mirrors/gstreamer
mirrors/gstreamer
1
1
Fork 0
mirror of https://gitlab.freedesktop.org/gstreamer/gstreamer.git synced 2025-06-06 23:48:53 +00:00
Code Issues 1 Projects Releases Wiki Activity

Minor changes

Browse source
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
Show stats Download patch file Download diff file Expand all files Collapse all files

17
gst-sdk/tutorials/basic-tutorial-8.c
View file

@ -1,10 +1,9 @@
#include <gst/gst.h> #include <gst/gst.h>
#include <string.h> #include <string.h>
#include <math.h>
#define CHUNK_SIZE 1024 /* Amount of bytes we are sending in each buffer */ #define CHUNK_SIZE 1024 /* Amount of bytes we are sending in each buffer */
#define SAMPLE_RATE 44100 /* Samples per second we are sending */ #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 */ /* Structure to contain all our information, so we can pass it to callbacks */
typedef struct _CustomData { typedef struct _CustomData {
@ -12,7 +11,7 @@ typedef struct _CustomData {
GstElement *video_queue, *audio_convert2, *visual, *video_convert, *video_sink; GstElement *video_queue, *audio_convert2, *visual, *video_convert, *video_sink;
GstElement *app_queue, *app_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 */ gfloat a, b, c, d; /* For waveform generation */
guint sourceid; /* To control the GSource */ guint sourceid; /* To control the GSource */
@ -28,7 +27,7 @@ static gboolean push_data (CustomData *data) {
GstBuffer *buffer; GstBuffer *buffer;
GstFlowReturn ret; GstFlowReturn ret;
int i; int i;
gshort *raw; gint16 *raw;
gint num_samples = CHUNK_SIZE / 2; /* Because each sample is 16 bits */ gint num_samples = CHUNK_SIZE / 2; /* Because each sample is 16 bits */
gfloat freq; gfloat freq;
@ -36,20 +35,20 @@ static gboolean push_data (CustomData *data) {
buffer = gst_buffer_new_and_alloc (CHUNK_SIZE); buffer = gst_buffer_new_and_alloc (CHUNK_SIZE);
/* Set its timestamp and duration */ /* Set its timestamp and duration */
GST_BUFFER_TIMESTAMP (buffer) = GST_SECOND * data->time / SAMPLE_RATE; GST_BUFFER_TIMESTAMP (buffer) = gst_util_uint64_scale (data->num_samples, GST_SECOND, SAMPLE_RATE);
GST_BUFFER_DURATION (buffer) = GST_SECOND * CHUNK_SIZE / SAMPLE_RATE; GST_BUFFER_DURATION (buffer) = gst_util_uint64_scale (CHUNK_SIZE, GST_SECOND, SAMPLE_RATE);
/* Generate some psychodelic waveforms */ /* Generate some psychodelic waveforms */
raw = (gshort *)GST_BUFFER_DATA (buffer); raw = (gint16 *)GST_BUFFER_DATA (buffer);
data->c += data->d; data->c += data->d;
data->d -= data->c / 1000; data->d -= data->c / 1000;
freq = 1100 + 1000 * data->d; freq = 1100 + 1000 * data->d;
for (i = 0; i < num_samples; i++) { for (i = 0; i < num_samples; i++) {
data->a += data->b; data->a += data->b;
data->b -= data->a / freq; 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 */ /* Push the buffer into the appsrc */
g_signal_emit_by_name (data->app_source, "push-buffer", buffer, &ret); g_signal_emit_by_name (data->app_source, "push-buffer", buffer, &ret);