffer, int64 pos, int64 frames)
131 		frames);
134 //printf("MediaTrackAudioSupplier::Read(%p, %lld, %lld)\n", buffer, pos, frames);
144 	// Fill the frames after the end of the track with silence.
145 	if (fCountFrames > 0 && pos + frames > fCountFrames) {
147 		ReadSilence(SkipFrames(buffer, size), frames - size);
148 		frames = size;
151 	TRACE("  after eliminating the frames after the track end: %p, %lld, %lld\n",
152 		buffer, pos, frames);
181 printf("  need to skip %lld frames\n", pos - keyFrame);
184 printf("  skipped %lu frames (full buffer)\n", framesPerBuffer);
191 printf("  skipped %lu frames (rest)\n", framesPerBuffer);
196 	while (frames > 0) {
197 printf("  reading %lu frames (full buffer)\n", framesPerBuffer);
198 		int64 sizeToRead = min_c(size, frames * bytesPerFrame);
201 		frames -= framesPerBuffer;
206 	// read the cached frames
208 	if (frames > 0)
209 		_ReadCachedFrames(buffer, pos, frames, time);
211 	TRACE("  after reading from cache: %p, %lld, %lld\n", buffer, pos, frames);
213 	// read the remaining (uncached) frames
214 	if (frames > 0)
215 		_ReadUncachedFrames(buffer, pos, frames, time);
259 	// Find out, if the track has key frames: as a heuristic we
298 // copies /frames/ frames at position /position/ from the source to the
304 							  int64 position, int64 frames) const
311 	memcpy(target, source, frames * frameSize);
317 // copies /frames/ frames at position /position/ from the source to the
323 							  int64 position, int64 frames) const
326 				frames);
444 								 int64 frames) const
451 		int32 endFrame = min(position + frames, buffer->offset + buffer->size);
499 // buffer pointer as well as position and number of frames are adjusted
504 	int64& frames, bigtime_t time)
509 	_GetBuffersFor(buffers, pos, frames);
516 			int64 size = min(frames, buffer->offset + buffer->size - pos);
519 			frames -= size;
529 		if (buffer->offset < pos + frames
530 			&& buffer->offset + buffer->size >= pos + frames) {
532 			int64 size = min(frames, pos + frames - buffer->offset);
534 						pos + frames - size, size);
535 			frames -= size;
542 /*!	Reads /frames/ frames from /position/ into /buffer/. The frames are not
543 	read from the cache, but read frames are cached, if possible.
549 	int64 frames, bigtime_t time)
555 	if (frames > 0) {
562 	// read the frames
563 	// TODO: Calculate timeout, 0.25 times duration of "frames" seems good.
565 	while (error == B_OK && frames > 0) {
571 			int64 size = min(position + frames,
577 				frames -= size;
588 	// Ensure that all frames up to the next key frame are cached.
610 	if (error != B_OK && frames > 0)
611 		ReadSilence(buffer, frames);