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This commit is contained in:
Xavi Artigas 2012-05-11 16:55:37 +02:00 committed by unknown
parent 2cceb62cf3
commit 64dc844baa
1 changed files with 8 additions and 9 deletions
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17
gst-sdk/tutorials/basic-tutorial-8.c
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@ -1,10 +1,9 @@
#include <gst/gst.h>
#include <string.h>
#include <math.h>
#define CHUNK_SIZE 1024 /* Amount of bytes we are sending in each buffer */
#define SAMPLE_RATE 44100 /* Samples per second we are sending */
#define AUDIO_CAPS "audio/x-raw-int,channels=1,rate=%d,signed=(boolean)true,width=16,depth=16,endianness=1234"
#define AUDIO_CAPS "audio/x-raw-int,channels=1,rate=%d,signed=(boolean)true,width=16,depth=16,endianness=BYTE_ORDER"
/* Structure to contain all our information, so we can pass it to callbacks */
typedef struct _CustomData {
@ -12,7 +11,7 @@ typedef struct _CustomData {
GstElement *video_queue, *audio_convert2, *visual, *video_convert, *video_sink;
GstElement *app_queue, *app_sink;
gint time; /* For timestamp generation */
guint64 num_samples; /* Number of samples generated so far (for timestamp generation) */
gfloat a, b, c, d; /* For waveform generation */
guint sourceid; /* To control the GSource */
@ -28,7 +27,7 @@ static gboolean push_data (CustomData *data) {
GstBuffer *buffer;
GstFlowReturn ret;
int i;
gshort *raw;
gint16 *raw;
gint num_samples = CHUNK_SIZE / 2; /* Because each sample is 16 bits */
gfloat freq;
@ -36,20 +35,20 @@ static gboolean push_data (CustomData *data) {
buffer = gst_buffer_new_and_alloc (CHUNK_SIZE);
/* Set its timestamp and duration */
GST_BUFFER_TIMESTAMP (buffer) = GST_SECOND * data->time / SAMPLE_RATE;
GST_BUFFER_DURATION (buffer) = GST_SECOND * CHUNK_SIZE / SAMPLE_RATE;
GST_BUFFER_TIMESTAMP (buffer) = gst_util_uint64_scale (data->num_samples, GST_SECOND, SAMPLE_RATE);
GST_BUFFER_DURATION (buffer) = gst_util_uint64_scale (CHUNK_SIZE, GST_SECOND, SAMPLE_RATE);
/* Generate some psychodelic waveforms */
raw = (gshort *)GST_BUFFER_DATA (buffer);
raw = (gint16 *)GST_BUFFER_DATA (buffer);
data->c += data->d;
data->d -= data->c / 1000;
freq = 1100 + 1000 * data->d;
for (i = 0; i < num_samples; i++) {
data->a += data->b;
data->b -= data->a / freq;
raw[i] = (gshort)(500 * data->a);
raw[i] = (gint16)(500 * data->a);
}
data->time += num_samples;
data->num_samples += num_samples;
/* Push the buffer into the appsrc */
g_signal_emit_by_name (data->app_source, "push-buffer", buffer, &ret);