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-rw-r--r--libaf/af_export.c263
1 files changed, 263 insertions, 0 deletions
diff --git a/libaf/af_export.c b/libaf/af_export.c
new file mode 100644
index 0000000000..9126384348
--- /dev/null
+++ b/libaf/af_export.c
@@ -0,0 +1,263 @@
+/* This audio filter exports the incomming signal to other processes
+ using memory mapping. Memory mapped area contains a header:
+ int nch,
+ int size,
+ unsigned long long counter (updated every time the contents of
+ the area changes),
+ the rest is payload (non-interleaved).
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <inttypes.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/mman.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+#include "af.h"
+
+extern char * get_path( char * filename );
+
+
+#define DEF_SZ 512 // default buffer size (in samples)
+#define SHARED_FILE "mplayer-af_export" /* default file name
+ (relative to ~/.mplayer/ */
+
+#define SIZE_HEADER (2 * sizeof(int) + sizeof(unsigned long long))
+
+// Data for specific instances of this filter
+typedef struct af_export_s
+{
+ unsigned long long count; // Used for sync
+ void* buf[AF_NCH]; // Buffers for storing the data before it is exported
+ int sz; // Size of buffer in samples
+ int wi; // Write index
+ int fd; // File descriptor to shared memory area
+ char* filename; // File to export data
+ void* mmap_area; // MMap shared area
+} af_export_t;
+
+
+/* Initialization and runtime control
+ af audio filter instance
+ cmd control command
+ arg argument
+*/
+static int control(struct af_instance_s* af, int cmd, void* arg)
+{
+ af_export_t* s = af->setup;
+ switch (cmd){
+ case AF_CONTROL_REINIT:{
+ int i=0;
+ int mapsize;
+
+ // Free previous buffers
+ if (s->buf && s->buf[0])
+ free(s->buf[0]);
+
+ // unmap previous area
+ if(s->mmap_area)
+ munmap(s->mmap_area, SIZE_HEADER + (af->data->bps*s->sz*af->data->nch));
+ // close previous file descriptor
+ if(s->fd)
+ close(s->fd);
+
+ // Accept only int16_t as input fomat (which sucks)
+ af->data->rate = ((af_data_t*)arg)->rate;
+ af->data->nch = ((af_data_t*)arg)->nch;
+ af->data->format = AF_FORMAT_SI | AF_FORMAT_NE;
+ af->data->bps = 2;
+
+ // If buffer length isn't set, set it to the default value
+ if(s->sz == 0)
+ s->sz = DEF_SZ;
+
+ // Allocate new buffers (as one continous block)
+ s->buf[0] = calloc(DEF_SZ*af->data->nch, af->data->bps);
+ if(NULL == s->buf[0])
+ af_msg(AF_MSG_FATAL, "[export] Out of memory\n");
+ for(i = 1; i < af->data->nch; i++)
+ s->buf[i] = s->buf[0] + i*DEF_SZ*af->data->bps;
+
+ // Init memory mapping
+ s->fd = open(s->filename, O_RDWR | O_CREAT | O_TRUNC, 0640);
+ af_msg(AF_MSG_INFO, "[export] Exporting to file: %s\n", s->filename);
+ if(s->fd < 0)
+ af_msg(AF_MSG_FATAL, "[export] Could not open/create file: %s\n",
+ s->filename);
+
+ // header + buffer
+ mapsize = (SIZE_HEADER + (af->data->bps * s->sz * af->data->nch));
+
+ // grow file to needed size
+ for(i = 0; i < mapsize; i++){
+ char null = 0;
+ write(s->fd, (void*) &null, 1);
+ }
+
+ // mmap size
+ s->mmap_area = mmap(0, mapsize, PROT_READ|PROT_WRITE,MAP_SHARED, s->fd, 0);
+ if(s->mmap_area == NULL)
+ af_msg(AF_MSG_FATAL, "[export] Could not mmap file %s\n", s->filename);
+ af_msg(AF_MSG_INFO, "[export] Memory mapped to file: %s (%p)\n",
+ s->filename, s->mmap_area);
+
+ // Initialize header
+ *((int*)s->mmap_area) = af->data->nch;
+ *((int*)s->mmap_area + 1) = s->sz * af->data->bps * af->data->nch;
+ msync(s->mmap_area, mapsize, MS_ASYNC);
+
+ // Use test_output to return FALSE if necessary
+ return af_test_output(af, (af_data_t*)arg);
+ }
+ case AF_CONTROL_COMMAND_LINE:{
+ int i=0;
+ char *str = arg;
+
+ if (!str){
+ if(s->filename)
+ free(s->filename);
+
+ s->filename = get_path(SHARED_FILE);
+ return AF_OK;
+ }
+
+ while((str[i]) && (str[i] != ':'))
+ i++;
+
+ if(s->filename)
+ free(s->filename);
+
+ s->filename = calloc(i + 1, sizeof(char));
+ memcpy(s->filename, str, i);
+ s->filename[i] = 0;
+
+ sscanf(str + i, "%d", &(s->sz));
+
+ return af->control(af, AF_CONTROL_EXPORT_SZ | AF_CONTROL_SET, &s->sz);
+ }
+ case AF_CONTROL_EXPORT_SZ | AF_CONTROL_SET:
+ s->sz = * (int *) arg;
+ if((s->sz <= 0) || (s->sz > 2048))
+ af_msg( AF_MSG_ERROR, "[export] Buffer size must be between"
+ " 1 and 2048\n" );
+
+ return AF_OK;
+ case AF_CONTROL_EXPORT_SZ | AF_CONTROL_GET:
+ *(int*) arg = s->sz;
+ return AF_OK;
+
+ }
+ return AF_UNKNOWN;
+}
+
+/* Free allocated memory and clean up other stuff too.
+ af audio filter instance
+*/
+static void uninit( struct af_instance_s* af )
+{
+ int i;
+ if (af->data){
+ free(af->data);
+ af->data = NULL;
+ }
+
+ if(af->setup){
+ af_export_t* s = af->setup;
+ if (s->buf && s->buf[0])
+ free(s->buf[0]);
+
+ // Free mmaped area
+ if(s->mmap_area)
+ munmap(s->mmap_area, sizeof(af_export_t));
+
+ if(s->fd > -1)
+ close(s->fd);
+
+ if(s->filename)
+ free(s->filename);
+
+ free(af->setup);
+ af->setup = NULL;
+ }
+}
+
+/* Filter data through filter
+ af audio filter instance
+ data audio data
+*/
+static af_data_t* play( struct af_instance_s* af, af_data_t* data )
+{
+ af_data_t* c = data; // Current working data
+ af_export_t* s = af->setup; // Setup for this instance
+ int16_t* a = c->audio; // Incomming sound
+ int nch = c->nch; // Number of channels
+ int len = c->len/c->bps; // Number of sample in data chunk
+ int sz = s->sz; // buffer size (in samples)
+ int flag = 0; // Set to 1 if buffer is filled
+
+ int ch, i;
+
+ // Fill all buffers
+ for(ch = 0; ch < nch; ch++){
+ int wi = s->wi; // Reset write index
+ int16_t* b = s->buf[ch]; // Current buffer
+
+ // Copy data to export buffers
+ for(i = ch; i < len; i += nch){
+ b[wi++] = a[i];
+ if(wi >= sz){ // Don't write outside the end of the buffer
+ flag = 1;
+ break;
+ }
+ }
+ s->wi = wi % s->sz;
+ }
+
+ // Export buffer to mmaped area
+ if(flag){
+ // update buffer in mapped area
+ memcpy(s->mmap_area + SIZE_HEADER, s->buf[0], sz * c->bps * nch);
+ s->count++; // increment counter (to sync)
+ memcpy(s->mmap_area + SIZE_HEADER - sizeof(s->count),
+ &(s->count), sizeof(s->count));
+ }
+
+ // We don't modify data, just export it
+ return data;
+}
+
+/* Allocate memory and set function pointers
+ af audio filter instance
+ returns AF_OK or AF_ERROR
+*/
+static int af_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_export_t));
+ if((af->data == NULL) || (af->setup == NULL))
+ return AF_ERROR;
+
+ ((af_export_t *)af->setup)->filename = get_path(SHARED_FILE);
+
+ return AF_OK;
+}
+
+// Description of this filter
+af_info_t af_info_export = {
+ "Sound export filter",
+ "export",
+ "Anders; Gustavo Sverzut Barbieri <gustavo.barbieri@ic.unicamp.br>",
+ "",
+ AF_FLAGS_REENTRANT,
+ af_open
+};
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