Minor fixes

README.md

@@ -241,6 +241,13 @@ really opening it (should show "vgmstream" somewhere in the file info), and
 try to remove a few other plugins. foobar's ffmpeg plugin and foo_adpcm are
 known to cause issues.
 
+### Channel issues
+Some games layer a huge number of channels, that are disabled or downmixed
+during gameplay. The player may be unable to play those files (for example
+foobar can only play up to 8 channels, and Winamp depends the your sound
+card). For those files you can set the "downmix" option in vgmstream, that
+can reduce the number of channels to a playable amount. Note that downmixing
+is very simple and not meant to be used when converting to other formats.
 
 ## Tagging
 Some of vgmstream's plugins support simple read-only tagging via external files.
@@ -305,6 +312,7 @@ are used in few games.
 - FMOD FADPCM 4-bit ADPCM
 - Konami XMD 4-bit ADPCM
 - Argonaut ASF 4-bit ADPCM
+- Ocean DSA 4-bit ADPCM
 - Circus XPCM ADPCM
 - OKI 4-bit ADPCM (16-bit output, PC-FX)
 - SDX2 2:1 Squareroot-Delta-Exact compression DPCM

src/coding/ffmpeg_decoder.c

@@ -321,7 +321,7 @@ ffmpeg_codec_data * init_ffmpeg_header_offset_subsong(STREAMFILE *streamFile, ui
     data->offset = start;
     data->size = size;
     if (data->size == 0 || data->start + data->size > get_streamfile_size(streamFile)) {
-        VGM_LOG("FFmpeg: wrong start+size found\n");
+        VGM_LOG("FFPMEG: wrong start+size found: %x + %x > %x \n", (uint32_t)start, (uint32_t)size, get_streamfile_size(streamFile));
         data->size = get_streamfile_size(streamFile) - data->start;
     }
     data->logical_offset = 0;

src/layout/blocked_ea_sns.c

@@ -6,7 +6,6 @@
 void block_update_ea_sns(off_t block_offset, VGMSTREAM * vgmstream) {
     STREAMFILE* streamFile = vgmstream->ch[0].streamfile;
     uint32_t block_id, block_size, block_samples;
-    size_t file_size = get_streamfile_size(streamFile);
     off_t channel_start;
     size_t channel_interleave;
     int i;