diff options
Diffstat (limited to 'audio/filter/af_pan.c')
| -rw-r--r-- | audio/filter/af_pan.c | 210 |
1 files changed, 210 insertions, 0 deletions
diff --git a/audio/filter/af_pan.c b/audio/filter/af_pan.c new file mode 100644 index 0000000000..8b1783ee84 --- /dev/null +++ b/audio/filter/af_pan.c @@ -0,0 +1,210 @@ +/* + * Copyright (C) 2002 Anders Johansson ajh@atri.curtin.edu.au + * + * This file is part of MPlayer. + * + * MPlayer is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * MPlayer is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with MPlayer; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#include <stdio.h> +#include <stdlib.h> + +#include <inttypes.h> +#include <math.h> +#include <limits.h> + +#include "af.h" + +// Data for specific instances of this filter +typedef struct af_pan_s +{ + int nch; // Number of output channels; zero means same as input + float level[AF_NCH][AF_NCH]; // Gain level for each channel +}af_pan_t; + +// Initialization and runtime control +static int control(struct af_instance* af, int cmd, void* arg) +{ + af_pan_t* s = af->setup; + + switch(cmd){ + case AF_CONTROL_REINIT: + // Sanity check + if(!arg) return AF_ERROR; + + af->data->rate = ((struct mp_audio*)arg)->rate; + af->data->format = AF_FORMAT_FLOAT_NE; + af->data->bps = 4; + af->data->nch = s->nch ? s->nch: ((struct mp_audio*)arg)->nch; + af->mul = (double)af->data->nch / ((struct mp_audio*)arg)->nch; + + if((af->data->format != ((struct mp_audio*)arg)->format) || + (af->data->bps != ((struct mp_audio*)arg)->bps)){ + ((struct mp_audio*)arg)->format = af->data->format; + ((struct mp_audio*)arg)->bps = af->data->bps; + return AF_FALSE; + } + return AF_OK; + case AF_CONTROL_COMMAND_LINE:{ + int nch = 0; + int n = 0; + char* cp = NULL; + int j,k; + // Read number of outputs + sscanf((char*)arg,"%i%n", &nch,&n); + if(AF_OK != control(af,AF_CONTROL_PAN_NOUT | AF_CONTROL_SET, &nch)) + return AF_ERROR; + + // Read pan values + cp = &((char*)arg)[n]; + j = 0; k = 0; + while((*cp == ':') && (k < AF_NCH)){ + sscanf(cp, ":%f%n" , &s->level[j][k], &n); + mp_msg(MSGT_AFILTER, MSGL_V, "[pan] Pan level from channel %i to" + " channel %i = %f\n",k,j,s->level[j][k]); + cp =&cp[n]; + j++; + if(j>=nch){ + j = 0; + k++; + } + } + return AF_OK; + } + case AF_CONTROL_PAN_LEVEL | AF_CONTROL_SET:{ + int i; + int ch = ((af_control_ext_t*)arg)->ch; + float* level = ((af_control_ext_t*)arg)->arg; + if (ch >= AF_NCH) + return AF_FALSE; + for(i=0;i<AF_NCH;i++) + s->level[ch][i] = level[i]; + return AF_OK; + } + case AF_CONTROL_PAN_LEVEL | AF_CONTROL_GET:{ + int i; + int ch = ((af_control_ext_t*)arg)->ch; + float* level = ((af_control_ext_t*)arg)->arg; + if (ch >= AF_NCH) + return AF_FALSE; + for(i=0;i<AF_NCH;i++) + level[i] = s->level[ch][i]; + return AF_OK; + } + case AF_CONTROL_PAN_NOUT | 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){ + mp_msg(MSGT_AFILTER, MSGL_ERR, "[pan] The number of output channels must be" + " between 1 and %i. Current value is %i\n",AF_NCH,((int*)arg)[0]); + return AF_ERROR; + } + s->nch=((int*)arg)[0]; + return AF_OK; + case AF_CONTROL_PAN_NOUT | AF_CONTROL_GET: + *(int*)arg = af->data->nch; + return AF_OK; + case AF_CONTROL_PAN_BALANCE | AF_CONTROL_SET:{ + float val = *(float*)arg; + if (s->nch) + return AF_ERROR; + if (af->data->nch >= 2) { + s->level[0][0] = min(1.f, 1.f - val); + s->level[0][1] = max(0.f, val); + s->level[1][0] = max(0.f, -val); + s->level[1][1] = min(1.f, 1.f + val); + } + return AF_OK; + } + case AF_CONTROL_PAN_BALANCE | AF_CONTROL_GET: + if (s->nch) + return AF_ERROR; + *(float*)arg = s->level[0][1] - s->level[1][0]; + return AF_OK; + } + return AF_UNKNOWN; +} + +// Deallocate memory +static void uninit(struct af_instance* af) +{ + if(af->data) + free(af->data->audio); + free(af->data); + free(af->setup); +} + +// Filter data through filter +static struct mp_audio* play(struct af_instance* af, struct mp_audio* data) +{ + struct mp_audio* c = data; // Current working data + struct mp_audio* l = af->data; // Local data + af_pan_t* s = af->setup; // Setup for this instance + float* in = c->audio; // Input audio data + float* out = NULL; // Output audio data + float* end = in+c->len/4; // End of loop + int nchi = c->nch; // Number of input channels + int ncho = l->nch; // Number of output channels + register int j,k; + + if(AF_OK != RESIZE_LOCAL_BUFFER(af,data)) + return NULL; + + out = l->audio; + // Execute panning + // FIXME: Too slow + while(in < end){ + for(j=0;j<ncho;j++){ + register float x = 0.0; + register float* tin = in; + for(k=0;k<nchi;k++) + x += tin[k] * s->level[j][k]; + out[j] = x; + } + out+= ncho; + in+= nchi; + } + + // Set output data + c->audio = l->audio; + c->len = c->len / c->nch * l->nch; + c->nch = l->nch; + + return c; +} + +// Allocate memory and set function pointers +static int af_open(struct af_instance* af){ + af->control=control; + af->uninit=uninit; + af->play=play; + af->mul=1; + af->data=calloc(1,sizeof(struct mp_audio)); + af->setup=calloc(1,sizeof(af_pan_t)); + if(af->data == NULL || af->setup == NULL) + return AF_ERROR; + return AF_OK; +} + +// Description of this filter +struct af_info af_info_pan = { + "Panning audio filter", + "pan", + "Anders", + "", + AF_FLAGS_REENTRANT, + af_open +}; |