/**
* The decoder has acknowledged the "START" command (see
* player_wait_for_decoder()). This function checks if the decoder
* initialization has completed yet.
*
* The player lock is not held.
*/
static bool
player_check_decoder_startup(struct player *player)
{
struct player_control *pc = player->pc;
struct decoder_control *dc = player->dc;
assert(player->decoder_starting);
decoder_lock(dc);
GError *error = dc_get_error(dc);
if (error != NULL) {
/* the decoder failed */
decoder_unlock(dc);
player_lock(pc);
pc_set_error(pc, PLAYER_ERROR_DECODER, error);
player_unlock(pc);
return false;
} else if (!decoder_is_starting(dc)) {
/* the decoder is ready and ok */
decoder_unlock(dc);
if (player->output_open &&
!audio_output_all_wait(pc, 1))
/* the output devices havn't finished playing
all chunks yet - wait for that */
return true;
player_lock(pc);
pc->total_time = real_song_duration(dc->song, dc->total_time);
pc->audio_format = dc->in_audio_format;
player_unlock(pc);
player->play_audio_format = dc->out_audio_format;
player->decoder_starting = false;
if (!player->paused && !player_open_output(player)) {
char *uri = song_get_uri(dc->song);
g_warning("problems opening audio device "
"while playing \"%s\"", uri);
g_free(uri);
return true;
}
return true;
} else {
/* the decoder is not yet ready; wait
some more */
player_wait_decoder(pc, dc);
decoder_unlock(dc);
return true;
}
}
/**
* Obtains the next chunk from the music pipe, optionally applies
* cross-fading, and sends it to all audio outputs.
*
* @return true on success, false on error (playback will be stopped)
*/
static bool
play_next_chunk(struct player *player)
{
struct player_control *pc = player->pc;
struct decoder_control *dc = player->dc;
if (!audio_output_all_wait(pc, 64))
/* the output pipe is still large enough, don't send
another chunk */
return true;
unsigned cross_fade_position;
struct music_chunk *chunk = NULL;
if (player->xfade == XFADE_ENABLED &&
player_dc_at_next_song(player) &&
(cross_fade_position = music_pipe_size(player->pipe))
<= player->cross_fade_chunks) {
/* perform cross fade */
struct music_chunk *other_chunk =
music_pipe_shift(dc->pipe);
if (!player->cross_fading) {
/* beginning of the cross fade - adjust
crossFadeChunks which might be bigger than
the remaining number of chunks in the old
song */
player->cross_fade_chunks = cross_fade_position;
player->cross_fading = true;
}
if (other_chunk != NULL) {
chunk = music_pipe_shift(player->pipe);
assert(chunk != NULL);
assert(chunk->other == NULL);
/* don't send the tags of the new song (which
is being faded in) yet; postpone it until
the current song is faded out */
player->cross_fade_tag =
tag_merge_replace(player->cross_fade_tag,
other_chunk->tag);
other_chunk->tag = NULL;
if (isnan(pc->mixramp_delay_seconds)) {
chunk->mix_ratio = ((float)cross_fade_position)
/ player->cross_fade_chunks;
} else {
chunk->mix_ratio = nan("");
}
if (music_chunk_is_empty(other_chunk)) {
/* the "other" chunk was a music_chunk
which had only a tag, but no music
data - we cannot cross-fade that;
but since this happens only at the
beginning of the new song, we can
easily recover by throwing it away
now */
music_buffer_return(player_buffer,
other_chunk);
other_chunk = NULL;
}
chunk->other = other_chunk;
} else {
/* there are not enough decoded chunks yet */
decoder_lock(dc);
if (decoder_is_idle(dc)) {
/* the decoder isn't running, abort
cross fading */
decoder_unlock(dc);
player->xfade = XFADE_DISABLED;
} else {
/* wait for the decoder */
decoder_signal(dc);
player_wait_decoder(pc, dc);
decoder_unlock(dc);
return true;
}
}
}
if (chunk == NULL)
chunk = music_pipe_shift(player->pipe);
assert(chunk != NULL);
/* insert the postponed tag if cross-fading is finished */
if (player->xfade != XFADE_ENABLED && player->cross_fade_tag != NULL) {
chunk->tag = tag_merge_replace(chunk->tag,
player->cross_fade_tag);
player->cross_fade_tag = NULL;
}
/* play the current chunk */
if (!play_chunk(player->pc, player->song, chunk,
&player->play_audio_format)) {
music_buffer_return(player_buffer, chunk);
player_lock(pc);
pc->error = PLAYER_ERROR_AUDIO;
/* pause: the user may resume playback as soon as an
audio output becomes available */
pc->state = PLAYER_STATE_PAUSE;
player->paused = true;
player_unlock(pc);
return false;
}
/* this formula should prevent that the decoder gets woken up
with each chunk; it is more efficient to make it decode a
larger block at a time */
decoder_lock(dc);
if (!decoder_is_idle(dc) &&
music_pipe_size(dc->pipe) <= (pc->buffered_before_play +
music_buffer_size(player_buffer) * 3) / 4)
decoder_signal(dc);
decoder_unlock(dc);
return true;
}
/**
* The decoder has acknowledged the "START" command (see
* player_wait_for_decoder()). This function checks if the decoder
* initialization has completed yet.
*
* The player lock is not held.
*/
static bool
player_check_decoder_startup(struct player *player)
{
struct player_control *pc = player->pc;
struct decoder_control *dc = player->dc;
assert(player->decoder_starting);
decoder_lock(dc);
if (decoder_has_failed(dc)) {
/* the decoder failed */
decoder_unlock(dc);
player_lock(pc);
pc->errored_song = dc->song;
pc->error = PLAYER_ERROR_FILE;
player_unlock(pc);
return false;
} else if (!decoder_is_starting(dc)) {
/* the decoder is ready and ok */
decoder_unlock(dc);
if (audio_format_defined(&player->play_audio_format) &&
!audio_output_all_wait(pc, 1))
/* the output devices havn't finished playing
all chunks yet - wait for that */
return true;
player_lock(pc);
pc->total_time = real_song_duration(dc->song, dc->total_time);
pc->audio_format = dc->in_audio_format;
player_unlock(pc);
player->play_audio_format = dc->out_audio_format;
player->decoder_starting = false;
if (!player->paused &&
!audio_output_all_open(&dc->out_audio_format,
player_buffer)) {
char *uri = song_get_uri(dc->song);
g_warning("problems opening audio device "
"while playing \"%s\"", uri);
g_free(uri);
player_lock(pc);
pc->error = PLAYER_ERROR_AUDIO;
/* pause: the user may resume playback as soon
as an audio output becomes available */
pc->state = PLAYER_STATE_PAUSE;
player_unlock(pc);
player->paused = true;
return true;
}
return true;
} else {
/* the decoder is not yet ready; wait
some more */
player_wait_decoder(pc, dc);
decoder_unlock(dc);
return true;
}
}
