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compressor remove static delay line buffer

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core_alloc works well for this and we can allow the alloc to be moved

bugfix compressor_process() possible buffer overflow

Change-Id: I701c6306c39cc1c7aa72b0dbe402b9b0d1a3fcda
This commit is contained in:
William Wilgus 2024-12-27 01:59:32 -05:00
parent 0c4b78c011
commit dca70e1816
1 changed files with 29 additions and 8 deletions
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37
lib/rbcodec/dsp/compressor.c
View file

@ -22,6 +22,7 @@
#include "fixedpoint.h"
#include "fracmul.h"
#include <string.h>
#include "core_alloc.h"
/* Define LOGF_ENABLE to enable logf output in this file
* #define LOGF_ENABLE
@ -66,7 +67,8 @@ static int32_t hp1y1 IBSS_ATTR; /* hpf2 y[n-1] */
static int32_t hp2y1 IBSS_ATTR; /* hpf2 y[n-1] */
/* Delay Line for look-ahead compression */
static int32_t labuf[MAX_CH][MAX_DLY]; /* look-ahead buffer */
static int labuf_handle = -1;
//static int32_t labuf[MAX_CH][MAX_DLY]; /* look-ahead buffer */
static int32_t delay_time;
static int32_t delay_write;
static int32_t delay_read;
@ -150,7 +152,24 @@ static bool compressor_update(struct dsp_config *dsp,
attcb = 0;
}
if (threshold < 0 && labuf_handle <= 0)
{
labuf_handle = core_alloc(sizeof(int32_t[MAX_CH][MAX_DLY]));
if (labuf_handle < 0)
{
logf("%s Failed to allocate %d bytes",
__func__, (int)sizeof(int32_t[MAX_CH][MAX_DLY]));
return false;
}
logf(" Compressor Allocated %d bytes", (int)sizeof(int32_t[MAX_CH][MAX_DLY]));
}
#if 0 /* don't really need this */
if (threshold >= 0 && labuf_handle > 0)
{
labuf_handle = core_free(labuf_handle);
logf(" Compressor Freed %d bytes", (int)sizeof(int32_t[MAX_CH][MAX_DLY]));
}
#endif
/* Sidechain pre-emphasis filter coefficients */
hp1ca = fs + 0x003C1; /** The "magic" constant is 1/RC. This filter
* cut-off is approximately 237 Hz
@ -437,7 +456,8 @@ static void compressor_process(struct dsp_proc_entry *this,
struct dsp_buffer *buf = *buf_p;
int count = buf->remcount;
int32_t *in_buf[2] = { buf->p32[0], buf->p32[1] };
const int num_chan = buf->format.num_channels;
const int num_chan = MIN(buf->format.num_channels, MAX_CH);
int32_t (*labufp)[MAX_CH][MAX_DLY] = core_get_data(labuf_handle);
while (count-- > 0)
{
@ -452,7 +472,7 @@ static void compressor_process(struct dsp_proc_entry *this,
{
tmpx = *in_buf[ch];
x += tmpx;
labuf[ch][delay_write] = tmpx;
(*labufp)[ch][delay_write] = tmpx;
/* Limiter detection */
if(tmpx < 0) tmpx = -(tmpx + 1);
if(tmpx > in_buf_max_level) in_buf_max_level = tmpx;
@ -541,7 +561,7 @@ static void compressor_process(struct dsp_proc_entry *this,
{
for (int ch = 0; ch < num_chan; ch++)
{
*in_buf[ch] = FRACMUL_SHL(total_gain, labuf[ch][delay_read], 7);
*in_buf[ch] = FRACMUL_SHL(total_gain, (*labufp)[ch][delay_read], 7);
}
}
in_buf[0]++;
@ -575,13 +595,14 @@ static intptr_t compressor_configure(struct dsp_proc_entry *this,
/* Fall-through */
case DSP_RESET:
case DSP_FLUSH:
{
int32_t (*labufp)[MAX_CH][MAX_DLY] = core_get_data(labuf_handle);
release_gain = UNITY;
for(i=0; i<MAX_CH; i++)
{
for(j=0; j<MAX_DLY; j++)
{
labuf[i][j] = 0; /* All Silence */
(*labufp)[i][j] = 0; /* All Silence */
}
}
@ -599,7 +620,7 @@ static intptr_t compressor_configure(struct dsp_proc_entry *this,
* look-ahead limiter
*/
break;
}
case DSP_SET_OUT_FREQUENCY:
compressor_update(dsp, &curr_set);
break;