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/*
* Copyright (C) 2000-2001 the xine project
*
* This file is part of xine, a free video player.
*
* xine 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.
*
* xine 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, USA
*
* NSF Audio "Decoder" using the Nosefart NSF engine by Matt Conte
* http://www.baisoku.org/
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <unistd.h>
#include "xine_internal.h"
#include "audio_out.h"
#include "buffer.h"
#include "xineutils.h"
#include "bswap.h"
/* Nosefart includes */
#include "nosefart/types.h"
#include "nosefart/nsf.h"
typedef struct {
audio_decoder_class_t decoder_class;
} nsf_class_t;
typedef struct nsf_decoder_s {
audio_decoder_t audio_decoder;
xine_stream_t *stream;
int sample_rate; /* audio sample rate */
int bits_per_sample; /* bits/sample, usually 8 or 16 */
int channels; /* 1 or 2, usually */
int output_open; /* flag to indicate audio is ready */
int nsf_size;
unsigned char *nsf_file;
int nsf_index;
int song_number;
/* nsf-specific variables */
int64_t last_pts;
unsigned int iteration;
nsf_t *nsf;
} nsf_decoder_t;
/**************************************************************************
* xine audio plugin functions
*************************************************************************/
static void nsf_decode_data (audio_decoder_t *this_gen, buf_element_t *buf) {
nsf_decoder_t *this = (nsf_decoder_t *) this_gen;
audio_buffer_t *audio_buffer;
if (buf->decoder_flags & BUF_FLAG_HEADER) {
/* When the engine sends a BUF_FLAG_HEADER flag, it is time to initialize
* the decoder. The buffer element type has 4 decoder_info fields,
* 0..3. Field 1 is the sample rate. Field 2 is the bits/sample. Field
* 3 is the number of channels. */
this->sample_rate = buf->decoder_info[1];
this->bits_per_sample = buf->decoder_info[2];
this->channels = buf->decoder_info[3];
/* take this opportunity to initialize stream/meta information */
_x_meta_info_set_utf8(this->stream, XINE_META_INFO_AUDIOCODEC,
"NES Music (Nosefart)");
this->song_number = buf->content[4];
/* allocate a buffer for the file */
this->nsf_size = _X_BE_32(&buf->content[0]);
this->nsf_file = xine_xmalloc(this->nsf_size);
this->nsf_index = 0;
/* peform any other required initialization */
this->last_pts = -1;
this->iteration = 0;
return;
}
/* accumulate chunks from the NSF file until whole file is received */
if (this->nsf_index < this->nsf_size) {
xine_fast_memcpy(&this->nsf_file[this->nsf_index], buf->content,
buf->size);
this->nsf_index += buf->size;
if (this->nsf_index == this->nsf_size) {
/* file has been received, proceed to initialize engine */
nsf_init();
this->nsf = nsf_load(NULL, this->nsf_file, this->nsf_size);
if (!this->nsf) {
xprintf (this->stream->xine, XINE_VERBOSITY_DEBUG, "nsf: could not initialize NSF\n");
/* make the decoder return on every subsequent buffer */
this->nsf_index = 0;
return;
}
this->nsf->current_song = this->song_number;
nsf_playtrack(this->nsf, this->nsf->current_song, this->sample_rate,
this->bits_per_sample, this->channels);
}
return;
}
/* if the audio output is not open yet, open the audio output */
if (!this->output_open) {
this->output_open = (this->stream->audio_out->open) (
this->stream->audio_out,
this->stream,
this->bits_per_sample,
this->sample_rate,
_x_ao_channels2mode(this->channels));
}
/* if the audio still isn't open, do not go any further with the decode */
if (!this->output_open)
return;
/* check if a song change was requested */
if (buf->decoder_info[1]) {
this->nsf->current_song = buf->decoder_info[1];
nsf_playtrack(this->nsf, this->nsf->current_song, this->sample_rate,
this->bits_per_sample, this->channels);
}
/* time to decode a frame */
if (this->last_pts != -1) {
/* process a frame */
nsf_frame(this->nsf);
/* get an audio buffer */
audio_buffer = this->stream->audio_out->get_buffer (this->stream->audio_out);
if (audio_buffer->mem_size == 0) {
xprintf (this->stream->xine, XINE_VERBOSITY_DEBUG, "nsf: Help! Allocated audio buffer with nothing in it!\n");
return;
}
apu_process(audio_buffer->mem, this->sample_rate / this->nsf->playback_rate);
audio_buffer->vpts = buf->pts;
audio_buffer->num_frames = this->sample_rate / this->nsf->playback_rate;
this->stream->audio_out->put_buffer (this->stream->audio_out, audio_buffer, this->stream);
}
this->last_pts = buf->pts;
}
/* This function resets the state of the audio decoder. This usually
* entails resetting the data accumulation buffer. */
static void nsf_reset (audio_decoder_t *this_gen) {
nsf_decoder_t *this = (nsf_decoder_t *) this_gen;
this->last_pts = -1;
}
/* This function resets the last pts value of the audio decoder. */
static void nsf_discontinuity (audio_decoder_t *this_gen) {
nsf_decoder_t *this = (nsf_decoder_t *) this_gen;
this->last_pts = -1;
}
/* This function closes the audio output and frees the private audio decoder
* structure. */
static void nsf_dispose (audio_decoder_t *this_gen) {
nsf_decoder_t *this = (nsf_decoder_t *) this_gen;
/* close the audio output */
if (this->output_open)
this->stream->audio_out->close (this->stream->audio_out, this->stream);
this->output_open = 0;
/* free anything that was allocated during operation */
nsf_free(&this->nsf);
free(this->nsf_file);
free(this);
}
/* This function allocates, initializes, and returns a private audio
* decoder structure. */
static audio_decoder_t *open_plugin (audio_decoder_class_t *class_gen, xine_stream_t *stream) {
nsf_decoder_t *this ;
this = (nsf_decoder_t *) xine_xmalloc (sizeof (nsf_decoder_t));
/* connect the member functions */
this->audio_decoder.decode_data = nsf_decode_data;
this->audio_decoder.reset = nsf_reset;
this->audio_decoder.discontinuity = nsf_discontinuity;
this->audio_decoder.dispose = nsf_dispose;
/* connect the stream */
this->stream = stream;
/* audio output is not open at the start */
this->output_open = 0;
/* initialize the basic audio parameters */
this->channels = 0;
this->sample_rate = 0;
this->bits_per_sample = 0;
/* return the newly-initialized audio decoder */
return &this->audio_decoder;
}
/* This function returns a brief string that describes (usually with the
* decoder's most basic name) the audio decoder plugin. */
static char *get_identifier (audio_decoder_class_t *this) {
return "NSF";
}
/* This function returns a slightly longer string describing the audio
* decoder plugin. */
static char *get_description (audio_decoder_class_t *this) {
return "NES Music audio decoder plugin";
}
/* This function frees the audio decoder class and any other memory that was
* allocated. */
static void dispose_class (audio_decoder_class_t *this_gen) {
nsf_class_t *this = (nsf_class_t *)this_gen;
free (this);
}
/* This function allocates a private audio decoder class and initializes
* the class's member functions. */
static void *init_plugin (xine_t *xine, void *data) {
nsf_class_t *this ;
this = (nsf_class_t *) xine_xmalloc (sizeof (nsf_class_t));
this->decoder_class.open_plugin = open_plugin;
this->decoder_class.get_identifier = get_identifier;
this->decoder_class.get_description = get_description;
this->decoder_class.dispose = dispose_class;
return this;
}
/* This is a list of all of the internal xine audio buffer types that
* this decoder is able to handle. Check src/xine-engine/buffer.h for a
* list of valid buffer types (and add a new one if the one you need does
* not exist). Terminate the list with a 0. */
static uint32_t audio_types[] = {
BUF_AUDIO_NSF,
0
};
/* This data structure combines the list of supported xine buffer types and
* the priority that the plugin should be given with respect to other
* plugins that handle the same buffer type. A plugin with priority (n+1)
* will be used instead of a plugin with priority (n). */
static const decoder_info_t dec_info_audio = {
audio_types, /* supported types */
5 /* priority */
};
/* The plugin catalog entry. This is the only information that this plugin
* will export to the public. */
const plugin_info_t xine_plugin_info[] EXPORTED = {
/* { type, API version, "name", version, special_info, init_function }, */
{ PLUGIN_AUDIO_DECODER, 15, "nsf", XINE_VERSION_CODE, &dec_info_audio, &init_plugin },
{ PLUGIN_NONE, 0, "", 0, NULL, NULL }
};