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-rw-r--r--src/output/alsa_output_plugin.c4
-rw-r--r--src/pcm_export.c21
-rw-r--r--src/pcm_export.h8
3 files changed, 30 insertions, 3 deletions
diff --git a/src/output/alsa_output_plugin.c b/src/output/alsa_output_plugin.c
index cf3370d01..5107d0a94 100644
--- a/src/output/alsa_output_plugin.c
+++ b/src/output/alsa_output_plugin.c
@@ -674,9 +674,7 @@ alsa_open(struct audio_output *ao, struct audio_format *audio_format, GError **e
}
ad->in_frame_size = audio_format_frame_size(audio_format);
- ad->out_frame_size = ad->export.pack24
- ? (size_t)(audio_format->channels * 3)
- : ad->in_frame_size;
+ ad->out_frame_size = pcm_export_frame_size(&ad->export, audio_format);
return true;
}
diff --git a/src/pcm_export.c b/src/pcm_export.c
index e586b51d2..824b41b18 100644
--- a/src/pcm_export.c
+++ b/src/pcm_export.c
@@ -70,6 +70,27 @@ pcm_export_open(struct pcm_export_state *state,
}
}
+size_t
+pcm_export_frame_size(const struct pcm_export_state *state,
+ const struct audio_format *audio_format)
+{
+ assert(state != NULL);
+ assert(audio_format != NULL);
+
+ if (state->pack24)
+ /* packed 24 bit samples (3 bytes per sample) */
+ return audio_format->channels * 3;
+
+ if (state->dsd_usb)
+ /* the DSD-over-USB draft says that DSD 1-bit samples
+ are enclosed within 24 bit samples, and MPD's
+ representation of 24 bit is padded to 32 bit (4
+ bytes per sample) */
+ return audio_format->channels * 4;
+
+ return audio_format_frame_size(audio_format);
+}
+
const void *
pcm_export(struct pcm_export_state *state, const void *data, size_t size,
size_t *dest_size_r)
diff --git a/src/pcm_export.h b/src/pcm_export.h
index 418dcdfa3..a7e7c3f68 100644
--- a/src/pcm_export.h
+++ b/src/pcm_export.h
@@ -115,6 +115,14 @@ pcm_export_open(struct pcm_export_state *state,
bool dsd_usb, bool shift8, bool pack, bool reverse_endian);
/**
+ * Calculate the size of one output frame.
+ */
+G_GNUC_PURE
+size_t
+pcm_export_frame_size(const struct pcm_export_state *state,
+ const struct audio_format *audio_format);
+
+/**
* Export a PCM buffer.
*
* @param state an initialized and open pcm_export_state object