mirror of
https://github.com/mpv-player/mpv
synced 2024-12-24 15:52:25 +00:00
8e2dea5f21
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@16983 b3059339-0415-0410-9bf9-f77b7e298cf2
268 lines
6.9 KiB
C
268 lines
6.9 KiB
C
/* This audio filter exports the incomming signal to other processes
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using memory mapping. Memory mapped area contains a header:
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int nch,
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int size,
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unsigned long long counter (updated every time the contents of
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the area changes),
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the rest is payload (non-interleaved).
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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 <inttypes.h>
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#include <unistd.h>
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#include "config.h"
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#ifdef HAVE_SYS_MMAN_H
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#include <sys/types.h>
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#include <sys/mman.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include "af.h"
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extern char * get_path( char * filename );
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#define DEF_SZ 512 // default buffer size (in samples)
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#define SHARED_FILE "mplayer-af_export" /* default file name
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(relative to ~/.mplayer/ */
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#define SIZE_HEADER (2 * sizeof(int) + sizeof(unsigned long long))
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// Data for specific instances of this filter
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typedef struct af_export_s
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{
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unsigned long long count; // Used for sync
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void* buf[AF_NCH]; // Buffers for storing the data before it is exported
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int sz; // Size of buffer in samples
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int wi; // Write index
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int fd; // File descriptor to shared memory area
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char* filename; // File to export data
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void* mmap_area; // MMap shared area
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} af_export_t;
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/* Initialization and runtime control
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af audio filter instance
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cmd control command
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arg argument
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*/
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static int control(struct af_instance_s* af, int cmd, void* arg)
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{
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af_export_t* s = af->setup;
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switch (cmd){
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case AF_CONTROL_REINIT:{
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int i=0;
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int mapsize;
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// Free previous buffers
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if (s->buf && s->buf[0])
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free(s->buf[0]);
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// unmap previous area
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if(s->mmap_area)
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munmap(s->mmap_area, SIZE_HEADER + (af->data->bps*s->sz*af->data->nch));
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// close previous file descriptor
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if(s->fd)
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close(s->fd);
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// Accept only int16_t as input format (which sucks)
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af->data->rate = ((af_data_t*)arg)->rate;
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af->data->nch = ((af_data_t*)arg)->nch;
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af->data->format = AF_FORMAT_S16_NE;
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af->data->bps = 2;
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// If buffer length isn't set, set it to the default value
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if(s->sz == 0)
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s->sz = DEF_SZ;
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// Allocate new buffers (as one continuous block)
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s->buf[0] = calloc(s->sz*af->data->nch, af->data->bps);
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if(NULL == s->buf[0])
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af_msg(AF_MSG_FATAL, "[export] Out of memory\n");
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for(i = 1; i < af->data->nch; i++)
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s->buf[i] = s->buf[0] + i*s->sz*af->data->bps;
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// Init memory mapping
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s->fd = open(s->filename, O_RDWR | O_CREAT | O_TRUNC, 0640);
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af_msg(AF_MSG_INFO, "[export] Exporting to file: %s\n", s->filename);
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if(s->fd < 0)
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af_msg(AF_MSG_FATAL, "[export] Could not open/create file: %s\n",
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s->filename);
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// header + buffer
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mapsize = (SIZE_HEADER + (af->data->bps * s->sz * af->data->nch));
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// grow file to needed size
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for(i = 0; i < mapsize; i++){
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char null = 0;
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write(s->fd, (void*) &null, 1);
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}
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// mmap size
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s->mmap_area = mmap(0, mapsize, PROT_READ|PROT_WRITE,MAP_SHARED, s->fd, 0);
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if(s->mmap_area == NULL)
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af_msg(AF_MSG_FATAL, "[export] Could not mmap file %s\n", s->filename);
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af_msg(AF_MSG_INFO, "[export] Memory mapped to file: %s (%p)\n",
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s->filename, s->mmap_area);
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// Initialize header
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*((int*)s->mmap_area) = af->data->nch;
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*((int*)s->mmap_area + 1) = s->sz * af->data->bps * af->data->nch;
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msync(s->mmap_area, mapsize, MS_ASYNC);
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// Use test_output to return FALSE if necessary
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return af_test_output(af, (af_data_t*)arg);
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}
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case AF_CONTROL_COMMAND_LINE:{
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int i=0;
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char *str = arg;
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if (!str){
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if(s->filename)
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free(s->filename);
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s->filename = get_path(SHARED_FILE);
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return AF_OK;
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}
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while((str[i]) && (str[i] != ':'))
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i++;
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if(s->filename)
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free(s->filename);
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s->filename = calloc(i + 1, sizeof(char));
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memcpy(s->filename, str, i);
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s->filename[i] = 0;
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sscanf(str + i + 1, "%d", &(s->sz));
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return af->control(af, AF_CONTROL_EXPORT_SZ | AF_CONTROL_SET, &s->sz);
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}
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case AF_CONTROL_EXPORT_SZ | AF_CONTROL_SET:
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s->sz = * (int *) arg;
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if((s->sz <= 0) || (s->sz > 2048))
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af_msg( AF_MSG_ERROR, "[export] Buffer size must be between"
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" 1 and 2048\n" );
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return AF_OK;
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case AF_CONTROL_EXPORT_SZ | AF_CONTROL_GET:
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*(int*) arg = s->sz;
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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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/* Free allocated memory and clean up other stuff too.
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af audio filter instance
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*/
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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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af->data = NULL;
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}
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if(af->setup){
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af_export_t* s = af->setup;
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if (s->buf && s->buf[0])
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free(s->buf[0]);
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// Free mmaped area
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if(s->mmap_area)
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munmap(s->mmap_area, sizeof(af_export_t));
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if(s->fd > -1)
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close(s->fd);
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if(s->filename)
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free(s->filename);
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free(af->setup);
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af->setup = NULL;
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}
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}
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/* Filter data through filter
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af audio filter instance
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data audio data
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*/
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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_export_t* s = af->setup; // Setup for this instance
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int16_t* a = c->audio; // Incomming sound
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int nch = c->nch; // Number of channels
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int len = c->len/c->bps; // Number of sample in data chunk
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int sz = s->sz; // buffer size (in samples)
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int flag = 0; // Set to 1 if buffer is filled
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int ch, i;
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// Fill all buffers
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for(ch = 0; ch < nch; ch++){
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int wi = s->wi; // Reset write index
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int16_t* b = s->buf[ch]; // Current buffer
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// Copy data to export buffers
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for(i = ch; i < len; i += nch){
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b[wi++] = a[i];
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if(wi >= sz){ // Don't write outside the end of the buffer
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flag = 1;
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break;
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}
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}
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s->wi = wi % s->sz;
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}
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// Export buffer to mmaped area
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if(flag){
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// update buffer in mapped area
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memcpy(s->mmap_area + SIZE_HEADER, s->buf[0], sz * c->bps * nch);
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s->count++; // increment counter (to sync)
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memcpy(s->mmap_area + SIZE_HEADER - sizeof(s->count),
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&(s->count), sizeof(s->count));
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}
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// We don't modify data, just export it
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return data;
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}
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/* Allocate memory and set function pointers
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af audio filter instance
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returns AF_OK or AF_ERROR
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*/
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static int af_open( af_instance_t* af )
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{
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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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af->setup = calloc(1, sizeof(af_export_t));
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if((af->data == NULL) || (af->setup == NULL))
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return AF_ERROR;
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((af_export_t *)af->setup)->filename = get_path(SHARED_FILE);
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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_export = {
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"Sound export filter",
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"export",
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"Anders; Gustavo Sverzut Barbieri <gustavo.barbieri@ic.unicamp.br>",
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"",
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AF_FLAGS_REENTRANT,
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af_open
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};
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#endif /*HAVE_SYS_MMAN_H*/
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