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-rw-r--r--src/combined/nsf_decoder.c247
1 files changed, 247 insertions, 0 deletions
diff --git a/src/combined/nsf_decoder.c b/src/combined/nsf_decoder.c
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+++ b/src/combined/nsf_decoder.c
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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/xine_internal.h>
+#include <xine/audio_out.h>
+#include <xine/buffer.h>
+#include <xine/xineutils.h>
+#include "bswap.h"
+
+/* Nosefart includes */
+#include "types.h"
+#include "nsf.h"
+
+#include "nsf_combined.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 = calloc(1, 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 *) calloc(1, 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 allocates a private audio decoder class and initializes
+ * the class's member functions. */
+void *decoder_nsf_init_plugin (xine_t *xine, void *data) {
+
+ nsf_class_t *this ;
+
+ this = (nsf_class_t *) calloc(1, sizeof(nsf_class_t));
+
+ this->decoder_class.open_plugin = open_plugin;
+ this->decoder_class.identifier = "NSF";
+ this->decoder_class.description = N_("NES Music audio decoder plugin");
+ this->decoder_class.dispose = default_audio_decoder_class_dispose;
+
+ return this;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2025-04-25 21:13:37 +0000