1 files changed, 241 insertions, 0 deletions
diff --git a/src/encoder/wave_encoder.c b/src/encoder/wave_encoder.c
new file mode 100644
index 00000000..f06dea30
--- /dev/null
+++ b/src/encoder/wave_encoder.c
@@ -0,0 +1,241 @@
+/*
+ * Copyright (C) 2003-2009 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "encoder_api.h"
+#include "encoder_plugin.h"
+
+#include <assert.h>
+#include <string.h>
+
+#define MAX_BUFFER 32768
+
+struct wave_encoder {
+	struct encoder encoder;
+	unsigned bits;
+
+	uint8_t buffer[MAX_BUFFER];
+	size_t buffer_length;
+};
+
+struct wave_header {
+	uint32_t id_riff;
+	uint32_t riff_size;
+	uint32_t id_wave;
+	uint32_t id_fmt;
+	uint32_t fmt_size;
+	uint16_t format;
+	uint16_t channels;
+	uint32_t freq;
+	uint32_t byterate;
+	uint16_t blocksize;
+	uint16_t bits;
+	uint32_t id_data;
+	uint32_t data_size;
+};
+
+extern const struct encoder_plugin wave_encoder_plugin;
+
+static inline GQuark
+wave_encoder_quark(void)
+{
+	return g_quark_from_static_string("wave_encoder");
+}
+
+static void
+fill_wave_header(struct wave_header *header, int channels, int bits, 
+		int freq, int block_size)
+{
+	int data_size = 0x0FFFFFFF;
+
+	/* constants */
+	header->id_riff = GUINT32_TO_LE(0x46464952);
+	header->id_wave = GUINT32_TO_LE(0x45564157);
+	header->id_fmt = GUINT32_TO_LE(0x20746d66);
+	header->id_data = GUINT32_TO_LE(0x61746164);
+
+        /* wave format */
+	header->format = GUINT16_TO_LE(1);		// PCM_FORMAT
+	header->channels = GUINT16_TO_LE(channels);
+	header->bits = GUINT16_TO_LE(bits);
+	header->freq = GUINT32_TO_LE(freq);
+	header->blocksize = GUINT16_TO_LE(block_size);
+	header->byterate = GUINT32_TO_LE(freq * block_size);
+
+        /* chunk sizes (fake data length) */
+	header->fmt_size = GUINT32_TO_LE(16);
+	header->data_size = GUINT32_TO_LE(data_size);
+	header->riff_size = GUINT32_TO_LE(4 + (8 + 16) +
+					 (8 + data_size));
+}
+
+static struct encoder *
+wave_encoder_init(G_GNUC_UNUSED const struct config_param *param,
+		  G_GNUC_UNUSED GError **error)
+{
+	struct wave_encoder *encoder;
+
+	encoder = g_new(struct wave_encoder, 1);
+	encoder_struct_init(&encoder->encoder, &wave_encoder_plugin);
+
+	return &encoder->encoder;
+}
+
+static void
+wave_encoder_finish(struct encoder *_encoder)
+{
+	struct wave_encoder *encoder = (struct wave_encoder *)_encoder;
+
+	g_free(encoder);
+}
+
+static bool
+wave_encoder_open(struct encoder *_encoder,
+		  G_GNUC_UNUSED struct audio_format *audio_format,
+		  G_GNUC_UNUSED GError **error)
+{
+	struct wave_encoder *encoder = (struct wave_encoder *)_encoder;
+
+	encoder->bits = audio_format->bits;
+
+	/* create PCM wave header in initial buffer */
+	fill_wave_header((struct wave_header *) encoder->buffer, 
+			audio_format->channels,
+			audio_format->bits,
+			audio_format->sample_rate,
+			(audio_format->bits / 8) * audio_format->channels );
+
+	encoder->buffer_length = sizeof(struct wave_header);
+	return true;
+}
+
+static inline size_t
+pcm16_to_wave(void *dst, const void *src, size_t length)
+{
+	uint32_t scnt;
+	const uint16_t *src16 = (const uint16_t *) src;
+	uint16_t *dst16 = (uint16_t *) dst;
+
+	for(scnt = length >> 1; scnt>0; scnt--){
+		*dst16++ = GUINT16_TO_LE(*src16++);
+	}
+	return length;
+}
+
+static inline size_t
+pcm32_to_wave(void *dst, const void *src, size_t length)
+{
+	uint32_t scnt;
+	const uint32_t *src32 = (const uint32_t *) src;
+	uint32_t *dst32 = (uint32_t *) dst;
+
+	for(scnt = length >> 2; scnt>0; scnt--){
+		*dst32++ = GUINT32_TO_LE(*src32++);
+	}
+	return length;
+}
+
+static inline size_t
+pcm24_to_wave(void *dst, const void *src, size_t length)
+{
+	uint32_t scnt, value;
+	const uint32_t *src32 = (const uint32_t *) src;
+	uint8_t *dst8  = (uint8_t *) dst;
+
+	for(scnt = length >> 2; scnt>0; scnt--){
+		value = *src32++;
+		*dst8++ = (value) & 0xFF;
+		*dst8++ = (value >> 8) & 0xFF;
+		*dst8++ = (value >> 16) & 0xFF;
+	}
+	//correct buffer length
+	length = dst8 - ((uint8_t *)dst);
+	return length;
+}
+
+static bool
+wave_encoder_write(struct encoder *_encoder,
+		   const void *src, size_t length,
+		   G_GNUC_UNUSED GError **error)
+{
+	struct wave_encoder *encoder = (struct wave_encoder *)_encoder;
+	void *dst;
+
+	assert(length + encoder->buffer_length < MAX_BUFFER);
+
+	dst = encoder->buffer + encoder->buffer_length;
+
+#if (G_BYTE_ORDER == G_LITTLE_ENDIAN)
+	switch (encoder->bits) {
+	case 8:
+	case 16:
+	case 32:// optimized cases
+		memcpy(dst, src, length);
+		break;
+	case 24:
+		length = pcm24_to_wave(dst, src, length);
+		break;
+	}
+#elif (G_BYTE_ORDER == G_BIG_ENDIAN)
+	switch (encoder->bits) {
+	case 8:
+		memcpy(dst, src, length);
+		break;
+	case 16:
+		length = pcm16_to_wave(dst, src, length);
+		break;
+	case 24:
+		length = pcm24_to_wave(dst, src, length);
+		break;
+	case 32:
+		length = pcm32_to_wave(dst, src, length);
+		break;
+	}
+#else
+#error G_BYTE_ORDER set to G_PDP_ENDIAN is not supported by wave_encoder
+#endif
+
+	encoder->buffer_length += length;
+	return true;
+}
+
+static size_t
+wave_encoder_read(struct encoder *_encoder, void *dest, size_t length)
+{
+	struct wave_encoder *encoder = (struct wave_encoder *)_encoder;
+
+	if (length > encoder->buffer_length)
+		length = encoder->buffer_length;
+
+	memcpy(dest, encoder->buffer, length);
+
+	encoder->buffer_length -= length;
+	memmove(encoder->buffer, encoder->buffer + length,
+		encoder->buffer_length);
+
+	return length;
+}
+
+const struct encoder_plugin wave_encoder_plugin = {
+	.name = "wave",
+	.init = wave_encoder_init,
+	.finish = wave_encoder_finish,
+	.open = wave_encoder_open,
+	.write = wave_encoder_write,
+	.read = wave_encoder_read,
+};