/**
* 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;
}
struct music_chunk *
decoder_get_chunk(struct decoder *decoder, struct input_stream *is)
{
struct decoder_control *dc = decoder->dc;
enum decoder_command cmd;
assert(decoder != NULL);
if (decoder->chunk != NULL)
return decoder->chunk;
do {
decoder->chunk = music_buffer_allocate(dc->buffer);
if (decoder->chunk != NULL) {
decoder->chunk->replay_gain_serial =
decoder->replay_gain_serial;
if (decoder->replay_gain_serial != 0)
decoder->chunk->replay_gain_info =
decoder->replay_gain_info;
return decoder->chunk;
}
decoder_lock(dc);
cmd = need_chunks(dc, is, true);
decoder_unlock(dc);
} while (cmd == DECODE_COMMAND_NONE);
return NULL;
}
