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authorMax Kellermann <max@duempel.org>2014-08-23 13:50:14 +0200
committerMax Kellermann <max@duempel.org>2014-08-23 13:51:08 +0200
commitf78527d1e38bd9aedcfde4c32757b597d2004b62 (patch)
tree0cd1708259aeddf1a871c2a941ddfdcf184d3cf2 /src
parent1f642238a7022aac403246d9f6cb3f2951a96052 (diff)
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decoder/dsf: use the block count internally
Diffstat (limited to '')
-rw-r--r--src/decoder/plugins/DsfDecoderPlugin.cxx20
1 files changed, 10 insertions, 10 deletions
diff --git a/src/decoder/plugins/DsfDecoderPlugin.cxx b/src/decoder/plugins/DsfDecoderPlugin.cxx
index 5a2ac61e3..0f0739e37 100644
--- a/src/decoder/plugins/DsfDecoderPlugin.cxx
+++ b/src/decoder/plugins/DsfDecoderPlugin.cxx
@@ -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