__declspec(dllexport) void* DLL_LoadNSF(const char* szFileName)
{
nsf_init();
log_init();
nsf_t* result = nsf_load(const_cast<char*>(szFileName),NULL,0);
return result;
}
static nsf_t * load(char * filename)
{
int i;
nsf_t * nsf;
unsigned int total;
pdebug("nsf : load [%s]\n", filename);
nsf = nsf_load(filename,0,0);
if (!nsf) {
pdebug("nsf : [%s] load error.\n", filename);
return 0;
}
/* create missing frame info */
if (!nsf->song_frames) {
pdebug("nsf : no play time info, alloc buffer\n");
nsf->song_frames = calloc(nsf->num_songs + 1, sizeof (*nsf->song_frames));
}
if (!nsf->song_frames) {
pdebug ("nsf : [%s] malloc song playing tine buffer failed.\n", filename);
nsf_free(&nsf);
return 0;
}
for (i=1, total=0; i <= nsf->num_songs; ++i) {
unsigned int t = nsf->song_frames[i];
if (!t) {
t = 2 * 60 * nsf->playback_rate; /* default 2 minutes */
pdebug("nsf : track #%02d, set default time [%u frames]\n", i, t);
}
if (t / nsf->playback_rate < 5) {
pdebug("nsf : skipping track #%02d (short play time)\n", i);
t = 0; /* Avoid short time songs (sound FX) */
}
nsf->song_frames[i] = t;
total += t;
}
nsf->song_frames[0] = total;
return nsf;
}
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;
}
static gboolean
start_play_tune (GstNsfDec * nsfdec)
{
gboolean res;
nsfdec->nsf = nsf_load (NULL, GST_BUFFER_DATA (nsfdec->tune_buffer),
GST_BUFFER_SIZE (nsfdec->tune_buffer));
if (!nsfdec->nsf)
goto could_not_load;
if (!nsfdec_negotiate (nsfdec))
goto could_not_negotiate;
nsfdec->taglist = gst_tag_list_new ();
gst_tag_list_add (nsfdec->taglist, GST_TAG_MERGE_REPLACE,
GST_TAG_AUDIO_CODEC, "NES Sound Format", NULL);
if (nsfdec->nsf->artist_name)
gst_tag_list_add (nsfdec->taglist, GST_TAG_MERGE_REPLACE,
GST_TAG_ARTIST, nsfdec->nsf->artist_name, NULL);
if (nsfdec->nsf->song_name)
gst_tag_list_add (nsfdec->taglist, GST_TAG_MERGE_REPLACE,
GST_TAG_TITLE, nsfdec->nsf->song_name, NULL);
gst_element_post_message (GST_ELEMENT_CAST (nsfdec),
gst_message_new_tag (GST_OBJECT (nsfdec),
gst_tag_list_copy (nsfdec->taglist)));
nsf_playtrack (nsfdec->nsf,
nsfdec->tune_number, nsfdec->frequency, nsfdec->bits, nsfdec->stereo);
nsf_setfilter (nsfdec->nsf, nsfdec->filter);
nsfdec->bps = (nsfdec->bits >> 3) * nsfdec->channels;
/* calculate the number of bytes we need to output after each call to
* nsf_frame(). */
nsfdec->blocksize =
nsfdec->bps * nsfdec->frequency / nsfdec->nsf->playback_rate;
gst_pad_push_event (nsfdec->srcpad,
gst_event_new_new_segment (FALSE, 1.0, GST_FORMAT_TIME, 0, -1, 0));
res = gst_pad_start_task (nsfdec->srcpad,
(GstTaskFunction) play_loop, nsfdec->srcpad, NULL);
return res;
/* ERRORS */
could_not_load:
{
GST_ELEMENT_ERROR (nsfdec, LIBRARY, INIT,
("Could not load tune"), ("Could not load tune"));
return FALSE;
}
could_not_negotiate:
{
GST_ELEMENT_ERROR (nsfdec, CORE, NEGOTIATION,
("Could not negotiate format"), ("Could not negotiate format"));
return FALSE;
}
}
