mpd/src/decoder_api.c

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/* the Music Player Daemon (MPD)
* Copyright (C) 2003-2007 by Warren Dukes (warren.dukes@gmail.com)
* Copyright (C) 2008 Max Kellermann <max@duempel.org>
* This project's homepage is: 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "decoder_internal.h"
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#include "decoder_control.h"
#include "player_control.h"
#include "audio.h"
#include "song.h"
#include "utils.h"
#include "normalize.h"
#include "pipe.h"
#include <glib.h>
#include <assert.h>
#include <stdlib.h>
void decoder_initialized(struct decoder * decoder,
const struct audio_format *audio_format,
bool seekable, float total_time)
{
assert(dc.state == DECODE_STATE_START);
assert(decoder != NULL);
assert(decoder->stream_tag == NULL);
assert(decoder->decoder_tag == NULL);
assert(!decoder->seeking);
assert(audio_format != NULL);
assert(audio_format_defined(audio_format));
assert(audio_format_valid(audio_format));
dc.in_audio_format = *audio_format;
getOutputAudioFormat(audio_format, &dc.out_audio_format);
dc.seekable = seekable;
dc.total_time = total_time;
dc.state = DECODE_STATE_DECODE;
notify_signal(&pc.notify);
}
char *decoder_get_uri(G_GNUC_UNUSED struct decoder *decoder)
{
return song_get_uri(dc.current_song);
}
enum decoder_command decoder_get_command(G_GNUC_UNUSED struct decoder * decoder)
{
return dc.command;
}
void decoder_command_finished(G_GNUC_UNUSED struct decoder * decoder)
{
assert(dc.command != DECODE_COMMAND_NONE);
assert(dc.command != DECODE_COMMAND_SEEK ||
dc.seek_error || decoder->seeking);
if (dc.command == DECODE_COMMAND_SEEK)
/* delete frames from the old song position */
music_pipe_clear();
dc.command = DECODE_COMMAND_NONE;
notify_signal(&pc.notify);
}
double decoder_seek_where(G_GNUC_UNUSED struct decoder * decoder)
{
assert(dc.command == DECODE_COMMAND_SEEK);
decoder->seeking = true;
return dc.seek_where;
}
void decoder_seek_error(struct decoder * decoder)
{
assert(dc.command == DECODE_COMMAND_SEEK);
dc.seek_error = true;
decoder_command_finished(decoder);
}
size_t decoder_read(struct decoder *decoder,
struct input_stream *is,
void *buffer, size_t length)
{
size_t nbytes;
assert(decoder == NULL ||
dc.state == DECODE_STATE_START ||
dc.state == DECODE_STATE_DECODE);
assert(is != NULL);
assert(buffer != NULL);
if (length == 0)
return 0;
while (true) {
/* XXX don't allow decoder==NULL */
if (decoder != NULL &&
/* ignore the SEEK command during initialization,
the plugin should handle that after it has
initialized successfully */
(dc.command != DECODE_COMMAND_SEEK ||
(dc.state != DECODE_STATE_START && !decoder->seeking)) &&
dc.command != DECODE_COMMAND_NONE)
return 0;
nbytes = input_stream_read(is, buffer, length);
if (nbytes > 0 || input_stream_eof(is))
return nbytes;
/* sleep for a fraction of a second! */
/* XXX don't sleep, wait for an event instead */
my_usleep(10000);
}
}
/**
* All chunks are full of decoded data; wait for the player to free
* one.
*/
static enum decoder_command
need_chunks(struct input_stream *is, bool wait)
{
if (dc.command == DECODE_COMMAND_STOP ||
dc.command == DECODE_COMMAND_SEEK)
return dc.command;
if ((is == NULL || input_stream_buffer(is) <= 0) && wait) {
notify_wait(&dc.notify);
notify_signal(&pc.notify);
return dc.command;
}
return DECODE_COMMAND_NONE;
}
static enum decoder_command
do_send_tag(struct input_stream *is, const struct tag *tag)
{
while (!music_pipe_tag(tag)) {
enum decoder_command cmd = need_chunks(is, true);
if (cmd != DECODE_COMMAND_NONE)
return cmd;
}
return DECODE_COMMAND_NONE;
}
static bool
update_stream_tag(struct decoder *decoder, struct input_stream *is)
{
struct tag *tag;
if (is == NULL)
return false;
tag = input_stream_tag(is);
if (tag == NULL)
return false;
if (decoder->stream_tag != NULL)
tag_free(decoder->stream_tag);
decoder->stream_tag = tag;
return true;
}
enum decoder_command
decoder_data(struct decoder *decoder,
struct input_stream *is,
void *_data, size_t length,
float data_time, uint16_t bitRate,
struct replay_gain_info *replay_gain_info)
{
static char *conv_buffer;
static size_t conv_buffer_size;
size_t nbytes;
char *data;
assert(dc.state == DECODE_STATE_DECODE);
if (dc.command == DECODE_COMMAND_STOP ||
dc.command == DECODE_COMMAND_SEEK ||
length == 0)
return dc.command;
/* send stream tags */
if (update_stream_tag(decoder, is)) {
enum decoder_command cmd;
if (decoder->decoder_tag != NULL) {
/* merge with tag from decoder plugin */
struct tag *tag;
tag = tag_merge(decoder->stream_tag,
decoder->decoder_tag);
cmd = do_send_tag(is, tag);
tag_free(tag);
} else
/* send only the stream tag */
cmd = do_send_tag(is, decoder->stream_tag);
if (cmd != DECODE_COMMAND_NONE)
return cmd;
}
if (audio_format_equals(&dc.in_audio_format, &dc.out_audio_format)) {
data = _data;
} else {
size_t out_length =
pcm_convert_size(&dc.in_audio_format, length,
&dc.out_audio_format);
if (out_length > conv_buffer_size) {
g_free(conv_buffer);
conv_buffer = g_malloc(out_length);
conv_buffer_size = out_length;
}
data = conv_buffer;
length = pcm_convert(&dc.in_audio_format, _data,
length, &dc.out_audio_format,
data, &decoder->conv_state);
/* under certain circumstances, pcm_convert() may
return an empty buffer - this condition should be
investigated further, but for now, do this check as
a workaround: */
if (length == 0)
return DECODE_COMMAND_NONE;
}
if (replay_gain_info != NULL && (replay_gain_mode != REPLAY_GAIN_OFF))
replay_gain_apply(replay_gain_info, data, length,
&dc.out_audio_format);
else if (normalizationEnabled)
normalizeData(data, length, &dc.out_audio_format);
while (length > 0) {
nbytes = music_pipe_append(data, length,
&dc.out_audio_format,
data_time, bitRate);
length -= nbytes;
data += nbytes;
if (length > 0) {
enum decoder_command cmd =
need_chunks(is, nbytes == 0);
if (cmd != DECODE_COMMAND_NONE)
return cmd;
}
}
return DECODE_COMMAND_NONE;
}
enum decoder_command
decoder_tag(G_GNUC_UNUSED struct decoder *decoder, struct input_stream *is,
const struct tag *tag)
{
enum decoder_command cmd;
assert(dc.state == DECODE_STATE_DECODE);
assert(tag != NULL);
/* save the tag */
if (decoder->decoder_tag != NULL)
tag_free(decoder->decoder_tag);
decoder->decoder_tag = tag_dup(tag);
/* check for a new stream tag */
update_stream_tag(decoder, is);
/* send tag to music pipe */
if (decoder->stream_tag != NULL) {
/* merge with tag from input stream */
struct tag *merged;
merged = tag_merge(decoder->stream_tag, decoder->decoder_tag);
cmd = do_send_tag(is, merged);
tag_free(merged);
} else
/* send only the decoder tag */
cmd = do_send_tag(is, tag);
return cmd;
}