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decoder/dsdiff: refactor the main decoder loop 

Check for STOP before decoding the first chunk.  This reduces the
command latency.
This commit is contained in:
Max Kellermann 2014-08-23 15:25:40 +02:00
parent 4259b17b91
commit 6d7eaba845
1 changed files with 4 additions and 17 deletions
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21
src/decoder/plugins/DsdiffDecoderPlugin.cxx
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@ -365,8 +365,9 @@ dsdiff_decode_chunk(Decoder &decoder, InputStream &is,
const unsigned buffer_frames = sizeof(buffer) / frame_size; const unsigned buffer_frames = sizeof(buffer) / frame_size;
const size_t buffer_size = buffer_frames * frame_size; const size_t buffer_size = buffer_frames * frame_size;
auto cmd = decoder_get_command(decoder);
for (offset_type remaining_bytes = total_bytes; for (offset_type remaining_bytes = total_bytes;
remaining_bytes >= frame_size;) { remaining_bytes >= frame_size && cmd != DecoderCommand::STOP;) {
/* see how much aligned data from the remaining chunk /* see how much aligned data from the remaining chunk
fits into the local buffer */ fits into the local buffer */
size_t now_size = buffer_size; size_t now_size = buffer_size;
@ -384,22 +385,8 @@ dsdiff_decode_chunk(Decoder &decoder, InputStream &is,
if (lsbitfirst) if (lsbitfirst)
bit_reverse_buffer(buffer, buffer + nbytes); bit_reverse_buffer(buffer, buffer + nbytes);
const auto cmd = decoder_data(decoder, is, buffer, nbytes, cmd = decoder_data(decoder, is, buffer, nbytes,
sample_rate / 1000); sample_rate / 1000);
switch (cmd) {
case DecoderCommand::NONE:
break;
case DecoderCommand::START:
case DecoderCommand::STOP:
return false;
case DecoderCommand::SEEK:
/* Not implemented yet */
decoder_seek_error(decoder);
break;
}
} }
return true; return true;