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/*
* Copyright (C) 2003-2011 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" /* must be first for large file support */
#include "decoder_api.h"
#include "audio_check.h"
#include "tag_handler.h"
#include <glib.h>
#include <mpg123.h>
#include <stdio.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)
{
GError *gerror = NULL;
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;
}
if (!audio_format_init_checked(audio_format, rate, SAMPLE_FORMAT_S16,
channels, &gerror)) {
g_warning("%s", gerror->message);
g_error_free(gerror);
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;
enum decoder_command cmd;
struct mpg123_frameinfo info;
/* 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, true,
(float)num_samples /
(float)audio_format.sample_rate);
if (mpg123_info(handle, &info) != MPG123_OK) {
info.vbr = MPG123_CBR;
info.bitrate = 0;
}
switch (info.vbr) {
case MPG123_ABR:
info.bitrate = info.abr_rate;
break;
case MPG123_CBR:
break;
default:
info.bitrate = 0;
}
/* the decoder main loop */
do {
unsigned char buffer[8192];
size_t nbytes;
/* 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;
}
/* update bitrate for ABR/VBR */
if (info.vbr != MPG123_CBR) {
/* FIXME: maybe skip, as too expensive? */
/* FIXME: maybe, (info.vbr == MPG123_VBR) ? */
if (mpg123_info (handle, &info) != MPG123_OK)
info.bitrate = 0;
}
/* send to MPD */
cmd = decoder_data(decoder, NULL, buffer, nbytes, info.bitrate);
if (cmd == DECODE_COMMAND_SEEK) {
off_t c = decoder_seek_where(decoder)*audio_format.sample_rate;
c = mpg123_seek(handle, c, SEEK_SET);
if (c < 0)
decoder_seek_error(decoder);
else {
decoder_command_finished(decoder);
decoder_timestamp(decoder, c/(double)audio_format.sample_rate);
}
cmd = DECODE_COMMAND_NONE;
}
} while (cmd == DECODE_COMMAND_NONE);
/* cleanup */
mpg123_delete(handle);
}
static bool
mpd_mpg123_scan_file(const char *path_fs,
const struct tag_handler *handler, void *handler_ctx)
{
struct audio_format audio_format;
mpg123_handle *handle;
int error;
off_t num_samples;
handle = mpg123_new(NULL, &error);
if (handle == NULL) {
g_warning("mpg123_new() failed: %s",
mpg123_plain_strerror(error));
return false;
}
if (!mpd_mpg123_open(handle, path_fs, &audio_format)) {
mpg123_delete(handle);
return false;
}
num_samples = mpg123_length(handle);
if (num_samples <= 0) {
mpg123_delete(handle);
return false;
}
/* ID3 tag support not yet implemented */
mpg123_delete(handle);
tag_handler_invoke_duration(handler, handler_ctx,
num_samples / audio_format.sample_rate);
return true;
}
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 */
.scan_file = mpd_mpg123_scan_file,
.suffixes = mpg123_suffixes,
};
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