108 lines
2.6 KiB
C
108 lines
2.6 KiB
C
/*
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* Copyright (C) 2003-2009 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "decoder_internal.h"
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#include "decoder_control.h"
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#include "player_control.h"
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#include "pipe.h"
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#include "input_stream.h"
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#include "buffer.h"
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#include "chunk.h"
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#include <assert.h>
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/**
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* This is a wrapper for input_stream_buffer(). It assumes that the
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* decoder is currently locked, and temporarily unlocks it while
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* calling input_stream_buffer(). We shouldn't hold the lock during a
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* potentially blocking operation.
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*/
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static int
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decoder_input_buffer(struct input_stream *is)
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{
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int ret;
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decoder_unlock();
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ret = input_stream_buffer(is) > 0;
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decoder_lock();
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return ret;
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}
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/**
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* All chunks are full of decoded data; wait for the player to free
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* one.
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*/
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static enum decoder_command
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need_chunks(struct input_stream *is, bool do_wait)
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{
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if (dc.command == DECODE_COMMAND_STOP ||
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dc.command == DECODE_COMMAND_SEEK)
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return dc.command;
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if ((is == NULL || decoder_input_buffer(is) <= 0) && do_wait) {
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decoder_wait();
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decoder_unlock();
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notify_signal(&pc.notify);
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decoder_lock();
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return dc.command;
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}
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return DECODE_COMMAND_NONE;
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}
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struct music_chunk *
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decoder_get_chunk(struct decoder *decoder, struct input_stream *is)
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{
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enum decoder_command cmd;
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assert(decoder != NULL);
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if (decoder->chunk != NULL)
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return decoder->chunk;
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do {
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decoder->chunk = music_buffer_allocate(dc.buffer);
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if (decoder->chunk != NULL)
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return decoder->chunk;
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decoder_lock();
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cmd = need_chunks(is, true);
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decoder_unlock();
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} while (cmd == DECODE_COMMAND_NONE);
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return NULL;
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}
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void
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decoder_flush_chunk(struct decoder *decoder)
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{
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assert(decoder != NULL);
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assert(decoder->chunk != NULL);
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if (music_chunk_is_empty(decoder->chunk))
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music_buffer_return(dc.buffer, decoder->chunk);
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else
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music_pipe_push(dc.pipe, decoder->chunk);
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decoder->chunk = NULL;
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}
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