/* 2004.02.01 first released source code for IOMP */ /* * 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA * * NSF Audio "Decoder" using the Nosefart NSF engine by Matt Conte * http://www.baisoku.org/ * * $Id: nsf.c,v 1.2 2003/11/25 04:26:04 georgedon Exp $ */ #include #include #include #include #include #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 */ this->stream->meta_info[XINE_META_INFO_AUDIOCODEC] = strdup("NES Music (Nosefart)"); this->song_number = buf->content[4]; /* allocate a buffer for the file */ this->nsf_size = 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) { printf ("nsf: could not initialize NSF\n"); /* make the decoder return on every subsequent buffer */ this->nsf_index = 0; } 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, (this->channels == 2) ? AO_CAP_MODE_STEREO : AO_CAP_MODE_MONO); } /* 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) { printf ("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 *) malloc (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 *) malloc (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 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. */ plugin_info_t xine_plugin_info[] = { /* { type, API version, "name", version, special_info, init_function }, */ { PLUGIN_AUDIO_DECODER, 13, "nsf", XINE_VERSION_CODE, &dec_info_audio, &init_plugin }, { PLUGIN_NONE, 0, "", 0, NULL, NULL } };