mirror of
https://github.com/mpromonet/v4l2rtspserver
synced 2024-11-17 21:25:40 +00:00
83 lines
3.0 KiB
C
83 lines
3.0 KiB
C
|
/* ---------------------------------------------------------------------------
|
||
|
|
** This software is in the public domain, furnished "as is", without technical
|
||
|
|
** support, and with no warranty, express or implied, as to its usefulness for
|
||
|
|
** any purpose.
|
||
|
|
**
|
||
|
|
** ALSACapture.cpp
|
||
|
|
**
|
||
|
|
** V4L2 RTSP streamer
|
||
|
|
**
|
||
|
|
** ALSA capture overide of V4l2Capture
|
||
|
|
**
|
||
|
|
** -------------------------------------------------------------------------*/
|
||
|
|
|
||
|
|
#include <alsa/asoundlib.h>
|
||
|
|
|
||
|
|
class ALSACapture : public V4l2Capture
|
||
|
|
{
|
||
|
|
public:
|
||
|
|
static ALSACapture* createNew(V4L2DeviceParameters params) { return new ALSACapture(params); }
|
||
|
|
virtual ~ALSACapture()
|
||
|
|
{
|
||
|
|
if (m_pcm != NULL)
|
||
|
|
{
|
||
|
|
snd_pcm_close (m_pcm);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
protected:
|
||
|
|
ALSACapture(V4L2DeviceParameters params) : V4l2Device(params,V4L2_BUF_TYPE_VIDEO_CAPTURE), V4l2Capture(params), m_pcm(NULL)
|
||
|
|
{
|
||
|
|
snd_pcm_hw_params_t *hw_params = NULL;
|
||
|
|
int err = 0;
|
||
|
|
unsigned int rate = 44100;
|
||
|
|
|
||
|
|
// open PCM device
|
||
|
|
if ((err = snd_pcm_open (&m_pcm, params.m_devName.c_str(), SND_PCM_STREAM_CAPTURE, 0)) < 0) {
|
||
|
|
fprintf (stderr, "cannot open audio device %s (%s)\n", params.m_devName.c_str(), snd_strerror (err));
|
||
|
|
}
|
||
|
|
|
||
|
|
// configure hw_params
|
||
|
|
else if ((err = snd_pcm_hw_params_malloc (&hw_params)) < 0) {
|
||
|
|
fprintf (stderr, "cannot allocate hardware parameter structure (%s)\n", snd_strerror (err));
|
||
|
|
}
|
||
|
|
else if ((err = snd_pcm_hw_params_any (m_pcm, hw_params)) < 0) {
|
||
|
|
fprintf (stderr, "cannot initialize hardware parameter structure (%s)\n", snd_strerror (err));
|
||
|
|
}
|
||
|
|
else if ((err = snd_pcm_hw_params_set_access (m_pcm, hw_params, SND_PCM_ACCESS_RW_INTERLEAVED)) < 0) {
|
||
|
|
fprintf (stderr, "cannot set access type (%s)\n", snd_strerror (err));
|
||
|
|
}
|
||
|
|
else if ((err = snd_pcm_hw_params_set_format (m_pcm, hw_params, SND_PCM_FORMAT_S16_BE)) < 0) {
|
||
|
|
fprintf (stderr, "cannot set sample format (%s)\n", snd_strerror (err));
|
||
|
|
}
|
||
|
|
else if ((err = snd_pcm_hw_params_set_rate_near (m_pcm, hw_params, &rate, 0)) < 0) {
|
||
|
|
fprintf (stderr, "cannot set sample rate (%s)\n", snd_strerror (err));
|
||
|
|
}
|
||
|
|
else if ((err = snd_pcm_hw_params_set_channels (m_pcm, hw_params, 2)) < 0) {
|
||
|
|
fprintf (stderr, "cannot set channel count (%s)\n", snd_strerror (err));
|
||
|
|
}
|
||
|
|
else if ((err = snd_pcm_hw_params (m_pcm, hw_params)) < 0) {
|
||
|
|
fprintf (stderr, "cannot set parameters (%s)\n", snd_strerror (err));
|
||
|
|
}
|
||
|
|
// start capture
|
||
|
|
else if ((err = snd_pcm_prepare (m_pcm)) < 0) {
|
||
|
|
fprintf (stderr, "cannot prepare audio interface for use (%s)\n", snd_strerror (err));
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
public:
|
||
|
|
virtual size_t read(char* buffer, size_t bufferSize)
|
||
|
|
{
|
||
|
|
size_t ret = snd_pcm_readi (m_pcm, buffer, bufferSize);
|
||
|
|
fprintf (stderr, "snd_pcm_readi size:%ld\n", ret);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
virtual bool isReady() { return (m_pcm != NULL); };
|
||
|
|
|
||
|
|
private:
|
||
|
|
snd_pcm_t* m_pcm;
|
||
|
|
|
||
|
|
};
|
||
|
|
|