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fix NULL permitted for out and fx pointer buffer

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Closes #659
This commit is contained in:
jjceresa 2020-08-06 17:26:42 +02:00 committed by derselbst
parent 2393aef3bd
commit 3ee2bbed96
1 changed files with 76 additions and 6 deletions
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82
src/synth/fluid_synth.c
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@ -3652,15 +3652,23 @@ fx[ ((k * fluid_synth_count_effects_channels() + j) * 2 + 1) % nfx ] = right_bu
*
* @param synth FluidSynth instance
* @param len Count of audio frames to synthesize and store in every single buffer provided by \p out and \p fx.
* @param nfx Count of arrays in \c fx. Must be a multiple of 2 (because of stereo)
* Zero value is permitted, the function does nothing and return FLUID_OK.
* @param nfx Count of arrays in \c fx. Must be a multiple of 2 (because of stereo).
* and in the range <code>0 <= nfx/2 <= (fluid_synth_count_effects_channels() * fluid_synth_count_effects_groups())</code>.
Note that zero value is valid and allows to skip mixing effects in all fx output buffers.
* @param fx Array of buffers to store effects audio to. Buffers may
alias with buffers of \c out. NULL buffers are permitted and will cause to skip mixing any audio into that buffer.
alias with buffers of \c out. Individual NULL buffers are permitted and will cause to skip mixing any audio into that buffer.
* @param nout Count of arrays in \c out. Must be a multiple of 2
(because of stereo) and in the range <code>0 <= nout/2 <= fluid_synth_count_audio_channels()</code>.
Note that zero value is valid and allows to skip mixing dry audio in all out output buffers.
* @param out Array of buffers to store (dry) audio to. Buffers may
alias with buffers of \c fx. NULL buffers are permitted and will cause to skip mixing any audio into that buffer.
* @return #FLUID_OK on success, #FLUID_FAILED otherwise.
alias with buffers of \c fx. Individual NULL buffers are permitted and will cause to skip mixing any audio into that buffer.
* @return #FLUID_OK on success,
* #FLUID_FAILED otherwise,
* - <code>fx == NULL</code> while <code>nfx > 0</code>, or <code>out == NULL</code> while <code>nout > 0</code>.
* - \c nfx or \c nout not multiple of 2.
* - <code>len < 0</code>.
* - \c nfx or \c nout exceed the range explained above.
*
* @parblock
* @note The owner of the sample buffers must zero them out before calling this
@ -3690,6 +3698,7 @@ fluid_synth_process(fluid_synth_t *synth, int len, int nfx, float *fx[],
return fluid_synth_process_LOCAL(synth, len, nfx, fx, nout, out, fluid_synth_render_blocks);
}
/* declared public (instead of static) for testing purpose */
int
fluid_synth_process_LOCAL(fluid_synth_t *synth, int len, int nfx, float *fx[],
int nout, float *out[], int (*block_render_func)(fluid_synth_t *, int))
@ -3704,8 +3713,23 @@ fluid_synth_process_LOCAL(fluid_synth_t *synth, int len, int nfx, float *fx[],
float cpu_load;
fluid_return_val_if_fail(synth != NULL, FLUID_FAILED);
/* fx NULL while nfx > 0 is invalid */
fluid_return_val_if_fail((fx != NULL) || (nfx == 0), FLUID_FAILED);
/* nfx must be multiple of 2. Note that 0 value is valid and
allows to skip mixing in fx output buffers
*/
fluid_return_val_if_fail(nfx % 2 == 0, FLUID_FAILED);
/* out NULL while nout > 0 is invalid */
fluid_return_val_if_fail((out != NULL) || (nout == 0), FLUID_FAILED);
/* nout must be multiple of 2. Note that 0 value is valid and
allows to skip mixing in out output buffers
*/
fluid_return_val_if_fail(nout % 2 == 0, FLUID_FAILED);
/* check len value. Note that 0 value is valid, the function does nothing and returns FLUID_OK.
*/
fluid_return_val_if_fail(len >= 0, FLUID_FAILED);
fluid_return_val_if_fail(len != 0, FLUID_OK); // to avoid raising FE_DIVBYZERO below
@ -3716,33 +3740,49 @@ fluid_synth_process_LOCAL(fluid_synth_t *synth, int len, int nfx, float *fx[],
fluid_return_val_if_fail(0 <= nfx / 2 && nfx / 2 <= nfxchan * nfxunits, FLUID_FAILED);
fluid_return_val_if_fail(0 <= nout / 2 && nout / 2 <= naudchan, FLUID_FAILED);
/* get internal mixer audio dry buffer's pointer (left and right channel) */
fluid_rvoice_mixer_get_bufs(synth->eventhandler->mixer, &left_in, &right_in);
/* get internal mixer audio effect buffer's pointer (left and right channel) */
fluid_rvoice_mixer_get_fx_bufs(synth->eventhandler->mixer, &fx_left_in, &fx_right_in);
/* Conversely to fluid_synth_write_float(),fluid_synth_write_s16() (which handle only one
stereo output) we don't want rendered audio effect mixed in internal audio dry buffers.
FALSE instructs the mixer that internal audio effects will be mixed in respective internal
audio effects buffers.
*/
fluid_rvoice_mixer_set_mix_fx(synth->eventhandler->mixer, FALSE);
/* First, take what's still available in the buffer */
count = 0;
/* synth->cur indicates if available samples are still in internal mixer buffer */
num = synth->cur;
buffered_blocks = (synth->cur + FLUID_BUFSIZE - 1) / FLUID_BUFSIZE;
if(synth->cur < buffered_blocks * FLUID_BUFSIZE)
{
/* yes, available sample are in internal mixer buffer */
int available = (buffered_blocks * FLUID_BUFSIZE) - synth->cur;
num = (available > len) ? len : available;
/* mixing dry samples (or skip if requested by the caller) */
if(nout != 0)
{
for(i = 0; i < naudchan; i++)
{
/* mix num left samples from input mixer buffer (left_in) at input offset
synth->cur to output buffer (out_buf) at offset 0 */
float *out_buf = out[(i * 2) % nout];
fluid_synth_mix_single_buffer(out_buf, 0, left_in, synth->cur, i, num);
/* mix num right samples from input mixer buffer (right_in) at input offset
synth->cur to output buffer (out_buf) at offset 0 */
out_buf = out[(i * 2 + 1) % nout];
fluid_synth_mix_single_buffer(out_buf, 0, right_in, synth->cur, i, num);
}
}
/* mixing effects samples (or skip if requested by the caller) */
if(nfx != 0)
{
// loop over all effects units
@ -3753,9 +3793,13 @@ fluid_synth_process_LOCAL(fluid_synth_t *synth, int len, int nfx, float *fx[],
{
int buf_idx = f * nfxchan + i;
/* mix num left samples from input mixer buffer (fx_left_in) at input offset
synth->cur to output buffer (out_buf) at offset 0 */
float *out_buf = fx[(buf_idx * 2) % nfx];
fluid_synth_mix_single_buffer(out_buf, 0, fx_left_in, synth->cur, buf_idx, num);
/* mix num right samples from input mixer buffer (fx_right_in) at input offset
synth->cur to output buffer (out_buf) at offset 0 */
out_buf = fx[(buf_idx * 2 + 1) % nfx];
fluid_synth_mix_single_buffer(out_buf, 0, fx_right_in, synth->cur, buf_idx, num);
}
@ -3769,23 +3813,31 @@ fluid_synth_process_LOCAL(fluid_synth_t *synth, int len, int nfx, float *fx[],
/* Then, render blocks and copy till we have 'len' samples */
while(count < len)
{
/* always render full bloc multiple of FLUID_BUFSIZE */
int blocksleft = (len - count + FLUID_BUFSIZE - 1) / FLUID_BUFSIZE;
/* render audio (dry and effect) to respective internal dry and effect buffers */
int blockcount = block_render_func(synth, blocksleft);
num = (blockcount * FLUID_BUFSIZE > len - count) ? len - count : blockcount * FLUID_BUFSIZE;
/* mixing dry samples (or skip if requested by the caller) */
if(nout != 0)
{
for(i = 0; i < naudchan; i++)
{
/* mix num left samples from input mixer buffer (left_in) at input offset
0 to output buffer (out_buf) at offset count */
float *out_buf = out[(i * 2) % nout];
fluid_synth_mix_single_buffer(out_buf, count, left_in, 0, i, num);
/* mix num right samples from input mixer buffer (right_in) at input offset
0 to output buffer (out_buf) at offset count */
out_buf = out[(i * 2 + 1) % nout];
fluid_synth_mix_single_buffer(out_buf, count, right_in, 0, i, num);
}
}
/* mixing effects samples (or skip if requested by the caller) */
if(nfx != 0)
{
// loop over all effects units
@ -3796,9 +3848,13 @@ fluid_synth_process_LOCAL(fluid_synth_t *synth, int len, int nfx, float *fx[],
{
int buf_idx = f * nfxchan + i;
/* mix num left samples from input mixer buffer (fx_left_in) at input offset
0 to output buffer (out_buf) at offset count */
float *out_buf = fx[(buf_idx * 2) % nfx];
fluid_synth_mix_single_buffer(out_buf, count, fx_left_in, 0, buf_idx, num);
/* mix num right samples from input mixer buffer (fx_right_in) at input offset
0 to output buffer (out_buf) at offset count */
out_buf = fx[(buf_idx * 2 + 1) % nfx];
fluid_synth_mix_single_buffer(out_buf, count, fx_right_in, 0, buf_idx, num);
}
@ -3866,7 +3922,13 @@ fluid_synth_write_float_LOCAL(fluid_synth_t *synth, int len,
fluid_return_val_if_fail(len >= 0, FLUID_FAILED);
fluid_return_val_if_fail(len != 0, FLUID_OK); // to avoid raising FE_DIVBYZERO below
fluid_rvoice_mixer_set_mix_fx(synth->eventhandler->mixer, 1);
/* Conversely to fluid_synth_process() (which handle possible multiple stereo output),
we want rendered audio effect mixed in internal audio dry buffers.
TRUE instructs the mixer that internal audio effects will be mixed in first internal
audio dry buffers.
*/
fluid_rvoice_mixer_set_mix_fx(synth->eventhandler->mixer, TRUE);
/* get first internal mixer audio dry buffer's pointer (left and right channel) */
fluid_rvoice_mixer_get_bufs(synth->eventhandler->mixer, &left_in, &right_in);
size = len;
@ -3877,6 +3939,7 @@ fluid_synth_write_float_LOCAL(fluid_synth_t *synth, int len,
/* fill up the buffers as needed */
if(cur >= synth->curmax)
{
/* render audio (dry and effect) to internal dry buffers */
int blocksleft = (size + FLUID_BUFSIZE - 1) / FLUID_BUFSIZE;
synth->curmax = FLUID_BUFSIZE * block_render_func(synth, blocksleft);
fluid_rvoice_mixer_get_bufs(synth->eventhandler->mixer, &left_in, &right_in);
@ -4024,7 +4087,13 @@ fluid_synth_write_s16(fluid_synth_t *synth, int len,
fluid_return_val_if_fail(len >= 0, FLUID_FAILED);
fluid_return_val_if_fail(len != 0, FLUID_OK); // to avoid raising FE_DIVBYZERO below
fluid_rvoice_mixer_set_mix_fx(synth->eventhandler->mixer, 1);
/* Conversely to fluid_synth_process() (which handle possible multiple stereo output),
we want rendered audio effect mixed in internal audio dry buffers.
TRUE instructs the mixer that internal audio effects will be mixed in first internal
audio dry buffers.
*/
fluid_rvoice_mixer_set_mix_fx(synth->eventhandler->mixer, TRUE);
/* get first internal mixer audio dry buffer's pointer (left and right channel) */
fluid_rvoice_mixer_get_bufs(synth->eventhandler->mixer, &left_in, &right_in);
size = len;
@ -4036,6 +4105,7 @@ fluid_synth_write_s16(fluid_synth_t *synth, int len,
/* fill up the buffers as needed */
if(cur >= synth->curmax)
{
/* render audio (dry and effect) to internal dry buffers */
int blocksleft = (size + FLUID_BUFSIZE - 1) / FLUID_BUFSIZE;
synth->curmax = FLUID_BUFSIZE * fluid_synth_render_blocks(synth, blocksleft);
fluid_rvoice_mixer_get_bufs(synth->eventhandler->mixer, &left_in, &right_in);