mpd/src/DecoderAPI.cxx

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/*
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* Copyright (C) 2003-2013 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"
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#include "decoder_api.h"
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#include "AudioConfig.hxx"
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#include "replay_gain_config.h"
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#include "MusicChunk.hxx"
#include "MusicBuffer.hxx"
#include "MusicPipe.hxx"
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#include "DecoderControl.hxx"
#include "DecoderInternal.hxx"
#include "song.h"
#include "InputStream.hxx"
#include <glib.h>
#include <assert.h>
#include <stdlib.h>
#undef G_LOG_DOMAIN
#define G_LOG_DOMAIN "decoder"
void
decoder_initialized(struct decoder *decoder,
const struct audio_format *audio_format,
bool seekable, float total_time)
{
struct decoder_control *dc = decoder->dc;
struct audio_format_string af_string;
assert(dc->state == DECODE_STATE_START);
assert(dc->pipe != NULL);
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->Lock();
dc->state = DECODE_STATE_DECODE;
dc->client_cond.signal();
dc->Unlock();
g_debug("audio_format=%s, seekable=%s",
audio_format_to_string(&dc->in_audio_format, &af_string),
seekable ? "true" : "false");
if (!audio_format_equals(&dc->in_audio_format,
&dc->out_audio_format))
g_debug("converting to %s",
audio_format_to_string(&dc->out_audio_format,
&af_string));
}
/**
* Checks if we need an "initial seek". If so, then the initial seek
* is prepared, and the function returns true.
*/
G_GNUC_PURE
static bool
decoder_prepare_initial_seek(struct decoder *decoder)
{
const struct decoder_control *dc = decoder->dc;
assert(dc->pipe != NULL);
if (dc->state != DECODE_STATE_DECODE)
/* wait until the decoder has finished initialisation
(reading file headers etc.) before emitting the
virtual "SEEK" command */
return false;
if (decoder->initial_seek_running)
/* initial seek has already begun - override any other
command */
return true;
if (decoder->initial_seek_pending) {
if (!dc->seekable) {
/* seeking is not possible */
decoder->initial_seek_pending = false;
return false;
}
if (dc->command == DECODE_COMMAND_NONE) {
/* begin initial seek */
decoder->initial_seek_pending = false;
decoder->initial_seek_running = true;
return true;
}
/* skip initial seek when there's another command
(e.g. STOP) */
decoder->initial_seek_pending = false;
}
return false;
}
/**
* Returns the current decoder command. May return a "virtual"
* synthesized command, e.g. to seek to the beginning of the CUE
* track.
*/
G_GNUC_PURE
static enum decoder_command
decoder_get_virtual_command(struct decoder *decoder)
{
const struct decoder_control *dc = decoder->dc;
assert(dc->pipe != NULL);
if (decoder_prepare_initial_seek(decoder))
return DECODE_COMMAND_SEEK;
return dc->command;
}
enum decoder_command
decoder_get_command(struct decoder *decoder)
{
return decoder_get_virtual_command(decoder);
}
void
decoder_command_finished(struct decoder *decoder)
{
struct decoder_control *dc = decoder->dc;
dc->Lock();
assert(dc->command != DECODE_COMMAND_NONE ||
decoder->initial_seek_running);
assert(dc->command != DECODE_COMMAND_SEEK ||
decoder->initial_seek_running ||
dc->seek_error || decoder->seeking);
assert(dc->pipe != NULL);
if (decoder->initial_seek_running) {
assert(!decoder->seeking);
assert(decoder->chunk == NULL);
assert(music_pipe_empty(dc->pipe));
decoder->initial_seek_running = false;
decoder->timestamp = dc->start_ms / 1000.;
dc->Unlock();
return;
}
if (decoder->seeking) {
decoder->seeking = false;
/* delete frames from the old song position */
if (decoder->chunk != NULL) {
music_buffer_return(dc->buffer, decoder->chunk);
decoder->chunk = NULL;
}
music_pipe_clear(dc->pipe, dc->buffer);
decoder->timestamp = dc->seek_where;
}
dc->command = DECODE_COMMAND_NONE;
dc->client_cond.signal();
dc->Unlock();
}
double decoder_seek_where(G_GNUC_UNUSED struct decoder * decoder)
{
const struct decoder_control *dc = decoder->dc;
assert(dc->pipe != NULL);
if (decoder->initial_seek_running)
return dc->start_ms / 1000.;
assert(dc->command == DECODE_COMMAND_SEEK);
decoder->seeking = true;
return dc->seek_where;
}
void decoder_seek_error(struct decoder * decoder)
{
struct decoder_control *dc = decoder->dc;
assert(dc->pipe != NULL);
if (decoder->initial_seek_running) {
/* d'oh, we can't seek to the sub-song start position,
what now? - no idea, ignoring the problem for now. */
decoder->initial_seek_running = false;
return;
}
assert(dc->command == DECODE_COMMAND_SEEK);
dc->seek_error = true;
decoder->seeking = false;
decoder_command_finished(decoder);
}
/**
* Should be read operation be cancelled? That is the case when the
* player thread has sent a command such as "STOP".
*/
G_GNUC_PURE
static inline bool
decoder_check_cancel_read(const struct decoder *decoder)
{
if (decoder == NULL)
return false;
const struct decoder_control *dc = decoder->dc;
if (dc->command == DECODE_COMMAND_NONE)
return false;
/* ignore the SEEK command during initialization, the plugin
should handle that after it has initialized successfully */
if (dc->command == DECODE_COMMAND_SEEK &&
(dc->state == DECODE_STATE_START || decoder->seeking))
return false;
return true;
}
size_t decoder_read(struct decoder *decoder,
struct input_stream *is,
void *buffer, size_t length)
{
/* XXX don't allow decoder==NULL */
GError *error = NULL;
size_t nbytes;
assert(decoder == NULL ||
decoder->dc->state == DECODE_STATE_START ||
decoder->dc->state == DECODE_STATE_DECODE);
assert(is != NULL);
assert(buffer != NULL);
if (length == 0)
return 0;
input_stream_lock(is);
while (true) {
if (decoder_check_cancel_read(decoder)) {
input_stream_unlock(is);
return 0;
}
if (input_stream_available(is))
break;
is->cond.wait(is->mutex);
}
nbytes = input_stream_read(is, buffer, length, &error);
assert(nbytes == 0 || error == NULL);
assert(nbytes > 0 || error != NULL || input_stream_eof(is));
if (G_UNLIKELY(nbytes == 0 && error != NULL)) {
g_warning("%s", error->message);
g_error_free(error);
}
input_stream_unlock(is);
return nbytes;
}
void
decoder_timestamp(struct decoder *decoder, double t)
{
assert(decoder != NULL);
assert(t >= 0);
decoder->timestamp = t;
}
/**
* Sends a #tag as-is to the music pipe. Flushes the current chunk
* (decoder.chunk) if there is one.
*/
static enum decoder_command
do_send_tag(struct decoder *decoder, const struct tag *tag)
{
struct music_chunk *chunk;
if (decoder->chunk != NULL) {
/* there is a partial chunk - flush it, we want the
tag in a new chunk */
decoder_flush_chunk(decoder);
decoder->dc->client_cond.signal();
}
assert(decoder->chunk == NULL);
chunk = decoder_get_chunk(decoder);
if (chunk == NULL) {
assert(decoder->dc->command != DECODE_COMMAND_NONE);
return decoder->dc->command;
}
chunk->tag = tag_dup(tag);
return DECODE_COMMAND_NONE;
}
static bool
update_stream_tag(struct decoder *decoder, struct input_stream *is)
{
struct tag *tag;
tag = is != NULL
? input_stream_lock_tag(is)
: NULL;
if (tag == NULL) {
tag = decoder->song_tag;
if (tag == NULL)
return false;
/* no stream tag present - submit the song tag
instead */
decoder->song_tag = NULL;
}
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,
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const void *data, size_t length,
uint16_t kbit_rate)
{
struct decoder_control *dc = decoder->dc;
GError *error = NULL;
enum decoder_command cmd;
assert(dc->state == DECODE_STATE_DECODE);
assert(dc->pipe != NULL);
assert(length % audio_format_frame_size(&dc->in_audio_format) == 0);
dc->Lock();
cmd = decoder_get_virtual_command(decoder);
dc->Unlock();
if (cmd == DECODE_COMMAND_STOP || cmd == DECODE_COMMAND_SEEK ||
length == 0)
return cmd;
/* send stream tags */
if (update_stream_tag(decoder, is)) {
if (decoder->decoder_tag != NULL) {
/* merge with tag from decoder plugin */
struct tag *tag;
tag = tag_merge(decoder->decoder_tag,
decoder->stream_tag);
cmd = do_send_tag(decoder, tag);
tag_free(tag);
} else
/* send only the stream tag */
cmd = do_send_tag(decoder, decoder->stream_tag);
if (cmd != DECODE_COMMAND_NONE)
return cmd;
}
if (!audio_format_equals(&dc->in_audio_format, &dc->out_audio_format)) {
data = pcm_convert(&decoder->conv_state,
&dc->in_audio_format, data, length,
&dc->out_audio_format, &length,
&error);
if (data == NULL) {
/* the PCM conversion has failed - stop
playback, since we have no better way to
bail out */
g_warning("%s", error->message);
return DECODE_COMMAND_STOP;
}
}
while (length > 0) {
struct music_chunk *chunk;
size_t nbytes;
bool full;
chunk = decoder_get_chunk(decoder);
if (chunk == NULL) {
assert(dc->command != DECODE_COMMAND_NONE);
return dc->command;
}
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void *dest = chunk->Write(dc->out_audio_format,
decoder->timestamp -
dc->song->start_ms / 1000.0,
kbit_rate, &nbytes);
if (dest == NULL) {
/* the chunk is full, flush it */
decoder_flush_chunk(decoder);
dc->client_cond.signal();
continue;
}
assert(nbytes > 0);
if (nbytes > length)
nbytes = length;
/* copy the buffer */
memcpy(dest, data, nbytes);
/* expand the music pipe chunk */
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full = chunk->Expand(dc->out_audio_format, nbytes);
if (full) {
/* the chunk is full, flush it */
decoder_flush_chunk(decoder);
dc->client_cond.signal();
}
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data = (const uint8_t *)data + nbytes;
length -= nbytes;
decoder->timestamp += (double)nbytes /
audio_format_time_to_size(&dc->out_audio_format);
if (dc->end_ms > 0 &&
decoder->timestamp >= dc->end_ms / 1000.0)
/* the end of this range has been reached:
stop decoding */
return DECODE_COMMAND_STOP;
}
return DECODE_COMMAND_NONE;
}
enum decoder_command
decoder_tag(G_GNUC_UNUSED struct decoder *decoder, struct input_stream *is,
const struct tag *tag)
{
G_GNUC_UNUSED const struct decoder_control *dc = decoder->dc;
enum decoder_command cmd;
assert(dc->state == DECODE_STATE_DECODE);
assert(dc->pipe != NULL);
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);
/* check if we're seeking */
if (decoder_prepare_initial_seek(decoder))
/* during initial seek, no music chunk must be created
until seeking is finished; skip the rest of the
function here */
return DECODE_COMMAND_SEEK;
/* 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(decoder, merged);
tag_free(merged);
} else
/* send only the decoder tag */
cmd = do_send_tag(decoder, tag);
return cmd;
}
void
decoder_replay_gain(struct decoder *decoder,
const struct replay_gain_info *replay_gain_info)
{
assert(decoder != NULL);
if (replay_gain_info != NULL) {
static unsigned serial;
if (++serial == 0)
serial = 1;
if (REPLAY_GAIN_OFF != replay_gain_mode) {
enum replay_gain_mode rgm = replay_gain_mode;
if (rgm != REPLAY_GAIN_ALBUM)
rgm = REPLAY_GAIN_TRACK;
decoder->dc->replay_gain_db = 20.0 * log10f(
replay_gain_tuple_scale(
&replay_gain_info->tuples[rgm],
replay_gain_preamp, replay_gain_missing_preamp,
replay_gain_limit));
}
decoder->replay_gain_info = *replay_gain_info;
decoder->replay_gain_serial = serial;
if (decoder->chunk != NULL) {
/* flush the current chunk because the new
replay gain values affect the following
samples */
decoder_flush_chunk(decoder);
decoder->dc->client_cond.signal();
}
} else
decoder->replay_gain_serial = 0;
}
void
decoder_mixramp(struct decoder *decoder,
char *mixramp_start, char *mixramp_end)
{
assert(decoder != NULL);
struct decoder_control *dc = decoder->dc;
assert(dc != NULL);
dc->MixRampStart(mixramp_start);
dc->MixRampEnd(mixramp_end);
}