int handle_seek_opt(ogg123_options_t *options, decoder_t *decoder, format_t *format) {
float pos=decoder->format->statistics(decoder)->current_time;
/* this functions handles a seek request. It prevents seeking out
of band, i.e. before the beginning or after the end. Instead,
it seeks to the start or near-end resp. */
if (options->seekmode != DECODER_SEEK_NONE) {
if (options->seekmode == DECODER_SEEK_START) {
pos = options->seekoff;
} else {
pos += options->seekoff;
}
if (pos < 0) {
pos = 0;
}
if (pos > decoder->format->statistics(decoder)->total_time) {
/* seek to almost the end of the stream */
pos = decoder->format->statistics(decoder)->total_time - 0.01;
}
if (!format->seek(decoder, pos, DECODER_SEEK_START)) {
status_error(_("Could not skip to %f in audio stream."), options->seekoff);
#if 0
/* Handle this fatally -- kill the audio thread */
if (audio_buffer != NULL)
buffer_thread_kill(audio_buffer);
#endif
}
}
options->seekmode = DECODER_SEEK_NONE;
return 1;
}
void play (char *source_string)
{
transport_t *transport;
format_t *format;
data_source_t *source;
decoder_t *decoder;
decoder_callbacks_t decoder_callbacks;
void *decoder_callbacks_arg;
/* Preserve between calls so we only open the audio device when we
have to */
static audio_format_t old_audio_fmt = { 0, 0, 0, 0, 0 };
audio_format_t new_audio_fmt;
audio_reopen_arg_t *reopen_arg;
/* Flags and counters galore */
int eof = 0, eos = 0, ret;
int nthc = 0, ntimesc = 0;
int next_status = 0;
static int status_interval = 0;
/* Reset all of the signal flags */
sig_request.cancel = 0;
sig_request.skipfile = 0;
sig_request.exit = 0;
sig_request.pause = 0;
/* Set preferred audio format (used by decoder) */
new_audio_fmt.big_endian = ao_is_big_endian();
new_audio_fmt.signed_sample = 1;
new_audio_fmt.word_size = 2;
/* Select appropriate callbacks */
if (audio_buffer != NULL) {
decoder_callbacks.printf_error = &decoder_buffered_error_callback;
decoder_callbacks.printf_metadata = &decoder_buffered_metadata_callback;
decoder_callbacks_arg = audio_buffer;
} else {
decoder_callbacks.printf_error = &decoder_error_callback;
decoder_callbacks.printf_metadata = &decoder_metadata_callback;
decoder_callbacks_arg = NULL;
}
/* Locate and use transport for this data source */
if ( (transport = select_transport(source_string)) == NULL ) {
status_error(_("No module could be found to read from %s.\n"), source_string);
return;
}
if ( (source = transport->open(source_string, &options)) == NULL ) {
status_error(_("Cannot open %s.\n"), source_string);
return;
}
/* Detect the file format and initialize a decoder */
if ( (format = select_format(source)) == NULL ) {
status_error(_("The file format of %s is not supported.\n"), source_string);
return;
}
if ( (decoder = format->init(source, &options, &new_audio_fmt,
&decoder_callbacks,
decoder_callbacks_arg)) == NULL ) {
/* We may have failed because of user command */
if (!sig_request.cancel)
status_error(_("Error opening %s using the %s module."
" The file may be corrupted.\n"), source_string,
format->name);
return;
}
/* Decide which statistics are valid */
select_stats(stat_format, &options, source, decoder, audio_buffer);
/* Start the audio playback thread before we begin sending data */
if (audio_buffer != NULL) {
/* First reset mutexes and other synchronization variables */
buffer_reset (audio_buffer);
buffer_thread_start (audio_buffer);
}
/* Show which file we are playing */
decoder_callbacks.printf_metadata(decoder_callbacks_arg, 1,
_("Playing: %s"), source_string);
/* Skip over audio */
if (options.seekpos > 0.0) {
if (!format->seek(decoder, options.seekpos, DECODER_SEEK_START)) {
status_error(_("Could not skip %f seconds of audio."), options.seekpos);
if (audio_buffer != NULL)
buffer_thread_kill(audio_buffer);
return;
}
}
/* Main loop: Iterates over all of the logical bitstreams in the file */
while (!eof && !sig_request.exit) {
/* Loop through data within a logical bitstream */
eos = 0;
while (!eos && !sig_request.exit) {
/* Check signals */
if (sig_request.skipfile) {
eof = eos = 1;
break;
}
if (sig_request.pause) {
if (audio_buffer)
buffer_thread_pause (audio_buffer);
kill (getpid(), SIGSTOP); /* We block here until we unpause */
/* Done pausing */
if (audio_buffer)
buffer_thread_unpause (audio_buffer);
sig_request.pause = 0;
}
/* Read another block of audio data */
ret = format->read(decoder, convbuffer, convsize, &eos, &new_audio_fmt);
/* Bail if we need to */
if (ret == 0) {
eof = eos = 1;
break;
} else if (ret < 0) {
status_error(_("Error: Decoding failure.\n"));
break;
}
/* Check to see if the audio format has changed */
if (!audio_format_equal(&new_audio_fmt, &old_audio_fmt)) {
old_audio_fmt = new_audio_fmt;
/* Update our status printing interval */
status_interval = new_audio_fmt.word_size * new_audio_fmt.channels *
new_audio_fmt.rate / options.status_freq;
next_status = 0;
reopen_arg = new_audio_reopen_arg(options.devices, &new_audio_fmt);
if (audio_buffer)
buffer_insert_action_at_end(audio_buffer, &audio_reopen_action,
reopen_arg);
else
audio_reopen_action(NULL, reopen_arg);
}
/* Update statistics display if needed */
if (next_status <= 0) {
display_statistics(stat_format, audio_buffer, source, decoder);
next_status = status_interval;
} else
next_status -= ret;
if (options.endpos > 0.0 && options.endpos <= current_time(decoder)) {
eof = eos = 1;
break;
}
/* Write audio data block to output, skipping or repeating chunks
as needed */
do {
if (nthc-- == 0) {
if (audio_buffer)
buffer_submit_data(audio_buffer, convbuffer, ret);
else
audio_play_callback(convbuffer, ret, eos, &audio_play_arg);
nthc = options.nth - 1;
}
} while (!sig_request.exit && !sig_request.skipfile &&
++ntimesc < options.ntimes);
ntimesc = 0;
} /* End of data loop */
} /* End of logical bitstream loop */
/* Done playing this logical bitstream. Clean up house. */
if (audio_buffer) {
if (!sig_request.exit && !sig_request.skipfile) {
buffer_mark_eos(audio_buffer);
buffer_wait_for_empty(audio_buffer);
}
buffer_thread_kill(audio_buffer);
}
/* Print final stats */
display_statistics_quick(stat_format, audio_buffer, source, decoder);
format->cleanup(decoder);
transport->close(source);
status_reset_output_lock(); /* In case we were killed mid-output */
status_message(1, _("Done."));
if (sig_request.exit)
exit (0);
}