/**
* All chunks are full of decoded data; wait for the player to free
* one.
*/
static enum decoder_command
need_chunks(struct decoder_control *dc, struct input_stream *is, bool do_wait)
{
if (dc->command == DECODE_COMMAND_STOP ||
dc->command == DECODE_COMMAND_SEEK)
return dc->command;
if ((is == NULL || !decoder_input_buffer(dc, is)) && do_wait) {
decoder_wait(dc);
player_signal();
return dc->command;
}
return DECODE_COMMAND_NONE;
}
/**
* Opens the input stream with input_stream_open(), and waits until
* the stream gets ready. If a decoder STOP command is received
* during that, it cancels the operation (but does not close the
* stream).
*
* Unlock the decoder before calling this function.
*
* @return an input_stream on success or if #DECODE_COMMAND_STOP is
* received, NULL on error
*/
static struct input_stream *
decoder_input_stream_open(struct decoder_control *dc, const char *uri)
{
GError *error = NULL;
struct input_stream *is;
is = input_stream_open(uri, dc->mutex, dc->cond, &error);
if (is == NULL) {
if (error != NULL) {
g_warning("%s", error->message);
g_error_free(error);
}
return NULL;
}
/* wait for the input stream to become ready; its metadata
will be available then */
decoder_lock(dc);
input_stream_update(is);
while (!is->ready &&
dc->command != DECODE_COMMAND_STOP) {
decoder_wait(dc);
input_stream_update(is);
}
if (!input_stream_check(is, &error)) {
decoder_unlock(dc);
g_warning("%s", error->message);
g_error_free(error);
return NULL;
}
decoder_unlock(dc);
return is;
}
static gpointer
decoder_task(gpointer arg)
{
struct decoder_control *dc = arg;
decoder_lock(dc);
do {
assert(dc->state == DECODE_STATE_STOP ||
dc->state == DECODE_STATE_ERROR);
switch (dc->command) {
case DECODE_COMMAND_START:
g_debug("clearing mixramp tags");
dc_mixramp_start(dc, NULL);
dc_mixramp_prev_end(dc, dc->mixramp_end);
dc->mixramp_end = NULL; /* Don't free, it's copied above. */
dc->replay_gain_prev_db = dc->replay_gain_db;
dc->replay_gain_db = 0;
/* fall through */
case DECODE_COMMAND_SEEK:
decoder_run(dc);
break;
case DECODE_COMMAND_STOP:
decoder_command_finished_locked(dc);
break;
case DECODE_COMMAND_NONE:
decoder_wait(dc);
break;
}
} while (dc->command != DECODE_COMMAND_NONE || !dc->quit);
decoder_unlock(dc);
return NULL;
}
static void
decoder_run_song(struct decoder_control *dc,
const struct song *song, const char *uri)
{
struct decoder decoder = {
.dc = dc,
.initial_seek_pending = dc->start_ms > 0,
.initial_seek_running = false,
};
int ret;
decoder.timestamp = 0.0;
decoder.seeking = false;
decoder.song_tag = song->tag != NULL && song_is_file(song)
? tag_dup(song->tag) : NULL;
decoder.stream_tag = NULL;
decoder.decoder_tag = NULL;
decoder.chunk = NULL;
dc->state = DECODE_STATE_START;
decoder_command_finished_locked(dc);
pcm_convert_init(&decoder.conv_state);
ret = song_is_file(song)
? decoder_run_file(&decoder, uri)
: decoder_run_stream(&decoder, uri);
decoder_unlock(dc);
pcm_convert_deinit(&decoder.conv_state);
/* flush the last chunk */
if (decoder.chunk != NULL)
decoder_flush_chunk(&decoder);
if (decoder.song_tag != NULL)
tag_free(decoder.song_tag);
if (decoder.stream_tag != NULL)
tag_free(decoder.stream_tag);
if (decoder.decoder_tag != NULL)
tag_free(decoder.decoder_tag);
decoder_lock(dc);
dc->state = ret ? DECODE_STATE_STOP : DECODE_STATE_ERROR;
}
static void
decoder_run(struct decoder_control *dc)
{
const struct song *song = dc->song;
char *uri;
assert(song != NULL);
if (song_is_file(song))
uri = map_song_fs(song);
else
uri = song_get_uri(song);
if (uri == NULL) {
dc->state = DECODE_STATE_ERROR;
decoder_command_finished_locked(dc);
return;
}
decoder_run_song(dc, song, uri);
g_free(uri);
}
static gpointer
decoder_task(gpointer arg)
{
struct decoder_control *dc = arg;
decoder_lock(dc);
do {
assert(dc->state == DECODE_STATE_STOP ||
dc->state == DECODE_STATE_ERROR);
switch (dc->command) {
case DECODE_COMMAND_START:
dc_mixramp_start(dc, NULL);
dc_mixramp_prev_end(dc, dc->mixramp_end);
dc->mixramp_end = NULL; /* Don't free, it's copied above. */
dc->replay_gain_prev_db = dc->replay_gain_db;
dc->replay_gain_db = 0;
/* fall through */
case DECODE_COMMAND_SEEK:
decoder_run(dc);
break;
case DECODE_COMMAND_STOP:
decoder_command_finished_locked(dc);
break;
case DECODE_COMMAND_NONE:
decoder_wait(dc);
break;
}
} while (dc->command != DECODE_COMMAND_NONE || !dc->quit);
decoder_unlock(dc);
return NULL;
}
void
decoder_thread_start(struct decoder_control *dc)
{
GError *e = NULL;
assert(dc->thread == NULL);
dc->quit = false;
dc->thread = g_thread_create(decoder_task, dc, true, &e);
if (dc->thread == NULL)
MPD_ERROR("Failed to spawn decoder task: %s", e->message);
}