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/*
* Copyright (C) 2003-2009 The Music Player Daemon Project
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "decoder_internal.h"
#include "decoder_control.h"
#include "player_control.h"
#include "pipe.h"
#include "input_stream.h"
#include "buffer.h"
#include "chunk.h"
#include <assert.h>
/**
* This is a wrapper for input_stream_buffer(). It assumes that the
* decoder is currently locked, and temporarily unlocks it while
* calling input_stream_buffer(). We shouldn't hold the lock during a
* potentially blocking operation.
*/
static int
decoder_input_buffer(struct decoder_control *dc, struct input_stream *is)
{
int ret;
decoder_unlock(dc);
ret = input_stream_buffer(is) > 0;
decoder_lock(dc);
return ret;
}
/**
* All chunks are full of decoded data; wait for the player to free
* one.
*/
static enum decoder_command
need_chunks(struct decoder_control *dc, struct input_stream *is, bool do_wait)
{
if (dc->command == DECODE_COMMAND_STOP ||
dc->command == DECODE_COMMAND_SEEK)
return dc->command;
if ((is == NULL || decoder_input_buffer(dc, is) <= 0) && do_wait) {
decoder_wait(dc);
player_signal();
return dc->command;
}
return DECODE_COMMAND_NONE;
}
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)
return decoder->chunk;
decoder_lock(dc);
cmd = need_chunks(dc, is, true);
decoder_unlock(dc);
} while (cmd == DECODE_COMMAND_NONE);
return NULL;
}
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;
}
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