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authorMax Kellermann <max@duempel.org>2009-08-26 20:08:13 +0200
committerMax Kellermann <max@duempel.org>2009-08-26 20:08:13 +0200
commitbff4c54ece5d6ebf84c1a19a05afbeba57bf65ae (patch)
tree31faabe85d032cf3e5d21f54fdbb8469e3ab6e46 /src/decoder
parentdf0c26a394be7dd4137c9614dd867122019d78f8 (diff)
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decoder/mpg123: new decoder plugin based on libmpg123
Still missing: - seeking - tags - streaming - encodings other than MPG123_ENC_SIGNED_16
Diffstat (limited to 'src/decoder')
-rw-r--r--src/decoder/mpg123_decoder_plugin.c210
1 files changed, 210 insertions, 0 deletions
diff --git a/src/decoder/mpg123_decoder_plugin.c b/src/decoder/mpg123_decoder_plugin.c
new file mode 100644
index 000000000..7ffeb1155
--- /dev/null
+++ b/src/decoder/mpg123_decoder_plugin.c
@@ -0,0 +1,210 @@
+/*
+ * 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 "decoder_api.h"
+
+#include <glib.h>
+
+#include <mpg123.h>
+
+#undef G_LOG_DOMAIN
+#define G_LOG_DOMAIN "mpg123"
+
+static bool
+mpd_mpg123_init(G_GNUC_UNUSED const struct config_param *param)
+{
+ mpg123_init();
+
+ return true;
+}
+
+static void
+mpd_mpg123_finish(void)
+{
+ mpg123_exit();
+}
+
+/**
+ * Opens a file with an existing #mpg123_handle.
+ *
+ * @param handle a handle which was created before; on error, this
+ * function will not free it
+ * @param audio_format this parameter is filled after successful
+ * return
+ * @return true on success
+ */
+static bool
+mpd_mpg123_open(mpg123_handle *handle, const char *path_fs,
+ struct audio_format *audio_format)
+{
+ char *path_dup;
+ int error;
+ int channels, encoding;
+ long rate;
+
+ /* mpg123_open() wants a writable string :-( */
+ path_dup = g_strdup(path_fs);
+
+ error = mpg123_open(handle, path_dup);
+ g_free(path_dup);
+ if (error != MPG123_OK) {
+ g_warning("libmpg123 failed to open %s: %s",
+ path_fs, mpg123_plain_strerror(error));
+ return false;
+ }
+
+ /* obtain the audio format */
+
+ error = mpg123_getformat(handle, &rate, &channels, &encoding);
+ if (error != MPG123_OK) {
+ g_warning("mpg123_getformat() failed: %s",
+ mpg123_plain_strerror(error));
+ return false;
+ }
+
+ if (encoding != MPG123_ENC_SIGNED_16) {
+ /* other formats not yet implemented */
+ g_warning("expected MPG123_ENC_SIGNED_16, got %d", encoding);
+ return false;
+ }
+
+ audio_format_init(audio_format, rate, 16, channels);
+ if (!audio_format_valid(audio_format)) {
+ g_warning("invalid audio format");
+ return false;
+ }
+
+ return true;
+}
+
+static void
+mpd_mpg123_file_decode(struct decoder *decoder, const char *path_fs)
+{
+ struct audio_format audio_format;
+ mpg123_handle *handle;
+ int error;
+ off_t num_samples, position;
+ enum decoder_command cmd;
+
+ /* open the file */
+
+ handle = mpg123_new(NULL, &error);
+ if (handle == NULL) {
+ g_warning("mpg123_new() failed: %s",
+ mpg123_plain_strerror(error));
+ return;
+ }
+
+ if (!mpd_mpg123_open(handle, path_fs, &audio_format)) {
+ mpg123_delete(handle);
+ return;
+ }
+
+ num_samples = mpg123_length(handle);
+
+ /* tell MPD core we're ready */
+
+ decoder_initialized(decoder, &audio_format, false,
+ (float)num_samples /
+ (float)audio_format.sample_rate);
+
+ /* the decoder main loop */
+
+ do {
+ unsigned char buffer[8192];
+ size_t nbytes;
+
+ position = mpg123_tell(handle);
+
+ /* decode */
+
+ error = mpg123_read(handle, buffer, sizeof(buffer), &nbytes);
+ if (error != MPG123_OK) {
+ if (error != MPG123_DONE)
+ g_warning("mpg123_read() failed: %s",
+ mpg123_plain_strerror(error));
+ break;
+ }
+
+ /* send to MPD */
+
+ cmd = decoder_data(decoder, NULL, buffer, nbytes,
+ (float)position /
+ (float)audio_format.sample_rate,
+ 0, NULL);
+
+ /* seeking not yet implemented */
+ } while (cmd == DECODE_COMMAND_NONE);
+
+ /* cleanup */
+
+ mpg123_delete(handle);
+}
+
+static struct tag *
+mpd_mpg123_tag_dup(const char *path_fs)
+{
+ struct audio_format audio_format;
+ mpg123_handle *handle;
+ int error;
+ off_t num_samples;
+ struct tag *tag;
+
+ handle = mpg123_new(NULL, &error);
+ if (handle == NULL) {
+ g_warning("mpg123_new() failed: %s",
+ mpg123_plain_strerror(error));
+ return NULL;
+ }
+
+ if (!mpd_mpg123_open(handle, path_fs, &audio_format)) {
+ mpg123_delete(handle);
+ return NULL;
+ }
+
+ num_samples = mpg123_length(handle);
+ if (num_samples <= 0) {
+ mpg123_delete(handle);
+ return NULL;
+ }
+
+ tag = tag_new();
+
+ tag->time = num_samples / audio_format.sample_rate;
+
+ /* ID3 tag support not yet implemented */
+
+ mpg123_delete(handle);
+ return tag;
+}
+
+static const char *const mpg123_suffixes[] = {
+ "mp3",
+ NULL
+};
+
+const struct decoder_plugin mpg123_decoder_plugin = {
+ .name = "mpg123",
+ .init = mpd_mpg123_init,
+ .finish = mpd_mpg123_finish,
+ .file_decode = mpd_mpg123_file_decode,
+ /* streaming not yet implemented */
+ .tag_dup = mpd_mpg123_tag_dup,
+ .suffixes = mpg123_suffixes,
+};