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authorViliam Mateicka <viliam.mateicka@gmail.com>2009-11-17 19:41:35 +0100
committerViliam Mateicka <viliam.mateicka@gmail.com>2009-11-17 19:41:35 +0100
commit5420f9ae76babdfa4ecf35eaad44f90c5866e59a (patch)
tree7b70de8d9296faa953d6084e8cf97518a709259d /src/encoder/flac_encoder.c
parent39404725f05222706196c6faeaee841b999f9dfb (diff)
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encoder: introducing flac encoder plugin
Diffstat (limited to 'src/encoder/flac_encoder.c')
-rw-r--r--src/encoder/flac_encoder.c296
1 files changed, 296 insertions, 0 deletions
diff --git a/src/encoder/flac_encoder.c b/src/encoder/flac_encoder.c
new file mode 100644
index 000000000..ab7dc0c39
--- /dev/null
+++ b/src/encoder/flac_encoder.c
@@ -0,0 +1,296 @@
+/*
+ * 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 "config.h"
+#include "encoder_api.h"
+#include "encoder_plugin.h"
+#include "audio_format.h"
+#include "pcm_buffer.h"
+
+#include <assert.h>
+#include <string.h>
+
+#include <FLAC/stream_encoder.h>
+
+struct flac_encoder {
+ struct encoder encoder;
+
+ struct audio_format audio_format;
+ unsigned compression;
+
+ FLAC__StreamEncoder *fse;
+
+ struct pcm_buffer expand_buffer;
+
+ struct pcm_buffer buffer;
+ size_t buffer_length;
+};
+
+extern const struct encoder_plugin flac_encoder_plugin;
+
+static inline GQuark
+flac_encoder_quark(void)
+{
+ return g_quark_from_static_string("flac_encoder");
+}
+
+static bool
+flac_encoder_configure(struct flac_encoder *encoder,
+ const struct config_param *param, G_GNUC_UNUSED GError **error)
+{
+ encoder->compression = config_get_block_unsigned(param,
+ "compression", 5);
+
+ return true;
+}
+
+static struct encoder *
+flac_encoder_init(const struct config_param *param, GError **error)
+{
+ struct flac_encoder *encoder;
+
+ encoder = g_new(struct flac_encoder, 1);
+ encoder_struct_init(&encoder->encoder, &flac_encoder_plugin);
+
+ /* load configuration from "param" */
+ if (!flac_encoder_configure(encoder, param, error)) {
+ /* configuration has failed, roll back and return error */
+ g_free(encoder);
+ return NULL;
+ }
+
+ return &encoder->encoder;
+}
+
+static void
+flac_encoder_finish(struct encoder *_encoder)
+{
+ struct flac_encoder *encoder = (struct flac_encoder *)_encoder;
+
+ /* the real libFLAC cleanup was already performed by
+ flac_encoder_close(), so no real work here */
+ g_free(encoder);
+}
+
+static bool
+flac_encoder_setup(struct flac_encoder *encoder, GError **error)
+{
+ if ( !FLAC__stream_encoder_set_compression_level(encoder->fse,
+ encoder->compression)) {
+ g_set_error(error, flac_encoder_quark(), 0,
+ "error setting flac compression to %d",
+ encoder->compression);
+ return false;
+ }
+ if ( !FLAC__stream_encoder_set_channels(encoder->fse,
+ encoder->audio_format.channels)) {
+ g_set_error(error, flac_encoder_quark(), 0,
+ "error setting flac channels num to %d",
+ encoder->audio_format.channels);
+ return false;
+ }
+ if ( !FLAC__stream_encoder_set_bits_per_sample(encoder->fse,
+ encoder->audio_format.bits)) {
+ g_set_error(error, flac_encoder_quark(), 0,
+ "error setting flac bit format to %d",
+ encoder->audio_format.bits);
+ return false;
+ }
+ if ( !FLAC__stream_encoder_set_sample_rate(encoder->fse,
+ encoder->audio_format.sample_rate)) {
+ g_set_error(error, flac_encoder_quark(), 0,
+ "error setting flac sample rate to %d",
+ encoder->audio_format.sample_rate);
+ return false;
+ }
+ return true;
+}
+
+static FLAC__StreamEncoderWriteStatus
+flac_write_callback(G_GNUC_UNUSED const FLAC__StreamEncoder *fse,
+ const FLAC__byte data[], size_t bytes, G_GNUC_UNUSED unsigned samples,
+ G_GNUC_UNUSED unsigned current_frame, void *client_data)
+{
+ struct flac_encoder *encoder = (struct flac_encoder *) client_data;
+
+ char *buffer = pcm_buffer_get(&encoder->buffer, encoder->buffer_length + bytes);
+
+ //transfer data to buffer
+ memcpy( buffer + encoder->buffer_length, data, bytes);
+ encoder->buffer_length += bytes;
+
+ return FLAC__STREAM_ENCODER_WRITE_STATUS_OK;
+}
+
+static bool
+flac_encoder_open(struct encoder *_encoder, struct audio_format *audio_format,
+ GError **error)
+{
+ struct flac_encoder *encoder = (struct flac_encoder *)_encoder;
+ FLAC__StreamEncoderInitStatus init_status;
+
+ encoder->audio_format = *audio_format;
+
+ /* FIXME: flac should support 32bit as well */
+ if (audio_format->bits > 24)
+ audio_format->bits = 24;
+
+ /* allocate the encoder */
+ encoder->fse = FLAC__stream_encoder_new();
+ if (encoder->fse == NULL) {
+ g_set_error(error, flac_encoder_quark(), 0,
+ "flac_new() failed");
+ return false;
+ }
+
+ if (!flac_encoder_setup(encoder, error)) {
+ FLAC__stream_encoder_delete(encoder->fse);
+ return false;
+ }
+
+ encoder->buffer_length = 0;
+ pcm_buffer_init(&encoder->buffer);
+ pcm_buffer_init(&encoder->expand_buffer);
+
+ /* this immediatelly outputs data throught callback */
+
+ init_status = FLAC__stream_encoder_init_stream(encoder->fse,
+ flac_write_callback,
+ NULL, NULL, NULL, encoder);
+
+ if(init_status != FLAC__STREAM_ENCODER_INIT_STATUS_OK) {
+ g_set_error(error, flac_encoder_quark(), 0,
+ "failed to initialize encoder: %s\n",
+ FLAC__StreamEncoderInitStatusString[init_status]);
+ FLAC__stream_encoder_delete(encoder->fse);
+ return false;
+ }
+
+ return true;
+}
+
+static void
+flac_encoder_close(struct encoder *_encoder)
+{
+ struct flac_encoder *encoder = (struct flac_encoder *)_encoder;
+
+ FLAC__stream_encoder_delete(encoder->fse);
+
+ pcm_buffer_deinit(&encoder->buffer);
+ pcm_buffer_deinit(&encoder->expand_buffer);
+}
+
+static bool
+flac_encoder_flush(struct encoder *_encoder, G_GNUC_UNUSED GError **error)
+{
+ struct flac_encoder *encoder = (struct flac_encoder *)_encoder;
+
+ return FLAC__stream_encoder_finish(encoder->fse);
+}
+
+static inline void
+pcm8_to_flac(int32_t *out, const int8_t *in, unsigned num_samples)
+{
+ while (num_samples > 0) {
+ *out++ = *in++;
+ --num_samples;
+ }
+}
+
+static inline void
+pcm16_to_flac(int32_t *out, const int16_t *in, unsigned num_samples)
+{
+ while (num_samples > 0) {
+ *out++ = *in++;
+ --num_samples;
+ }
+}
+
+static bool
+flac_encoder_write(struct encoder *_encoder,
+ const void *data, size_t length,
+ G_GNUC_UNUSED GError **error)
+{
+ struct flac_encoder *encoder = (struct flac_encoder *)_encoder;
+ unsigned num_frames, num_samples;
+ void *exbuffer;
+ const void *buffer = NULL;
+
+ /* format conversion */
+
+ num_frames = length / audio_format_frame_size(&encoder->audio_format);
+ num_samples = num_frames * encoder->audio_format.channels;
+
+ switch (encoder->audio_format.bits) {
+ case 8:
+ exbuffer = pcm_buffer_get(&encoder->expand_buffer, length*4);
+ pcm8_to_flac(exbuffer, data, num_samples);
+ buffer = exbuffer;
+ break;
+ case 16:
+ exbuffer = pcm_buffer_get(&encoder->expand_buffer, length*2);
+ pcm16_to_flac(exbuffer, data, num_samples);
+ buffer = exbuffer;
+ break;
+ case 24:
+ case 32: /* nothing need to be done
+ * format is the same for both mpd and libFLAC */
+ buffer = data;
+ break;
+ }
+
+ /* feed samples to encoder */
+
+ if (!FLAC__stream_encoder_process_interleaved(encoder->fse, buffer,
+ num_frames)) {
+ g_set_error(error, flac_encoder_quark(), 0,
+ "flac encoder process failed");
+ return false;
+ }
+
+ return true;
+}
+
+static size_t
+flac_encoder_read(struct encoder *_encoder, void *dest, size_t length)
+{
+ struct flac_encoder *encoder = (struct flac_encoder *)_encoder;
+ char *buffer = pcm_buffer_get(&encoder->buffer, encoder->buffer_length);
+
+ if (length > encoder->buffer_length)
+ length = encoder->buffer_length;
+
+ memcpy(dest, buffer, length);
+
+ encoder->buffer_length -= length;
+ memmove(buffer, buffer + length, encoder->buffer_length);
+
+ return length;
+}
+
+const struct encoder_plugin flac_encoder_plugin = {
+ .name = "flac",
+ .init = flac_encoder_init,
+ .finish = flac_encoder_finish,
+ .open = flac_encoder_open,
+ .close = flac_encoder_close,
+ .flush = flac_encoder_flush,
+ .write = flac_encoder_write,
+ .read = flac_encoder_read,
+};