mirror of
https://github.com/mpv-player/mpv
synced 2024-12-16 11:55:42 +00:00
66f4e56389
-- Support for runtime cpu detection -- Stand alone compile of libaf -- Unlimited number of channels (compiletime switch) -- Sample format defined by bit-fields -- New formats: float, A-Law and mu-law -- Format conversion set in human readable format i.e. format=4:us_be to set 32 bit unsigned big endian output -- Format reporting in human readable format -- Volume control has only one parameter for setting the volume i.e. volume=-10.0:1:0:1 to set atenuation = -10dB git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@8168 b3059339-0415-0410-9bf9-f77b7e298cf2
177 lines
4.1 KiB
C
177 lines
4.1 KiB
C
/* Audio filter that adds and removes channels, according to the
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command line parameter channels. It is stupid and can only add
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silence or copy channels not mix or filter.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <inttypes.h>
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#include "af.h"
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// Local function for copying data
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void copy(void* in, void* out, int ins, int inos,int outs, int outos, int len, int bps)
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{
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switch(bps){
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case 1:{
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int8_t* tin = (int8_t*)in;
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int8_t* tout = (int8_t*)out;
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tin += inos;
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tout += outos;
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len = len/ins;
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while(len--){
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*tout=*tin;
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tin +=ins;
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tout+=outs;
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}
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break;
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}
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case 2:{
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int16_t* tin = (int16_t*)in;
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int16_t* tout = (int16_t*)out;
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tin += inos;
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tout += outos;
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len = len/(2*ins);
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while(len--){
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*tout=*tin;
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tin +=ins;
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tout+=outs;
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}
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break;
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}
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case 4:{
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int32_t* tin = (int32_t*)in;
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int32_t* tout = (int32_t*)out;
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tin += inos;
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tout += outos;
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len = len/(4*ins);
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while(len--){
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*tout=*tin;
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tin +=ins;
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tout+=outs;
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}
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break;
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}
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case 8:{
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int64_t* tin = (int64_t*)in;
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int64_t* tout = (int64_t*)out;
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tin += inos;
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tout += outos;
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len = len/(8*ins);
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while(len--){
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*tout=*tin;
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tin +=ins;
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tout+=outs;
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}
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break;
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}
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default:
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af_msg(AF_MSG_ERROR,"[channels] Unsupported number of bytes/sample: %i please report this error on the MPlayer mailing list. \n",bps);
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}
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}
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// Initialization and runtime control
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static int control(struct af_instance_s* af, int cmd, void* arg)
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{
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switch(cmd){
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case AF_CONTROL_REINIT:
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// Make sure this filter isn't redundant
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if(af->data->nch == ((af_data_t*)arg)->nch)
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return AF_DETACH;
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af->data->rate = ((af_data_t*)arg)->rate;
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af->data->format = ((af_data_t*)arg)->format;
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af->data->bps = ((af_data_t*)arg)->bps;
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af->mul.n = af->data->nch;
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af->mul.d = ((af_data_t*)arg)->nch;
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return AF_OK;
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case AF_CONTROL_COMMAND_LINE:{
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int nch = 0;
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sscanf((char*)arg,"%i",&nch);
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return af->control(af,AF_CONTROL_CHANNELS,&nch);
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}
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case AF_CONTROL_CHANNELS:
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// Reinit must be called after this function has been called
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// Sanity check
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if(((int*)arg)[0] <= 0 || ((int*)arg)[0] > 6){
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af_msg(AF_MSG_ERROR,"[channels] The number of output channels must be between 1 and 6. Current value is%i \n",((int*)arg)[0]);
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return AF_ERROR;
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}
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af->data->nch=((int*)arg)[0];
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af_msg(AF_MSG_VERBOSE,"[channels] Changing number of channels to %i\n",af->data->nch);
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return AF_OK;
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}
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return AF_UNKNOWN;
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}
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// Deallocate memory
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static void uninit(struct af_instance_s* af)
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{
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if(af->data)
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free(af->data);
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}
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// Filter data through filter
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static af_data_t* play(struct af_instance_s* af, af_data_t* data)
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{
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af_data_t* c = data; // Current working data
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af_data_t* l = af->data; // Local data
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if(AF_OK != RESIZE_LOCAL_BUFFER(af,data))
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return NULL;
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// Reset unused channels if nch in < nch out
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if(af->mul.n > af->mul.d)
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memset(l->audio,0,(c->len*af->mul.n)/af->mul.d);
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// Special case always output L & R
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if(c->nch == 1){
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copy(c->audio,l->audio,1,0,l->nch,0,c->len,c->bps);
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copy(c->audio,l->audio,1,0,l->nch,1,c->len,c->bps);
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}
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else{
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int i;
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if(l->nch < c->nch){
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for(i=0;i<l->nch;i++) // Truncates R if l->nch == 1 not good need mixing
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copy(c->audio,l->audio,c->nch,i,l->nch,i,c->len,c->bps);
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}
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else{
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for(i=0;i<c->nch;i++)
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copy(c->audio,l->audio,c->nch,i,l->nch,i,c->len,c->bps);
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}
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}
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// Set output data
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c->audio = l->audio;
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c->len = (c->len*af->mul.n)/af->mul.d;
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c->nch = l->nch;
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return c;
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}
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// Allocate memory and set function pointers
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static int open(af_instance_t* af){
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af->control=control;
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af->uninit=uninit;
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af->play=play;
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af->mul.n=1;
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af->mul.d=1;
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af->data=calloc(1,sizeof(af_data_t));
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if(af->data == NULL)
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return AF_ERROR;
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return AF_OK;
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}
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// Description of this filter
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af_info_t af_info_channels = {
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"Insert or remove channels",
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"channels",
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"Anders",
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"",
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AF_FLAGS_REENTRANT,
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open
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};
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