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decoder/dsf: use the block count internally

This commit is contained in:
Max Kellermann 2014-08-23 13:50:14 +02:00
parent 1f642238a7
commit f78527d1e3
1 changed files with 10 additions and 10 deletions
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20
src/decoder/plugins/DsfDecoderPlugin.cxx
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@ -42,11 +42,12 @@
#include <string.h>
static constexpr unsigned DSF_BLOCK_SIZE = 4096;
static constexpr unsigned DSF_BLOCK_BITS = DSF_BLOCK_SIZE * 8;
struct DsfMetaData {
unsigned sample_rate, channels;
bool bitreverse;
offset_type chunk_size;
offset_type n_blocks;
#ifdef HAVE_ID3TAG
offset_type id3_offset;
#endif
@ -170,7 +171,8 @@ dsf_read_metadata(Decoder *decoder, InputStream &is,
if (data_size > playable_size)
data_size = playable_size;
metadata->chunk_size = data_size;
const size_t block_size = channels * DSF_BLOCK_SIZE;
metadata->n_blocks = data_size / block_size;
metadata->channels = channels;
metadata->sample_rate = samplefreq;
#ifdef HAVE_ID3TAG
@ -247,7 +249,7 @@ InterleaveDsfBlock(uint8_t *gcc_restrict dest, const uint8_t *gcc_restrict src,
static bool
dsf_decode_chunk(Decoder &decoder, InputStream &is,
unsigned channels, unsigned sample_rate,
offset_type chunk_size,
offset_type n_blocks,
bool bitreverse)
{
/* worst-case buffer size */
@ -255,8 +257,6 @@ dsf_decode_chunk(Decoder &decoder, InputStream &is,
const size_t block_size = channels * DSF_BLOCK_SIZE;
const offset_type n_blocks = chunk_size / block_size;
for (offset_type i = 0; i < n_blocks;) {
if (!decoder_read_full(&decoder, is, buffer, block_size))
return false;
@ -306,8 +306,8 @@ dsf_stream_decode(Decoder &decoder, InputStream &is)
return;
}
/* Calculate song time from DSD chunk size and sample frequency */
offset_type chunk_size = metadata.chunk_size;
float songtime = ((chunk_size / metadata.channels) * 8) /
const auto n_blocks = metadata.n_blocks;
float songtime = float(n_blocks * DSF_BLOCK_BITS) /
(float) metadata.sample_rate;
/* success: file was recognized */
@ -315,7 +315,7 @@ dsf_stream_decode(Decoder &decoder, InputStream &is)
if (!dsf_decode_chunk(decoder, is, metadata.channels,
metadata.sample_rate,
chunk_size,
n_blocks,
metadata.bitreverse))
return;
}
@ -338,8 +338,8 @@ dsf_scan_stream(InputStream &is,
return false;
/* calculate song time and add as tag */
unsigned songtime = ((metadata.chunk_size / metadata.channels) * 8) /
metadata.sample_rate;
unsigned songtime = (metadata.n_blocks * DSF_BLOCK_BITS) /
metadata.sample_rate;
tag_handler_invoke_duration(handler, handler_ctx, songtime);
#ifdef HAVE_ID3TAG