/**
* Plays a #music_chunk object (after applying software volume). If
* it contains a (stream) tag, copy it to the current song, so MPD's
* playlist reflects the new stream tag.
*
* Player lock is not held.
*/
static bool
play_chunk(struct player_control *pc,
struct song *song, struct music_chunk *chunk,
const struct audio_format *format)
{
assert(music_chunk_check_format(chunk, format));
if (chunk->tag != NULL)
update_song_tag(song, chunk->tag);
if (chunk->length == 0) {
music_buffer_return(player_buffer, chunk);
return true;
}
player_lock(pc);
pc->bit_rate = chunk->bit_rate;
player_unlock(pc);
/* send the chunk to the audio outputs */
if (!audio_output_all_play(chunk))
return false;
pc->total_play_time += (double)chunk->length /
audio_format_time_to_size(format);
return true;
}
/**
* Sends a chunk of silence to the audio outputs. This is called when
* there is not enough decoded data in the pipe yet, to prevent
* underruns in the hardware buffers.
*
* The player lock is not held.
*/
static bool
player_send_silence(struct player *player)
{
assert(audio_format_defined(&player->play_audio_format));
struct music_chunk *chunk = music_buffer_allocate(player_buffer);
if (chunk == NULL) {
g_warning("Failed to allocate silence buffer");
return false;
}
#ifndef NDEBUG
chunk->audio_format = player->play_audio_format;
#endif
size_t frame_size =
audio_format_frame_size(&player->play_audio_format);
/* this formula ensures that we don't send
partial frames */
unsigned num_frames = sizeof(chunk->data) / frame_size;
chunk->times = -1.0; /* undefined time stamp */
chunk->length = num_frames * frame_size;
memset(chunk->data, 0, chunk->length);
if (!audio_output_all_play(chunk)) {
music_buffer_return(player_buffer, chunk);
return false;
}
return true;
}
void
decoder_command_finished(struct decoder *decoder)
{
struct decoder_control *dc = decoder->dc;
decoder_lock(dc);
assert(dc->command != DECODE_COMMAND_NONE);
assert(dc->command != DECODE_COMMAND_SEEK ||
dc->seek_error || decoder->seeking);
assert(dc->pipe != NULL);
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;
decoder_unlock(dc);
player_lock_signal();
}
void
decoder_flush_chunk(struct decoder *decoder)
{
struct decoder_control *dc = decoder->dc;
assert(decoder != NULL);
assert(decoder->chunk != NULL);
if (music_chunk_is_empty(decoder->chunk))
music_buffer_return(dc->buffer, decoder->chunk);
else
music_pipe_push(dc->pipe, decoder->chunk);
decoder->chunk = NULL;
}
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 */
if (decoder->chunk != NULL) {
music_buffer_return(dc.buffer, decoder->chunk);
decoder->chunk = NULL;
}
music_pipe_clear(dc.pipe, dc.buffer);
}
dc.command = DECODE_COMMAND_NONE;
notify_signal(&pc.notify);
}
/**
* 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;
}
