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cc_vanilla.c
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cc_vanilla.c
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/*
* FILE: cc_vanilla.c
* AUTHOR(S): Orion Hodson
*
*
* Copyright (c) 1999-2001 University College London
* All rights reserved.
*/
#ifndef HIDE_SOURCE_STRINGS
static const char cvsid[] =
"$Id: cc_vanilla.c 3663 2004-10-09 09:31:09Z ucaccsp $";
#endif /* HIDE_SOURCE_STRINGS */
#include "config_unix.h"
#include "config_win32.h"
#include "audio_types.h"
#include "codec_types.h"
#include "codec.h"
#include "channel_types.h"
#include "playout.h"
#include "cc_vanilla.h"
#include "memory.h"
#include "util.h"
#include "debug.h"
typedef struct {
/* Encoder state is just buffering of media data to compose a packet */
codec_id_t codec_id;
timestamp_t playout;
uint32_t nelem;
media_data *elem[MAX_UNITS_PER_PACKET];
} ve_state;
int
vanilla_encoder_create(u_char **state, uint32_t *len)
{
ve_state *ve = (ve_state*)xmalloc(sizeof(ve_state));
if (ve) {
*state = (u_char*)ve;
*len = sizeof(ve_state);
memset(ve, 0, sizeof(ve_state));
return TRUE;
}
return FALSE;
}
void
vanilla_encoder_destroy(u_char **state, uint32_t len)
{
assert(len == sizeof(ve_state));
vanilla_encoder_reset(*state);
xfree(*state);
*state = NULL;
}
int
vanilla_encoder_reset(u_char *state)
{
ve_state *ve = (ve_state*)state;
uint32_t i;
for(i = 0; i < ve->nelem; i++) {
media_data_destroy(&ve->elem[i], sizeof(media_data));
}
ve->nelem = 0;
return TRUE;
}
/* vanilla_encoder_output transfers media data into channel_unit */
static void
vanilla_encoder_output(ve_state *ve, struct s_pb *out)
{
uint32_t i, used;
channel_data *cd;
/* We have state for first unit and data for all others */
channel_data_create(&cd, ve->nelem + 1);
/* Fill in payload */
cd->elem[0]->pt = codec_get_payload(ve->codec_id);
used = 0;
/* Get state for first unit if there */
if (ve->elem[0]->rep[0]->state) {
cd->elem[0]->data = ve->elem[0]->rep[0]->state;
cd->elem[0]->data_len = ve->elem[0]->rep[0]->state_len;
ve->elem[0]->rep[0]->state = NULL;
ve->elem[0]->rep[0]->state_len = 0;
used++;
}
/* Transfer coded data to channel_data */
for(i = 0; i < ve->nelem; i++) {
cd->elem[used]->data = ve->elem[i]->rep[0]->data;
cd->elem[used]->data_len = ve->elem[i]->rep[0]->data_len;
ve->elem[i]->rep[0]->data = NULL;
ve->elem[i]->rep[0]->data_len = 0;
used++;
media_data_destroy(&ve->elem[i], sizeof(media_data));
}
ve->nelem = 0;
assert(used <= cd->nelem);
pb_add(out,
(u_char*)cd,
sizeof(channel_data),
ve->playout);
}
int
vanilla_encoder_encode (u_char *state,
struct s_pb *in,
struct s_pb *out,
uint32_t upp)
{
uint32_t m_len;
timestamp_t playout;
struct s_pb_iterator *pi;
u_char *m_get;
media_data *m;
ve_state *ve = (ve_state*)state;
assert(upp != 0 && upp <= MAX_UNITS_PER_PACKET);
pb_iterator_create(in, &pi);
pb_iterator_advance(pi); /* Move to first element */
while(pb_iterator_detach_at(pi, &m_get, &m_len, &playout)) {
/* Remove element from playout buffer - it belongs to
* the vanilla encoder now.
*/
m = (media_data*)m_get;
assert(m != NULL);
if (ve->nelem == 0) {
/* If it's the first unit make a note of it's
* playout */
ve->playout = playout;
if (m->nrep == 0) {
/* We have no data ready to go and no data
* came off on incoming queue.
*/
media_data_destroy(&m, sizeof(media_data));
continue;
}
} else {
/* Check for early send required:
* (a) if this unit has no media respresentations
* e.g. end of talkspurt.
* (b) codec type of incoming unit is different
* from what is on queue.
*/
if (m->nrep == 0) {
vanilla_encoder_output(ve, out);
media_data_destroy(&m, sizeof(media_data));
continue;
} else if (m->rep[0]->id != ve->codec_id) {
vanilla_encoder_output(ve, out);
}
}
assert(m_len == sizeof(media_data));
ve->codec_id = m->rep[0]->id;
ve->elem[ve->nelem] = m;
ve->nelem++;
if (ve->nelem >= (uint32_t)upp) {
vanilla_encoder_output(ve, out);
}
}
pb_iterator_destroy(in, &pi);
return TRUE;
}
static void
vanilla_decoder_output(channel_unit *cu, struct s_pb *out, timestamp_t playout)
{
const codec_format_t *cf;
codec_id_t id;
uint32_t data_len;
u_char *p, *end;
media_data *m;
timestamp_t unit_dur;
id = codec_get_by_payload(cu->pt);
cf = codec_get_format(id);
unit_dur = ts_map32(cf->format.sample_rate, codec_get_samples_per_frame(id));
p = cu->data;
end = cu->data + cu->data_len;
while(p < end) {
media_data_create(&m, 1);
m->rep[0]->id = id;
if (p == cu->data && cf->mean_per_packet_state_size) {
/* First unit out of packet may have state */
m->rep[0]->state_len = cf->mean_per_packet_state_size;
m->rep[0]->state = (u_char*)block_alloc(m->rep[0]->state_len);
memcpy(m->rep[0]->state, p, cf->mean_per_packet_state_size);
p += cf->mean_per_packet_state_size;
}
/* Now do data section */
data_len = codec_peek_frame_size(id, p, (uint16_t)(end - p));
m->rep[0]->data = (u_char*)block_alloc(data_len);
m->rep[0]->data_len = (uint16_t)data_len;
memcpy(m->rep[0]->data, p, data_len);
if (pb_add(out, (u_char *)m, sizeof(media_data), playout) == FALSE) {
debug_msg("Vanilla decode failed\n");
media_data_destroy(&m, sizeof(media_data));
return;
}
p += data_len;
playout = ts_add(playout, unit_dur);
}
assert(p == end);
}
int
vanilla_decoder_decode(u_char *state,
struct s_pb *in,
struct s_pb *out,
timestamp_t now)
{
struct s_pb_iterator *pi;
channel_unit *cu;
u_char *c_get;
channel_data *c;
uint32_t clen;
timestamp_t playout;
assert(state == NULL); /* No decoder state needed */
UNUSED(state);
pb_iterator_create(in, &pi);
assert(pi != NULL);
while(pb_iterator_get_at(pi, &c_get, &clen, &playout)) {
c = (channel_data*)c_get;
assert(c != NULL);
assert(clen == sizeof(channel_data));
if (ts_gt(playout, now)) {
/* Playout point of unit is after now. Stop! */
break;
}
pb_iterator_detach_at(pi, &c_get, &clen, &playout);
c = (channel_data*)c_get;
assert(c != NULL);
assert(c->nelem == 1);
cu = c->elem[0];
vanilla_decoder_output(cu, out, playout);
channel_data_destroy(&c, sizeof(channel_data));
}
pb_iterator_destroy(in, &pi);
return TRUE;
}
int
vanilla_decoder_peek(uint8_t pkt_pt,
u_char *buf,
uint32_t len,
uint16_t *upp,
uint8_t *pt)
{
codec_id_t cid;
assert(buf != NULL);
assert(upp != NULL);
assert(pt != NULL);
cid = codec_get_by_payload(pkt_pt);
if (cid) {
const codec_format_t *cf;
uint32_t unit, done, step;
/* Vanilla coding does nothing but group
* units.
*/
cf = codec_get_format(cid);
unit = 0;
done = cf->mean_per_packet_state_size;
while(done < len) {
step = codec_peek_frame_size(cid, buf+done, (uint16_t)(len - done));
if (step == 0) {
debug_msg("Zero data len for audio unit ?\n");
goto fail;
}
done += step;
unit ++;
}
assert(done >= len);
if (done != len) goto fail;
*upp = (uint16_t)unit;
*pt = pkt_pt;
return TRUE;
}
fail:
*upp = 0;
*pt = 255;
return FALSE;
}
int
vanilla_decoder_describe (uint8_t pkt_pt,
u_char *data,
uint32_t data_len,
char *out,
uint32_t out_len)
{
codec_id_t pri_id;
const codec_format_t *pri_cf;
pri_id = codec_get_by_payload(pkt_pt);
if (pri_id) {
pri_cf = codec_get_format(pri_id);
strncpy(out, pri_cf->long_name, out_len);
} else {
strncpy(out, "Unknown", out_len);
}
/* string safety - strncpy not always safe */
out[out_len - 1] = '\0';
UNUSED(data);
UNUSED(data_len);
return TRUE;
}