audio_format: remove SAMPLE_FORMAT_DSD_OVER_USB

DSD-over-USB should not be a MPD core format, because it is not a
"natural" format; it is just a temnporary over-the-wire format.  This
format has been implemented in pcm_export, and does not need to be
supported by pcm_convert.

src/audio_format.c

@@ -29,15 +29,6 @@ audio_format_mask_apply(struct audio_format *af,
 	assert(audio_format_valid(af));
 	assert(audio_format_mask_valid(mask));
 
-	if (af->format == SAMPLE_FORMAT_DSD &&
-	    mask->format == SAMPLE_FORMAT_DSD_OVER_USB &&
-	    mask->sample_rate == 0)
-		/* each DSD-over-USB sample contains 2 DSD bytes (16
-		   DSD bits), which means the sample rate must be
-		   halved; this is not the real 1 bit sample rate, but
-		   MPD's point of view */
-		af->sample_rate /= 2;
-
 	if (mask->sample_rate != 0)
 		af->sample_rate = mask->sample_rate;
 
@@ -74,9 +65,6 @@ sample_format_to_string(enum sample_format format)
 
 	case SAMPLE_FORMAT_DSD:
 		return "dsd";
-
-	case SAMPLE_FORMAT_DSD_OVER_USB:
-		return "dsdusb";
 	}
 
 	/* unreachable */

src/audio_format.h

@@ -50,13 +50,6 @@ enum sample_format {
 	 * byte (8 samples) per channel.
 	 */
 	SAMPLE_FORMAT_DSD,
-
-	/**
-	 * DSD packed in 24 bit samples (padded to 32 bit), according
-	 * to the dCS suggested standard:
-	 * http://www.dcsltd.co.uk/page/assets/DSDoverUSB.pdf
-	 */
-	SAMPLE_FORMAT_DSD_OVER_USB,
 };
 
 static const unsigned MAX_CHANNELS = 8;
@@ -174,7 +167,6 @@ audio_valid_sample_format(enum sample_format format)
 	case SAMPLE_FORMAT_S32:
 	case SAMPLE_FORMAT_FLOAT:
 	case SAMPLE_FORMAT_DSD:
-	case SAMPLE_FORMAT_DSD_OVER_USB:
 		return true;
 
 	case SAMPLE_FORMAT_UNDEFINED:
@@ -245,7 +237,6 @@ sample_format_size(enum sample_format format)
 	case SAMPLE_FORMAT_S24_P32:
 	case SAMPLE_FORMAT_S32:
 	case SAMPLE_FORMAT_FLOAT:
-	case SAMPLE_FORMAT_DSD_OVER_USB:
 		return 4;
 
 	case SAMPLE_FORMAT_DSD:

src/audio_parser.c

@@ -87,12 +87,6 @@ parse_sample_format(const char *src, bool mask,
 		return true;
 	}
 
-	if (memcmp(src, "dsdusb", 6) == 0) {
-		*sample_format_r = SAMPLE_FORMAT_DSD_OVER_USB;
-		*endptr_r = src + 6;
-		return true;
-	}
-
 	if (memcmp(src, "dsd", 3) == 0) {
 		*sample_format_r = SAMPLE_FORMAT_DSD;
 		*endptr_r = src + 3;

src/decoder/flac_pcm.c

@@ -103,7 +103,6 @@ flac_convert(void *dest,
 
 	case SAMPLE_FORMAT_FLOAT:
 	case SAMPLE_FORMAT_DSD:
-	case SAMPLE_FORMAT_DSD_OVER_USB:
 	case SAMPLE_FORMAT_UNDEFINED:
 		/* unreachable */
 		assert(false);

src/output/alsa_output_plugin.c

@@ -227,7 +227,6 @@ get_bitformat(enum sample_format sample_format)
 	switch (sample_format) {
 	case SAMPLE_FORMAT_UNDEFINED:
 	case SAMPLE_FORMAT_DSD:
-	case SAMPLE_FORMAT_DSD_OVER_USB:
 		return SND_PCM_FORMAT_UNKNOWN;
 
 	case SAMPLE_FORMAT_S8:

src/output/oss_output_plugin.c

@@ -433,7 +433,6 @@ sample_format_to_oss(enum sample_format format)
 	case SAMPLE_FORMAT_UNDEFINED:
 	case SAMPLE_FORMAT_FLOAT:
 	case SAMPLE_FORMAT_DSD:
-	case SAMPLE_FORMAT_DSD_OVER_USB:
 		return AFMT_QUERY;
 
 	case SAMPLE_FORMAT_S8:

src/pcm_convert.c

@@ -22,7 +22,6 @@
 #include "pcm_channels.h"
 #include "pcm_format.h"
 #include "pcm_pack.h"
-#include "pcm_dsd_usb.h"
 #include "audio_format.h"
 #include "glib_compat.h"
 
@@ -76,7 +75,6 @@ pcm_convert_channels(struct pcm_buffer *buffer, enum sample_format format,
 	case SAMPLE_FORMAT_S8:
 	case SAMPLE_FORMAT_FLOAT:
 	case SAMPLE_FORMAT_DSD:
-	case SAMPLE_FORMAT_DSD_OVER_USB:
 		g_set_error(error_r, pcm_convert_quark(), 0,
 			    "Channel conversion not implemented for format '%s'",
 			    sample_format_to_string(format));
@@ -326,40 +324,6 @@ pcm_convert(struct pcm_convert_state *state,
 	    size_t *dest_size_r,
 	    GError **error_r)
 {
-	struct audio_format usb_format;
-
-	if (src_format->format == SAMPLE_FORMAT_DSD &&
-	    dest_format->format == SAMPLE_FORMAT_DSD_OVER_USB) {
-		size_t u_size;
-		const uint32_t *u = pcm_dsd_to_usb(&state->dsd.buffer,
-						   src_format->channels,
-						   src, src_size,
-						   &u_size);
-		if (u == NULL) {
-			g_set_error_literal(error_r, pcm_convert_quark(), 0,
-					    "DSD to USB conversion failed");
-			return NULL;
-		}
-
-		usb_format = *src_format;
-		usb_format.format = SAMPLE_FORMAT_DSD_OVER_USB;
-
-		/* each DSD-over-USB sample contains 2 DSD bytes (16
-		   DSD bits), which means the sample rate must be
-		   halved; this is not the real 1 bit sample rate, but
-		   MPD's point of view */
-		usb_format.sample_rate = usb_format.sample_rate / 2;
-
-		if (audio_format_equals(&usb_format, dest_format)) {
-			*dest_size_r = u_size;
-			return u;
-		}
-
-		src_format = &usb_format;
-		src = u;
-		src_size = u_size;
-	}
-
 	struct audio_format float_format;
 	if (src_format->format == SAMPLE_FORMAT_DSD) {
 		size_t f_size;

src/pcm_export.c

@@ -54,7 +54,7 @@ pcm_export_open(struct pcm_export_state *state,
 		sample_format = SAMPLE_FORMAT_S24_P32;
 
 	state->shift8 = shift8 && sample_format == SAMPLE_FORMAT_S24_P32;
-	state->pack24 = pack && (sample_format == SAMPLE_FORMAT_S24_P32 || sample_format == SAMPLE_FORMAT_DSD_OVER_USB);
+	state->pack24 = pack && sample_format == SAMPLE_FORMAT_S24_P32;
 
 	assert(!state->shift8 || !state->pack24);
 

src/pcm_format.c

@@ -121,7 +121,6 @@ pcm_convert_to_16(struct pcm_buffer *buffer, struct pcm_dither *dither,
 	switch (src_format) {
 	case SAMPLE_FORMAT_UNDEFINED:
 	case SAMPLE_FORMAT_DSD:
-	case SAMPLE_FORMAT_DSD_OVER_USB:
 		break;
 
 	case SAMPLE_FORMAT_S8:
@@ -237,7 +236,6 @@ pcm_convert_to_24(struct pcm_buffer *buffer,
 	switch (src_format) {
 	case SAMPLE_FORMAT_UNDEFINED:
 	case SAMPLE_FORMAT_DSD:
-	case SAMPLE_FORMAT_DSD_OVER_USB:
 		break;
 
 	case SAMPLE_FORMAT_S8:
@@ -345,7 +343,6 @@ pcm_convert_to_32(struct pcm_buffer *buffer,
 	switch (src_format) {
 	case SAMPLE_FORMAT_UNDEFINED:
 	case SAMPLE_FORMAT_DSD:
-	case SAMPLE_FORMAT_DSD_OVER_USB:
 		break;
 
 	case SAMPLE_FORMAT_S8:
@@ -463,7 +460,6 @@ pcm_convert_to_float(struct pcm_buffer *buffer,
 	switch (src_format) {
 	case SAMPLE_FORMAT_UNDEFINED:
 	case SAMPLE_FORMAT_DSD:
-	case SAMPLE_FORMAT_DSD_OVER_USB:
 		break;
 
 	case SAMPLE_FORMAT_S8:

src/pcm_mix.c

@@ -120,7 +120,6 @@ pcm_add_vol(void *buffer1, const void *buffer2, size_t size,
 	switch (format) {
 	case SAMPLE_FORMAT_UNDEFINED:
 	case SAMPLE_FORMAT_DSD:
-	case SAMPLE_FORMAT_DSD_OVER_USB:
 		/* not implemented */
 		return false;
 
@@ -230,7 +229,6 @@ pcm_add(void *buffer1, const void *buffer2, size_t size,
 	switch (format) {
 	case SAMPLE_FORMAT_UNDEFINED:
 	case SAMPLE_FORMAT_DSD:
-	case SAMPLE_FORMAT_DSD_OVER_USB:
 		/* not implemented */
 		return false;
 

src/pcm_volume.c

@@ -159,7 +159,6 @@ pcm_volume(void *buffer, size_t length,
 	switch (format) {
 	case SAMPLE_FORMAT_UNDEFINED:
 	case SAMPLE_FORMAT_DSD:
-	case SAMPLE_FORMAT_DSD_OVER_USB:
 		/* not implemented */
 		return false;