mpd/src/decoder_api.c

/* the Music Player Daemon (MPD)
 * Copyright (C) 2003-2007 by Warren Dukes (warren.dukes@gmail.com)
 * Copyright (C) 2008 Max Kellermann <max@duempel.org>
 * This project's homepage is: http://www.musicpd.org
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include "decoder_internal.h"
#include "decoder_control.h"
#include "player_control.h"
#include "audio.h"
#include "song.h"

#include "utils.h"
#include "normalize.h"
#include "pipe.h"
#include "gcc.h"

#include <assert.h>

void decoder_initialized(struct decoder * decoder,
			 const struct audio_format *audio_format,
			 float total_time)
{
	assert(dc.state == DECODE_STATE_START);
	assert(audio_format != NULL);

	pcm_convert_init(&decoder->conv_state);

	dc.audioFormat = *audio_format;
	getOutputAudioFormat(audio_format, &ob.audioFormat);

	dc.totalTime = total_time;

	dc.state = DECODE_STATE_DECODE;
	notify_signal(&pc.notify);
}

const char *decoder_get_url(mpd_unused struct decoder * decoder, char * buffer)
{
	return song_get_url(dc.current_song, buffer);
}

enum decoder_command decoder_get_command(mpd_unused struct decoder * decoder)
{
	return dc.command;
}

void decoder_command_finished(mpd_unused struct decoder * decoder)
{
	assert(dc.command != DECODE_COMMAND_NONE);
	assert(dc.command != DECODE_COMMAND_SEEK ||
	       dc.seekError || decoder->seeking);

	if (dc.command == DECODE_COMMAND_SEEK)
		/* delete frames from the old song position */
		ob_clear();

	dc.command = DECODE_COMMAND_NONE;
	notify_signal(&pc.notify);
}

double decoder_seek_where(mpd_unused struct decoder * decoder)
{
	assert(dc.command == DECODE_COMMAND_SEEK);

	decoder->seeking = true;

	return dc.seekWhere;
}

void decoder_seek_error(struct decoder * decoder)
{
	assert(dc.command == DECODE_COMMAND_SEEK);

	dc.seekError = true;
	decoder_command_finished(decoder);
}

size_t decoder_read(struct decoder *decoder,
		    struct input_stream *inStream,
		    void *buffer, size_t length)
{
	size_t nbytes;

	assert(inStream != NULL);
	assert(buffer != NULL);

	while (true) {
		/* XXX don't allow decoder==NULL */
		if (decoder != NULL &&
		    (dc.command != DECODE_COMMAND_SEEK ||
		     !decoder->seeking) &&
		    dc.command != DECODE_COMMAND_NONE)
			return 0;

		nbytes = input_stream_read(inStream, buffer, length);
		if (nbytes > 0 || input_stream_eof(inStream))
			return nbytes;

		/* sleep for a fraction of a second! */
		/* XXX don't sleep, wait for an event instead */
		my_usleep(10000);
	}
}

/**
 * All chunks are full of decoded data; wait for the player to free
 * one.
 */
static enum decoder_command
need_chunks(struct decoder *decoder,
	    struct input_stream *inStream, int seekable)
{
	if (dc.command == DECODE_COMMAND_STOP)
		return DECODE_COMMAND_STOP;

	if (dc.command == DECODE_COMMAND_SEEK) {
		if (seekable) {
			return DECODE_COMMAND_SEEK;
		} else {
			decoder_seek_error(decoder);
		}
	}

	if (!inStream ||
	    input_stream_buffer(inStream) <= 0) {
		notify_wait(&dc.notify);
		notify_signal(&pc.notify);
	}

	return DECODE_COMMAND_NONE;
}

enum decoder_command
decoder_data(struct decoder *decoder,
	     struct input_stream *inStream, int seekable,
	     void *dataIn, size_t dataInLen,
	     float data_time, uint16_t bitRate,
	     ReplayGainInfo * replayGainInfo)
{
	size_t nbytes;
	char *data;
	size_t datalen;
	static char *convBuffer;
	static size_t convBufferLen;

	if (audio_format_equals(&ob.audioFormat, &dc.audioFormat)) {
		data = dataIn;
		datalen = dataInLen;
	} else {
		datalen = pcm_convert_size(&(dc.audioFormat), dataInLen,
					   &(ob.audioFormat));
		if (datalen > convBufferLen) {
			if (convBuffer != NULL)
				free(convBuffer);
			convBuffer = xmalloc(datalen);
			convBufferLen = datalen;
		}
		data = convBuffer;
		datalen = pcm_convert(&(dc.audioFormat), dataIn,
				      dataInLen, &(ob.audioFormat),
				      data, &decoder->conv_state);
	}

	if (replayGainInfo != NULL && (replayGainState != REPLAYGAIN_OFF))
		doReplayGain(replayGainInfo, data, datalen, &ob.audioFormat);
	else if (normalizationEnabled)
		normalizeData(data, datalen, &ob.audioFormat);

	while (datalen > 0) {
		nbytes = ob_append(data, datalen, data_time, bitRate);
		datalen -= nbytes;
		data += nbytes;

		if (datalen > 0) {
			enum decoder_command cmd =
				need_chunks(decoder, inStream, seekable);
			if (cmd != DECODE_COMMAND_NONE)
				return cmd;
		}
	}

	return DECODE_COMMAND_NONE;
}