audio_format: add DSD sample format

Basic support for Direct Stream Digital.  No conversion yet, and no
decoder/output plugin support.

1 files changed, 19 insertions, 0 deletions

diff --git a/src/audio_format.h b/src/audio_format.h
index 4f7dbfb1..2c86b70b 100644
--- a/src/audio_format.h
+++ b/src/audio_format.h
@@ -49,6 +49,18 @@ enum sample_format {
 	 * range is -1.0f to +1.0f.
 	 */
 	SAMPLE_FORMAT_FLOAT,
+
+	/**
+	 * Direct Stream Digital.  1-bit samples; each frame has one
+	 * byte (8 samples) per channel.
+	 */
+	SAMPLE_FORMAT_DSD,
+
+	/**
+	 * Same as #SAMPLE_FORMAT_DSD, but the least significant bit
+	 * comes first.
+	 */
+	SAMPLE_FORMAT_DSD_LSBFIRST,
 };
 
 static const unsigned MAX_CHANNELS = 8;
@@ -175,6 +187,8 @@ audio_valid_sample_format(enum sample_format format)
 	case SAMPLE_FORMAT_S24_P32:
 	case SAMPLE_FORMAT_S32:
 	case SAMPLE_FORMAT_FLOAT:
+	case SAMPLE_FORMAT_DSD:
+	case SAMPLE_FORMAT_DSD_LSBFIRST:
 		return true;
 
 	case SAMPLE_FORMAT_UNDEFINED:
@@ -251,6 +265,11 @@ sample_format_size(enum sample_format format)
 	case SAMPLE_FORMAT_FLOAT:
 		return 4;
 
+	case SAMPLE_FORMAT_DSD:
+	case SAMPLE_FORMAT_DSD_LSBFIRST:
+		/* each frame has 8 samples per channel */
+		return 1;
+
 	case SAMPLE_FORMAT_UNDEFINED:
 		return 0;
 	}