Audio: PCM converter: Add support for A-law

WIP - still the actual sample converter missing.

Signed-off-by: Seppo Ingalsuo <seppo.ingalsuo@linux.intel.com>

Author: singalsu

src/audio/Kconfig

@@ -174,6 +174,12 @@ config FORMAT_U8
 	help
 	  Support unsigned 8 bit processing data format
 
+config FORMAT_A_LAW
+	bool "Support A-law"
+	default n
+	help
+	  Support 8 bit A-law processing data format.
+
 config FORMAT_S16LE
 	bool "Support S16LE"
 	default y
@@ -222,6 +228,12 @@ config PCM_CONVERTER_FORMAT_U8
 	help
 	  Support 8 bit processing data format without sign
 
+config PCM_CONVERTER_FORMAT_A_LAW
+	bool "Support A-law"
+	default n
+	help
+	  Support 8 bit A-law data format.
+
 config PCM_CONVERTER_FORMAT_S16LE
 	bool "Support S16LE"
 	default y

src/audio/pcm_converter/pcm_converter_generic.c

@@ -93,6 +93,66 @@ static int pcm_convert_s32_to_u8(const struct audio_stream *source,
 }
 #endif /* CONFIG_PCM_CONVERTER_FORMAT_U8 && CONFIG_PCM_CONVERTER_FORMAT_S32LE */
 
+#if CONFIG_PCM_CONVERTER_FORMAT_A_LAW && CONFIG_PCM_CONVERTER_FORMAT_S32LE
+static int pcm_convert_alaw_to_s32(const struct audio_stream *source,
+				   uint32_t ioffset, struct audio_stream *sink,
+				   uint32_t ooffset, uint32_t samples, uint32_t chmap)
+{
+	uint8_t *src = audio_stream_get_rptr(source);
+	int32_t *dst = audio_stream_get_wptr(sink);
+	uint32_t processed;
+	uint32_t nmax, i, n;
+
+	src += ioffset;
+	dst += ooffset;
+	for (processed = 0; processed < samples; processed += n) {
+		src = audio_stream_wrap(source, src);
+		dst = audio_stream_wrap(sink, dst);
+		n = samples - processed;
+		nmax = audio_stream_bytes_without_wrap(source, src) >> BYTES_TO_U8_SAMPLES;
+		n = MIN(n, nmax);
+		nmax = audio_stream_bytes_without_wrap(sink, dst) >> BYTES_TO_S32_SAMPLES;
+		n = MIN(n, nmax);
+		for (i = 0; i < n; i++) {
+			*dst = (INT8_MIN + *src) << 24;
+			src++;
+			dst++;
+		}
+	}
+
+	return samples;
+}
+
+static int pcm_convert_s32_to_alaw(const struct audio_stream *source,
+				   uint32_t ioffset, struct audio_stream *sink,
+				   uint32_t ooffset, uint32_t samples, uint32_t chmap)
+{
+	int32_t *src = audio_stream_get_rptr(source);
+	uint8_t *dst = audio_stream_get_wptr(sink);
+	uint32_t processed;
+	uint32_t nmax, i, n;
+
+	src += ioffset;
+	dst += ooffset;
+	for (processed = 0; processed < samples; processed += n) {
+		src = audio_stream_wrap(source, src);
+		dst = audio_stream_wrap(sink, dst);
+		n = samples - processed;
+		nmax = audio_stream_bytes_without_wrap(source, src) >> BYTES_TO_S32_SAMPLES;
+		n = MIN(n, nmax);
+		nmax = audio_stream_bytes_without_wrap(sink, dst) >> BYTES_TO_U8_SAMPLES;
+		n = MIN(n, nmax);
+		for (i = 0; i < n; i++) {
+			*dst = sat_int8(Q_SHIFT_RND(*src, 24, 0)) - INT8_MIN;
+			src++;
+			dst++;
+		}
+	}
+
+	return samples;
+}
+#endif /* CONFIG_PCM_CONVERTER_FORMAT_U8 && CONFIG_PCM_CONVERTER_FORMAT_S32LE */
+
 #if CONFIG_PCM_CONVERTER_FORMAT_S16LE && CONFIG_PCM_CONVERTER_FORMAT_S24LE
 
 static int pcm_convert_s16_to_s24(const struct audio_stream *source,
@@ -555,6 +615,13 @@ const struct pcm_func_map pcm_func_map[] = {
 	{ SOF_IPC_FRAME_U8, SOF_IPC_FRAME_S32_LE, pcm_convert_u8_to_s32 },
 	{ SOF_IPC_FRAME_S32_LE, SOF_IPC_FRAME_U8, pcm_convert_s32_to_u8 },
 #endif /* CONFIG_PCM_CONVERTER_FORMAT_U8 && CONFIG_PCM_CONVERTER_FORMAT_S32LE */
+#if CONFIG_PCM_CONVERTER_FORMAT_A_LAW
+	{ SOF_IPC_FRAME_A_LAW, SOF_IPC_FRAME_A_LAW, just_copy },
+#endif /* CONFIG_PCM_CONVERTER_FORMAT_A_LAW */
+#if CONFIG_PCM_CONVERTER_FORMAT_A_LAW && CONFIG_PCM_CONVERTER_FORMAT_S32LE
+	{ SOF_IPC_FRAME_A_LAW, SOF_IPC_FRAME_S32_LE, pcm_convert_alaw_to_s32 },
+	{ SOF_IPC_FRAME_S32_LE, SOF_IPC_FRAME_A_LAW, pcm_convert_s32_to_alaw },
+#endif /* CONFIG_PCM_CONVERTER_FORMAT_A_LAW && CONFIG_PCM_CONVERTER_FORMAT_S32LE */
 #if CONFIG_PCM_CONVERTER_FORMAT_S16LE
 	{ SOF_IPC_FRAME_S16_LE, SOF_IPC_FRAME_S16_LE, just_copy },
 #endif /* CONFIG_PCM_CONVERTER_FORMAT_S16LE */

src/include/module/ipc/stream.h

@@ -22,7 +22,8 @@ enum sof_ipc_frame {
 	SOF_IPC_FRAME_S24_3LE,
 	SOF_IPC_FRAME_S24_4LE_MSB,
 	SOF_IPC_FRAME_U8,
-	SOF_IPC_FRAME_S16_4LE		/* 16-bit in 32-bit container */
+	SOF_IPC_FRAME_S16_4LE,		/* 16-bit in 32-bit container */
+	SOF_IPC_FRAME_A_LAW,
 };
 
 #endif /* __MODULE_IPC_STREAM_H__ */

src/include/module/ipc4/base-config.h

@@ -97,7 +97,9 @@ enum ipc4_sample_type {
 	IPC4_TYPE_LSB_INTEGER = 1,	/**< integer with Least Significant Byte first */
 	IPC4_TYPE_SIGNED_INTEGER = 2,
 	IPC4_TYPE_UNSIGNED_INTEGER = 3,
-	IPC4_TYPE_FLOAT = 4
+	IPC4_TYPE_FLOAT = 4,
+	IPC4_TYPE_A_LAW = 5,
+	IPC4_TYPE_MU_LAW = 6,
 };
 
 enum ipc4_stream_type {