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Redundant stuff between interleave and nolayout moved into vgmstream. Other layouts should also be able to use this for common things.

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git-svn-id: https://vgmstream.svn.sourceforge.net/svnroot/vgmstream@18 51a99a44-fe44-0410-b1ba-c3e57ba2b86b
This commit is contained in:
halleyscometsw 2008-02-05 06:21:57 +00:00
parent d80919154b
commit 00c1a3abdb
4 changed files with 78 additions and 104 deletions
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68
src/layout/interleave.c
View File

@ -16,71 +16,14 @@ void render_vgmstream_interleave(sample * buffer, int32_t sample_count, VGMSTREA
}
while (samples_written<sample_count) {
int samples_to_do;
int chan;
int samples_left_this_block;
/*samples_this_block -= vgmstream->samples_into_block;*/
samples_left_this_block = samples_this_block - vgmstream->samples_into_block;
samples_to_do = samples_left_this_block;
/* fun loopy crap */
/* Why did I think this would be any simpler? */
if (vgmstream->loop_flag) {
/* is this the loop end? */
if (vgmstream->current_sample==vgmstream->loop_end_sample) {
/* depending on the codec we may not want to copy all of the state */
/*
switch (vgmstream->coding_type) {
case coding_CRI_ADX:
case coding_NGC_DSP:
{
int i;
for (i=0;i<vgmstream->channels;i++) {
vgmstream->loop_ch[i].adpcm_history1_32 = vgmstream->ch[i].adpcm_history1_32;
vgmstream->loop_ch[i].adpcm_history2_32 = vgmstream->ch[i].adpcm_history2_32;
}
}
break;
default:
break;
}
*/
/* restore! */
memcpy(vgmstream->ch,vgmstream->loop_ch,sizeof(VGMSTREAMCHANNEL)*vgmstream->channels);
vgmstream->current_sample=vgmstream->loop_sample;
vgmstream->samples_into_block=vgmstream->loop_samples_into_block;
samples_this_block = vgmstream->interleave_block_size / frame_size * samples_per_frame;
continue; /* recalculate stuff */
}
/* is this the loop start? */
if (!vgmstream->hit_loop && vgmstream->current_sample==vgmstream->loop_start_sample) {
/* save! */
memcpy(vgmstream->loop_ch,vgmstream->ch,sizeof(VGMSTREAMCHANNEL)*vgmstream->channels);
vgmstream->loop_sample=vgmstream->current_sample;
vgmstream->loop_samples_into_block=vgmstream->samples_into_block;
vgmstream->hit_loop=1;
}
/* are we going to hit the loop end during this block? */
if (vgmstream->current_sample+samples_left_this_block > vgmstream->loop_end_sample) {
/* only do to just before it */
samples_to_do = vgmstream->loop_end_sample-vgmstream->current_sample;
}
/* are we going to hit the loop start during this block? */
if (!vgmstream->hit_loop && vgmstream->current_sample+samples_left_this_block > vgmstream->loop_start_sample) {
/* only do to just before it */
samples_to_do = vgmstream->loop_start_sample-vgmstream->current_sample;
}
int samples_to_do;
if (vgmstream->loop_flag && vgmstream_do_loop(vgmstream)) {
samples_this_block = vgmstream->interleave_block_size / frame_size * samples_per_frame;
continue;
}
if (samples_per_frame>1 && (vgmstream->samples_into_block%samples_per_frame)+samples_to_do>samples_per_frame) samples_to_do=samples_per_frame-(vgmstream->samples_into_block%samples_per_frame);
samples_to_do = vgmstream_samples_to_do(samples_this_block, samples_per_frame, vgmstream);
if (samples_written+samples_to_do > sample_count)
samples_to_do=sample_count-samples_written;
@ -92,6 +35,7 @@ void render_vgmstream_interleave(sample * buffer, int32_t sample_count, VGMSTREA
vgmstream->samples_into_block+=samples_to_do;
if (vgmstream->samples_into_block==samples_this_block) {
int chan;
if (vgmstream->layout_type == layout_interleave_shortblock &&
vgmstream->current_sample + samples_this_block > vgmstream->num_samples) {

45
src/layout/nolayout.c
View File

@ -9,51 +9,12 @@ void render_vgmstream_nolayout(sample * buffer, int32_t sample_count, VGMSTREAM
while (samples_written<sample_count) {
int samples_to_do;
int chan;
int samples_left_this_block;
samples_left_this_block = samples_this_block - vgmstream->samples_into_block;
samples_to_do = samples_left_this_block;
/* fun loopy crap */
/* Why did I think this would be any simpler? */
if (vgmstream->loop_flag) {
/* is this the loop end? */
if (vgmstream->current_sample==vgmstream->loop_end_sample) {
/* restore! */
memcpy(vgmstream->ch,vgmstream->loop_ch,sizeof(VGMSTREAMCHANNEL)*vgmstream->channels);
vgmstream->current_sample=vgmstream->loop_sample;
vgmstream->samples_into_block=vgmstream->loop_samples_into_block;
continue; /* recalculate stuff */
}
/* is this the loop start? */
if (!vgmstream->hit_loop && vgmstream->current_sample==vgmstream->loop_start_sample) {
/* save! */
memcpy(vgmstream->loop_ch,vgmstream->ch,sizeof(VGMSTREAMCHANNEL)*vgmstream->channels);
vgmstream->loop_sample=vgmstream->current_sample;
vgmstream->loop_samples_into_block=vgmstream->samples_into_block;
vgmstream->hit_loop=1;
}
/* are we going to hit the loop end during this block? */
if (vgmstream->current_sample+samples_left_this_block > vgmstream->loop_end_sample) {
/* only do to just before it */
samples_to_do = vgmstream->loop_end_sample-vgmstream->current_sample;
}
/* are we going to hit the loop start during this block? */
if (!vgmstream->hit_loop && vgmstream->current_sample+samples_left_this_block > vgmstream->loop_start_sample) {
/* only do to just before it */
samples_to_do = vgmstream->loop_start_sample-vgmstream->current_sample;
}
if (vgmstream->loop_flag && vgmstream_do_loop(vgmstream)) {
continue;
}
if (samples_per_frame > 1 && (vgmstream->samples_into_block%samples_per_frame)+samples_to_do>samples_per_frame) samples_to_do=samples_per_frame-(vgmstream->samples_into_block%samples_per_frame);
samples_to_do = vgmstream_samples_to_do(samples_this_block, samples_per_frame, vgmstream);
if (samples_written+samples_to_do > sample_count)
samples_to_do=sample_count-samples_written;

57
src/vgmstream.c
View File

@ -188,3 +188,60 @@ void decode_vgmstream(VGMSTREAM * vgmstream, int samples_written, int samples_to
break;
}
}
int vgmstream_samples_to_do(int samples_this_block, int samples_per_frame, VGMSTREAM * vgmstream) {
int samples_to_do;
int samples_left_this_block;
samples_left_this_block = samples_this_block - vgmstream->samples_into_block;
samples_to_do = samples_left_this_block;
/* fun loopy crap */
/* Why did I think this would be any simpler? */
if (vgmstream->loop_flag) {
/* are we going to hit the loop end during this block? */
if (vgmstream->current_sample+samples_left_this_block > vgmstream->loop_end_sample) {
/* only do to just before it */
samples_to_do = vgmstream->loop_end_sample-vgmstream->current_sample;
}
/* are we going to hit the loop start during this block? */
if (!vgmstream->hit_loop && vgmstream->current_sample+samples_left_this_block > vgmstream->loop_start_sample) {
/* only do to just before it */
samples_to_do = vgmstream->loop_start_sample-vgmstream->current_sample;
}
}
/* if it's a framed encoding don't do more than one frame */
if (samples_per_frame>1 && (vgmstream->samples_into_block%samples_per_frame)+samples_to_do>samples_per_frame) samples_to_do=samples_per_frame-(vgmstream->samples_into_block%samples_per_frame);
return samples_to_do;
}
/* return 1 if we just looped */
int vgmstream_do_loop(VGMSTREAM * vgmstream) {
/* if (vgmstream->loop_flag) {*/
/* is this the loop end? */
if (vgmstream->current_sample==vgmstream->loop_end_sample) {
/* restore! */
memcpy(vgmstream->ch,vgmstream->loop_ch,sizeof(VGMSTREAMCHANNEL)*vgmstream->channels);
vgmstream->current_sample=vgmstream->loop_sample;
vgmstream->samples_into_block=vgmstream->loop_samples_into_block;
return 1;
}
/* is this the loop start? */
if (!vgmstream->hit_loop && vgmstream->current_sample==vgmstream->loop_start_sample) {
/* save! */
memcpy(vgmstream->loop_ch,vgmstream->ch,sizeof(VGMSTREAMCHANNEL)*vgmstream->channels);
vgmstream->loop_sample=vgmstream->current_sample;
vgmstream->loop_samples_into_block=vgmstream->samples_into_block;
vgmstream->hit_loop=1;
}
/*}*/
return 0;
}

12
src/vgmstream.h
View File

@ -139,14 +139,26 @@ VGMSTREAM * allocate_vgmstream(int channel_count, int looped);
/* deallocate, close, etc. */
void close_vgmstream(VGMSTREAM * vgmstream);
/* calculate the number of samples to be played based on looping parameters */
int32_t get_vgmstream_play_samples(double looptimes, double fadetime, VGMSTREAM * vgmstream);
/* render! */
void render_vgmstream(sample * buffer, int32_t sample_count, VGMSTREAM * vgmstream);
/* smallest self-contained group of samples is a frame */
int get_vgmstream_samples_per_frame(VGMSTREAM * vgmstream);
/* number of bytes per frame */
int get_vgmstream_frame_size(VGMSTREAM * vgmstream);
/* Assume that we have written samples_written into the buffer already, and we have samples_to_do consecutive
* samples ahead of us. Decode those samples into the buffer. */
void decode_vgmstream(VGMSTREAM * vgmstream, int samples_written, int samples_to_do, sample * buffer);
/* calculate number of consecutive samples to do (taking into account stopping for loop start and end) */
int vgmstream_samples_to_do(int samples_this_block, int samples_per_frame, VGMSTREAM * vgmstream);
/* Detect start and save values, also detect end and restore values. Only works on exact sample values.
* Returns 1 if loop was done. */
int vgmstream_do_loop(VGMSTREAM * vgmstream);
#endif