Sailfish下的Gstreamer OS 没有输出声音
Gstreamer under Sailfish OS no output sound
我正在为 Sailfish OS 开发音频播放器,并尝试通过 gstreamer 播放文件,但问题是:没有声音。
我通过控制台检查了 gstream:
gst-launch-0.10 filesrc location=/path/to/file.ogg ! decodebin !
autoaudiosink
它工作正常!
我测试了将音频文件转换为音频文件:
int
main (int argc,
char *argv[])
{
GstElement *pipeline;
GstBus *bus;
GstMessage *msg;
gst_init (&argc, &argv);
pipeline = gst_parse_launch ("filesrc location=/home/nemo/Music/Ringtones/Myfile.mp3 ! decodebin ! audioconvert ! vorbisenc ! oggmux ! filesink location=test.ogg", NULL);
gst_element_set_state (pipeline, GST_STATE_PLAYING);
bus = gst_element_get_bus (pipeline);
msg = gst_bus_timed_pop_filtered (bus, GST_CLOCK_TIME_NONE, (GstMessageType)(GST_MESSAGE_ERROR | GST_MESSAGE_EOS));
if (msg != NULL)
gst_message_unref (msg);
gst_object_unref (bus);
gst_element_set_state (pipeline, GST_STATE_NULL);
gst_object_unref (pipeline);
return 0;
}
它工作正常!
但是,当我尝试播放它时,没有声音:
pipeline = gst_parse_launch ("filesrc location=/home/nemo/Music/Ringtones/Myfile.mp3 ! decodebin ! audioconvert ! autoaudiosink", NULL);
Gstreamer 版本:0.10
问题是因为资源在使用前需要获取:
gst-launch在资源策略配置中静态设置为"player",所以可以运行不需要任何额外的工作。
但是当您创建自己的应用程序时,您将需要自己获取音频播放资源。
检查 https://github.com/nemomobile/libaudioresource if you are developing C-only application or https://github.com/nemomobile/libaudioresource-qt Qt 应用程序。
示例:
#include <gst/gst.h>
#include <audioresource.h>
#include <glib.h>
#include <unistd.h>
#include <stdio.h>
/*
* Dependencies glib2-devel, libaudioresource-devel, gstreamer-devel.
* Compile with:
* gcc `pkg-config --cflags --libs gstreamer-0.10` `pkg-config --cflags --libs audioresource` `pkg-config --cflags --libs glib-2.0` gst-example.c -o gst-example
*
* Check https://github.com/nemomobile/libaudioresource
*/
static GstElement *pipeline;
static int got_reply = 0;
static void on_acquired(audioresource_t *audio_resource, bool acquired, void *user_data)
{
got_reply = 1;
printf("on_acquired: %s\n", acquired ? "true" : "false");
if (acquired) {
// start playback here
printf("start playback\n");
gst_element_set_state (pipeline, GST_STATE_PLAYING);
} else {
// stop playback here
}
}
static void naive_wait()
{
got_reply = 0;
while (!got_reply) {
g_main_context_iteration(NULL, false);
usleep(1000);
}
}
int main(int argc, char *argv[])
{
audioresource_t *resource;
void *user_data = NULL;
char tmp[1024];
GstBus *bus;
GstMessage *msg;
if (argc < 2) {
printf("audio file argument needed.\n");
return 1;
}
gst_init (&argc, &argv);
printf("initialize audioresource for media player\n");
resource = audioresource_init(AUDIO_RESOURCE_MEDIA, on_acquired, user_data);
snprintf(tmp, 1024, "filesrc location=%s ! decodebin ! audiocovert ! autoaudiosink", argv[1]);
printf("create pipeline: %s\n", tmp);
pipeline = gst_parse_launch (tmp, NULL);
printf("acquire audioresource..\n");
// When you want to start playback
audioresource_acquire(resource);
// Wait for the reply for acquire..
naive_wait();
bus = gst_element_get_bus (pipeline);
msg = gst_bus_timed_pop_filtered (bus, GST_CLOCK_TIME_NONE, (GstMessageType)(GST_MESSAGE_ERROR | GST_MESSAGE_EOS));
if (msg != NULL)
gst_message_unref (msg);
gst_object_unref (bus);
gst_element_set_state (pipeline, GST_STATE_NULL);
gst_object_unref (pipeline);
printf("release audioresource..\n");
audioresource_release(resource);
// Wait for release..
naive_wait();
// When you close your application
audioresource_free(resource);
return 0;
}
感谢 Juho Hämäläinen 的回答!
我正在为 Sailfish OS 开发音频播放器,并尝试通过 gstreamer 播放文件,但问题是:没有声音。
我通过控制台检查了 gstream:
gst-launch-0.10 filesrc location=/path/to/file.ogg ! decodebin ! autoaudiosink
它工作正常!
我测试了将音频文件转换为音频文件:
int
main (int argc,
char *argv[])
{
GstElement *pipeline;
GstBus *bus;
GstMessage *msg;
gst_init (&argc, &argv);
pipeline = gst_parse_launch ("filesrc location=/home/nemo/Music/Ringtones/Myfile.mp3 ! decodebin ! audioconvert ! vorbisenc ! oggmux ! filesink location=test.ogg", NULL);
gst_element_set_state (pipeline, GST_STATE_PLAYING);
bus = gst_element_get_bus (pipeline);
msg = gst_bus_timed_pop_filtered (bus, GST_CLOCK_TIME_NONE, (GstMessageType)(GST_MESSAGE_ERROR | GST_MESSAGE_EOS));
if (msg != NULL)
gst_message_unref (msg);
gst_object_unref (bus);
gst_element_set_state (pipeline, GST_STATE_NULL);
gst_object_unref (pipeline);
return 0;
}
它工作正常!
但是,当我尝试播放它时,没有声音:
pipeline = gst_parse_launch ("filesrc location=/home/nemo/Music/Ringtones/Myfile.mp3 ! decodebin ! audioconvert ! autoaudiosink", NULL);
Gstreamer 版本:0.10
问题是因为资源在使用前需要获取:
gst-launch在资源策略配置中静态设置为"player",所以可以运行不需要任何额外的工作。
但是当您创建自己的应用程序时,您将需要自己获取音频播放资源。
检查 https://github.com/nemomobile/libaudioresource if you are developing C-only application or https://github.com/nemomobile/libaudioresource-qt Qt 应用程序。
示例:
#include <gst/gst.h>
#include <audioresource.h>
#include <glib.h>
#include <unistd.h>
#include <stdio.h>
/*
* Dependencies glib2-devel, libaudioresource-devel, gstreamer-devel.
* Compile with:
* gcc `pkg-config --cflags --libs gstreamer-0.10` `pkg-config --cflags --libs audioresource` `pkg-config --cflags --libs glib-2.0` gst-example.c -o gst-example
*
* Check https://github.com/nemomobile/libaudioresource
*/
static GstElement *pipeline;
static int got_reply = 0;
static void on_acquired(audioresource_t *audio_resource, bool acquired, void *user_data)
{
got_reply = 1;
printf("on_acquired: %s\n", acquired ? "true" : "false");
if (acquired) {
// start playback here
printf("start playback\n");
gst_element_set_state (pipeline, GST_STATE_PLAYING);
} else {
// stop playback here
}
}
static void naive_wait()
{
got_reply = 0;
while (!got_reply) {
g_main_context_iteration(NULL, false);
usleep(1000);
}
}
int main(int argc, char *argv[])
{
audioresource_t *resource;
void *user_data = NULL;
char tmp[1024];
GstBus *bus;
GstMessage *msg;
if (argc < 2) {
printf("audio file argument needed.\n");
return 1;
}
gst_init (&argc, &argv);
printf("initialize audioresource for media player\n");
resource = audioresource_init(AUDIO_RESOURCE_MEDIA, on_acquired, user_data);
snprintf(tmp, 1024, "filesrc location=%s ! decodebin ! audiocovert ! autoaudiosink", argv[1]);
printf("create pipeline: %s\n", tmp);
pipeline = gst_parse_launch (tmp, NULL);
printf("acquire audioresource..\n");
// When you want to start playback
audioresource_acquire(resource);
// Wait for the reply for acquire..
naive_wait();
bus = gst_element_get_bus (pipeline);
msg = gst_bus_timed_pop_filtered (bus, GST_CLOCK_TIME_NONE, (GstMessageType)(GST_MESSAGE_ERROR | GST_MESSAGE_EOS));
if (msg != NULL)
gst_message_unref (msg);
gst_object_unref (bus);
gst_element_set_state (pipeline, GST_STATE_NULL);
gst_object_unref (pipeline);
printf("release audioresource..\n");
audioresource_release(resource);
// Wait for release..
naive_wait();
// When you close your application
audioresource_free(resource);
return 0;
}
感谢 Juho Hämäläinen 的回答!