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-rwxr-xr-xcodecs/codec_adpcm.c91
-rwxr-xr-xformats/format_vox.c69
2 files changed, 112 insertions, 48 deletions
diff --git a/codecs/codec_adpcm.c b/codecs/codec_adpcm.c
index 584538367..28e4a2794 100755
--- a/codecs/codec_adpcm.c
+++ b/codecs/codec_adpcm.c
@@ -27,6 +27,7 @@
#include <unistd.h>
#define BUFFER_SIZE 8096 /* size for the translation buffers */
+#define BUF_SHIFT 5
static ast_mutex_t localuser_lock = AST_MUTEX_INITIALIZER;
static int localusecnt = 0;
@@ -77,21 +78,48 @@ static short nbl2bit[16][4] = {
* Sets the index to the step size table for the next encode.
*/
-static inline short
-decode (unsigned char encoded, short *ssindex)
+static inline void
+decode (unsigned char encoded, short *ssindex, short *signal, unsigned char *rkey, unsigned char *next)
{
short diff, step;
step = stpsz[*ssindex];
- diff = nbl2bit[encoded][0] * (step * nbl2bit[encoded][1] +
- (step >> 1) * nbl2bit[encoded][2] +
- (step >> 2) * nbl2bit[encoded][3] +
- (step >> 3));
+
+ diff = step * nbl2bit[encoded][1] +
+ (step >> 1) * nbl2bit[encoded][2] +
+ (step >> 2) * nbl2bit[encoded][3] +
+ (step >> 3);
+ if (nbl2bit[encoded][2] && (step & 0x1))
+ diff++;
+ diff *= nbl2bit[encoded][0];
+
+ if ( *next & 0x1 )
+ *signal -= 8;
+ else if ( *next & 0x2 )
+ *signal += 8;
+
+ *signal += diff;
+
+ if (*signal > 2047)
+ *signal = 2047;
+ else if (*signal < -2047)
+ *signal = -2047;
+
+ *next = 0;
+ if( encoded & 0x7 )
+ *rkey = 0;
+ else if ( ++(*rkey) == 24 ) {
+ *rkey = 0;
+ if (*signal > 0)
+ *next = 0x1;
+ else if (*signal < 0)
+ *next = 0x2;
+ }
+
*ssindex = *ssindex + indsft[(encoded & 7)];
if (*ssindex < 0)
*ssindex = 0;
else if (*ssindex > 48)
*ssindex = 48;
- return (diff);
}
/*
@@ -107,7 +135,7 @@ decode (unsigned char encoded, short *ssindex)
*/
static inline unsigned char
-adpcm (short csig, short *ssindex, short *signal)
+adpcm (short csig, short *ssindex, short *signal, unsigned char *rkey, unsigned char *next)
{
short diff, step;
unsigned char encoded;
@@ -142,7 +170,7 @@ adpcm (short csig, short *ssindex, short *signal)
if (diff >= step)
encoded |= 1;
- *signal += decode (encoded, ssindex);
+ decode (encoded, ssindex, signal, rkey, next);
return (encoded);
}
@@ -158,6 +186,8 @@ struct adpcm_encoder_pvt
unsigned char outbuf[BUFFER_SIZE]; /* Encoded ADPCM, two nibbles to a word */
short ssindex;
short signal;
+ unsigned char zero_count;
+ unsigned char next_flag;
int tail;
};
@@ -245,13 +275,15 @@ adpcmtolin_framein (struct ast_translator_pvt *pvt, struct ast_frame *f)
short signal;
short ssindex;
unsigned char *b;
+ unsigned char zero_count;
+ unsigned char next_flag;
- if (f->datalen < 3) {
- ast_log(LOG_WARNING, "Didn't have at least three bytes of input\n");
+ if (f->datalen < BUF_SHIFT) {
+ ast_log(LOG_WARNING, "Didn't have at least %d bytes of input\n", BUF_SHIFT);
return -1;
}
- if ((f->datalen - 3) * 4 > sizeof(tmp->outbuf)) {
+ if ((f->datalen - BUF_SHIFT) * 4 > sizeof(tmp->outbuf)) {
ast_log(LOG_WARNING, "Out of buffer space\n");
return -1;
}
@@ -265,20 +297,16 @@ adpcmtolin_framein (struct ast_translator_pvt *pvt, struct ast_frame *f)
ssindex = 48;
signal = (b[1] << 8) | b[2];
-
- for (x=3;x<f->datalen;x++) {
- signal += decode(b[x] >> 4, &ssindex);
- if (signal > 2047)
- signal = 2047;
- if (signal < -2048)
- signal = -2048;
- tmp->outbuf[tmp->tail++] = signal << 4;
- signal += decode(b[x] & 0x0f, &ssindex);
- if (signal > 2047)
- signal = 2047;
- if (signal < -2048)
- signal = -2048;
- tmp->outbuf[tmp->tail++] = signal << 4;
+
+ zero_count = b[3];
+ next_flag = b[4];
+
+ for (x=BUF_SHIFT;x<f->datalen;x++) {
+ decode((b[x] >> 4) & 0xf, &ssindex, &signal, &zero_count, &next_flag);
+ tmp->outbuf[tmp->tail++] = signal << 4;
+
+ decode(b[x] & 0x0f, &ssindex, &signal, &zero_count, &next_flag);
+ tmp->outbuf[tmp->tail++] = signal << 4;
}
return 0;
@@ -372,12 +400,15 @@ lintoadpcm_frameout (struct ast_translator_pvt *pvt)
tmp->outbuf[0] = tmp->ssindex & 0xff;
tmp->outbuf[1] = (tmp->signal >> 8) & 0xff;
tmp->outbuf[2] = (tmp->signal & 0xff);
+ tmp->outbuf[3] = tmp->zero_count;
+ tmp->outbuf[4] = tmp->next_flag;
for (i = 0; i < i_max; i+=2)
{
- adpcm0 = adpcm(tmp->inbuf[i], &tmp->ssindex, &tmp->signal);
- adpcm1 = adpcm(tmp->inbuf[i+1], &tmp->ssindex, &tmp->signal);
- tmp->outbuf[i/2 + 3] = (adpcm0 << 4) | adpcm1;
+ adpcm0 = adpcm (tmp->inbuf[i], &tmp->ssindex, &tmp->signal, &tmp->zero_count, &tmp->next_flag);
+ adpcm1 = adpcm (tmp->inbuf[i+1], &tmp->ssindex, &tmp->signal, &tmp->zero_count, &tmp->next_flag);
+
+ tmp->outbuf[i/2 + BUF_SHIFT] = (adpcm0 << 4) | adpcm1;
};
@@ -388,7 +419,7 @@ lintoadpcm_frameout (struct ast_translator_pvt *pvt)
tmp->f.offset = AST_FRIENDLY_OFFSET;
tmp->f.src = __PRETTY_FUNCTION__;
tmp->f.data = tmp->outbuf;
- tmp->f.datalen = i_max / 2 + 3;
+ tmp->f.datalen = i_max / 2 + BUF_SHIFT;
/*
* If there is a signal left over (there should be no more than
diff --git a/formats/format_vox.c b/formats/format_vox.c
index 45ba749fb..4fd7ffd94 100755
--- a/formats/format_vox.c
+++ b/formats/format_vox.c
@@ -33,6 +33,7 @@
#endif
#define BUF_SIZE 80 /* 160 samples */
+#define BUF_SHIFT 5
struct ast_filestream {
void *reserved[AST_RESERVED_POINTERS];
@@ -41,11 +42,13 @@ struct ast_filestream {
struct ast_frame fr; /* Frame information */
char waste[AST_FRIENDLY_OFFSET]; /* Buffer for sending frames, etc */
char empty; /* Empty character */
- unsigned char buf[BUF_SIZE + 3]; /* Output Buffer */
+ unsigned char buf[BUF_SIZE + BUF_SHIFT]; /* Output Buffer */
int lasttimeout;
struct timeval last;
short signal; /* Signal level (file side) */
short ssindex; /* Signal ssindex (file side) */
+ unsigned char zero_count; /* counter of consecutive zero samples */
+ unsigned char next_flag;
};
@@ -95,21 +98,48 @@ static short nbl2bit[16][4] = {
* Sets the index to the step size table for the next encode.
*/
-static inline short
-decode (unsigned char encoded, short *ssindex)
+static inline void
+decode (unsigned char encoded, short *ssindex, short *signal, unsigned char *rkey, unsigned char *next)
{
short diff, step;
step = stpsz[*ssindex];
- diff = nbl2bit[encoded][0] * (step * nbl2bit[encoded][1] +
- (step >> 1) * nbl2bit[encoded][2] +
- (step >> 2) * nbl2bit[encoded][3] +
- (step >> 3));
+
+ diff = step * nbl2bit[encoded][1] +
+ (step >> 1) * nbl2bit[encoded][2] +
+ (step >> 2) * nbl2bit[encoded][3] +
+ (step >> 3);
+ if (nbl2bit[encoded][2] && (step & 0x1))
+ diff++;
+ diff *= nbl2bit[encoded][0];
+
+ if ( *next & 0x1 )
+ *signal -= 8;
+ else if ( *next & 0x2 )
+ *signal += 8;
+
+ *signal += diff;
+
+ if (*signal > 2047)
+ *signal = 2047;
+ else if (*signal < -2047)
+ *signal = -2047;
+
+ *next = 0;
+ if( encoded & 0x7 )
+ *rkey = 0;
+ else if ( ++(*rkey) == 24 ) {
+ *rkey = 0;
+ if (*signal > 0)
+ *next = 0x1;
+ else if (*signal < 0)
+ *next = 0x2;
+ }
+
*ssindex = *ssindex + indsft[(encoded & 7)];
if (*ssindex < 0)
*ssindex = 0;
else if (*ssindex > 48)
*ssindex = 48;
- return (diff);
}
/*
@@ -129,6 +159,7 @@ adpcm (short csig, short *ssindex, short *signal)
{
short diff, step;
unsigned char encoded;
+ unsigned char zero_count, next_flag;
step = stpsz[*ssindex];
/*
* Clip csig if too large or too small
@@ -160,7 +191,8 @@ adpcm (short csig, short *ssindex, short *signal)
if (diff >= step)
encoded |= 1;
- *signal += decode (encoded, ssindex);
+ decode (encoded, ssindex, signal, &zero_count, &next_flag);
+
return (encoded);
}
@@ -233,13 +265,12 @@ static struct ast_frame *vox_read(struct ast_filestream *s, int *whennext)
int res;
int x;
/* Send a frame from the file to the appropriate channel */
-
s->fr.frametype = AST_FRAME_VOICE;
s->fr.subclass = AST_FORMAT_ADPCM;
s->fr.offset = AST_FRIENDLY_OFFSET;
s->fr.mallocd = 0;
s->fr.data = s->buf;
- if ((res = read(s->fd, s->buf + 3, BUF_SIZE)) < 1) {
+ if ((res = read(s->fd, s->buf + BUF_SHIFT, BUF_SIZE)) < 1) {
if (res)
ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno));
return NULL;
@@ -248,13 +279,15 @@ static struct ast_frame *vox_read(struct ast_filestream *s, int *whennext)
s->buf[0] = s->ssindex & 0xff;
s->buf[1] = (s->signal >> 8) & 0xff;
s->buf[2] = s->signal & 0xff;
+ s->buf[3] = s->zero_count;
+ s->buf[4] = s->next_flag;
/* Do the decoder to be sure we get the right stuff in the signal and index fields. */
- for (x=3;x<res+3;x++) {
- s->signal += decode(s->buf[x] >> 4, &s->ssindex);
- s->signal += decode(s->buf[x] & 0xf, &s->ssindex);
+ for (x=BUF_SHIFT;x<res+BUF_SHIFT;x++) {
+ decode (s->buf[x] >> 4, &s->ssindex, &s->signal, &s->zero_count, &s->next_flag);
+ decode (s->buf[x] & 0xf, &s->ssindex, &s->signal, &s->zero_count, &s->next_flag);
}
s->fr.samples = res * 2;
- s->fr.datalen = res + 3;
+ s->fr.datalen = res + BUF_SHIFT;
*whennext = s->fr.samples;
return &s->fr;
}
@@ -270,11 +303,11 @@ static int vox_write(struct ast_filestream *fs, struct ast_frame *f)
ast_log(LOG_WARNING, "Asked to write non-ADPCM frame (%d)!\n", f->subclass);
return -1;
}
- if (f->datalen < 3) {
- ast_log(LOG_WARNING, "Invalid frame of data (< 3 bytes long) from %s\n", f->src);
+ if (f->datalen < BUF_SHIFT) {
+ ast_log(LOG_WARNING, "Invalid frame of data (< %d bytes long) from %s\n", BUF_SHIFT, f->src);
return -1;
}
- if ((res = write(fs->fd, f->data + 3, f->datalen - 3)) != f->datalen - 3) {
+ if ((res = write(fs->fd, f->data + BUF_SHIFT, f->datalen - BUF_SHIFT)) != f->datalen - BUF_SHIFT) {
ast_log(LOG_WARNING, "Bad write (%d/%d): %s\n", res, f->datalen, strerror(errno));
return -1;
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-01 06:38:56 +0000