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authorMax Kellermann <max@duempel.org>2009-11-11 06:45:23 +0100
committerMax Kellermann <max@duempel.org>2009-11-11 06:45:23 +0100
commit7c0c8ca8d790eba95eba4138074897e4ceca99df (patch)
tree2f37dc823a6a154e856a846341e0edf1ec3d18bc /src/encoder/wave_encoder.c
parent884be8e2b33c4ae536ee72ed1783aacdfe35bd6b (diff)
parent79035d7ed97b702cf33a91c460fc379d6133d6f6 (diff)
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Merge branch 'master' of git://git.musicpd.org/metyl/mpd
Diffstat (limited to '')
-rw-r--r--src/encoder/wave_encoder.c241
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 000000000..f06dea307
--- /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,
+};