mpv/libaf/af_channels.c

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/* Audio filter that adds and removes channels, according to the
command line parameter channels. It is stupid and can only add
silence or copy channels not mix or filter.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <inttypes.h>
#include "af.h"
#define FR 0
#define TO 1
typedef struct af_channels_s{
int route[AF_NCH][2];
int nr;
int router;
}af_channels_t;
// Local function for copying data
static void copy(void* in, void* out, int ins, int inos,int outs, int outos, int len, int bps)
{
switch(bps){
case 1:{
int8_t* tin = (int8_t*)in;
int8_t* tout = (int8_t*)out;
tin += inos;
tout += outos;
len = len/ins;
while(len--){
*tout=*tin;
tin +=ins;
tout+=outs;
}
break;
}
case 2:{
int16_t* tin = (int16_t*)in;
int16_t* tout = (int16_t*)out;
tin += inos;
tout += outos;
len = len/(2*ins);
while(len--){
*tout=*tin;
tin +=ins;
tout+=outs;
}
break;
}
case 4:{
int32_t* tin = (int32_t*)in;
int32_t* tout = (int32_t*)out;
tin += inos;
tout += outos;
len = len/(4*ins);
while(len--){
*tout=*tin;
tin +=ins;
tout+=outs;
}
break;
}
case 8:{
int64_t* tin = (int64_t*)in;
int64_t* tout = (int64_t*)out;
tin += inos;
tout += outos;
len = len/(8*ins);
while(len--){
*tout=*tin;
tin +=ins;
tout+=outs;
}
break;
}
default:
af_msg(AF_MSG_ERROR,"[channels] Unsupported number of bytes/sample: %i"
" please report this error on the MPlayer mailing list. \n",bps);
}
}
// Make sure the routes are sane
static int check_routes(af_channels_t* s, int nin, int nout)
{
int i;
if((s->nr < 1) || (s->nr > AF_NCH)){
af_msg(AF_MSG_ERROR,"[channels] The number of routing pairs must be"
" between 1 and %i. Current value is %i\n",AF_NCH,s->nr);
return AF_ERROR;
}
for(i=0;i<s->nr;i++){
if((s->route[i][FR] >= nin) || (s->route[i][TO] >= nout)){
af_msg(AF_MSG_ERROR,"[channels] Invalid routing in pair nr. %i.\n", i);
return AF_ERROR;
}
}
return AF_OK;
}
// Initialization and runtime control
static int control(struct af_instance_s* af, int cmd, void* arg)
{
af_channels_t* s = af->setup;
switch(cmd){
case AF_CONTROL_REINIT:
// Set default channel assignment
if(!s->router){
int i;
// Make sure this filter isn't redundant
if(af->data->nch == ((af_data_t*)arg)->nch)
return AF_DETACH;
// If mono: fake stereo
if(((af_data_t*)arg)->nch == 1){
s->nr = min(af->data->nch,2);
for(i=0;i<s->nr;i++){
s->route[i][FR] = 0;
s->route[i][TO] = i;
}
}
else{
s->nr = min(af->data->nch, ((af_data_t*)arg)->nch);
for(i=0;i<s->nr;i++){
s->route[i][FR] = i;
s->route[i][TO] = i;
}
}
}
af->data->rate = ((af_data_t*)arg)->rate;
af->data->format = ((af_data_t*)arg)->format;
af->data->bps = ((af_data_t*)arg)->bps;
af->mul.n = af->data->nch;
af->mul.d = ((af_data_t*)arg)->nch;
return check_routes(s,((af_data_t*)arg)->nch,af->data->nch);
case AF_CONTROL_COMMAND_LINE:{
int nch = 0;
int n = 0;
// Check number of channels and number of routing pairs
sscanf(arg, "%i:%i%n", &nch, &s->nr, &n);
// If router scan commandline for routing pairs
if(s->nr){
char* cp = &((char*)arg)[n];
int ch = 0;
// Sanity check
if((s->nr < 1) || (s->nr > AF_NCH)){
af_msg(AF_MSG_ERROR,"[channels] The number of routing pairs must be"
" between 1 and %i. Current value is %i\n",AF_NCH,s->nr);
}
s->router = 1;
// Scan for pairs on commandline
while((*cp == ':') && (ch < s->nr)){
sscanf(cp, ":%i:%i%n" ,&s->route[ch][FR], &s->route[ch][TO], &n);
af_msg(AF_MSG_VERBOSE,"[channels] Routing from channel %i to"
" channel %i\n",s->route[ch][FR],s->route[ch][TO]);
cp = &cp[n];
ch++;
}
}
if(AF_OK != af->control(af,AF_CONTROL_CHANNELS | AF_CONTROL_SET ,&nch))
return AF_ERROR;
return AF_OK;
}
case AF_CONTROL_CHANNELS | AF_CONTROL_SET:
// Reinit must be called after this function has been called
// Sanity check
if(((int*)arg)[0] <= 0 || ((int*)arg)[0] > AF_NCH){
af_msg(AF_MSG_ERROR,"[channels] The number of output channels must be"
" between 1 and %i. Current value is %i\n",AF_NCH,((int*)arg)[0]);
return AF_ERROR;
}
af->data->nch=((int*)arg)[0];
if(!s->router)
af_msg(AF_MSG_VERBOSE,"[channels] Changing number of channels"
" to %i\n",af->data->nch);
return AF_OK;
case AF_CONTROL_CHANNELS | AF_CONTROL_GET:
*(int*)arg = af->data->nch;
return AF_OK;
case AF_CONTROL_CHANNELS_ROUTING | AF_CONTROL_SET:{
int ch = ((af_control_ext_t*)arg)->ch;
int* route = ((af_control_ext_t*)arg)->arg;
s->route[ch][FR] = route[FR];
s->route[ch][TO] = route[TO];
return AF_OK;
}
case AF_CONTROL_CHANNELS_ROUTING | AF_CONTROL_GET:{
int ch = ((af_control_ext_t*)arg)->ch;
int* route = ((af_control_ext_t*)arg)->arg;
route[FR] = s->route[ch][FR];
route[TO] = s->route[ch][TO];
return AF_OK;
}
case AF_CONTROL_CHANNELS_NR | AF_CONTROL_SET:
s->nr = *(int*)arg;
return AF_OK;
case AF_CONTROL_CHANNELS_NR | AF_CONTROL_GET:
*(int*)arg = s->nr;
return AF_OK;
case AF_CONTROL_CHANNELS_ROUTER | AF_CONTROL_SET:
s->router = *(int*)arg;
return AF_OK;
case AF_CONTROL_CHANNELS_ROUTER | AF_CONTROL_GET:
*(int*)arg = s->router;
return AF_OK;
}
return AF_UNKNOWN;
}
// Deallocate memory
static void uninit(struct af_instance_s* af)
{
if(af->setup)
free(af->setup);
if(af->data)
free(af->data);
}
// Filter data through filter
static af_data_t* play(struct af_instance_s* af, af_data_t* data)
{
af_data_t* c = data; // Current working data
af_data_t* l = af->data; // Local data
af_channels_t* s = af->setup;
int i;
if(AF_OK != RESIZE_LOCAL_BUFFER(af,data))
return NULL;
// Reset unused channels
memset(l->audio,0,(c->len*af->mul.n)/af->mul.d);
if(AF_OK == check_routes(s,c->nch,l->nch))
for(i=0;i<s->nr;i++)
copy(c->audio,l->audio,c->nch,s->route[i][FR],
l->nch,s->route[i][TO],c->len,c->bps);
// Set output data
c->audio = l->audio;
c->len = (c->len*af->mul.n)/af->mul.d;
c->nch = l->nch;
return c;
}
// Allocate memory and set function pointers
static int open(af_instance_t* af){
af->control=control;
af->uninit=uninit;
af->play=play;
af->mul.n=1;
af->mul.d=1;
af->data=calloc(1,sizeof(af_data_t));
af->setup=calloc(1,sizeof(af_channels_t));
if((af->data == NULL) || (af->setup == NULL))
return AF_ERROR;
return AF_OK;
}
// Description of this filter
af_info_t af_info_channels = {
"Insert or remove channels",
"channels",
"Anders",
"",
AF_FLAGS_REENTRANT,
open
};