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mpv/stream/tvi_v4l2.c

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/*
* Video 4 Linux 2 input
*
* copyright (c) 2003 Martin Olschewski <olschewski@zpr.uni-koeln.de>
* copyright (c) 2003 Jindrich Makovicka <makovick@gmail.com>
*
* Some ideas are based on works from
* Alex Beregszaszi <alex@fsn.hu>
* Gerd Knorr <kraxel@bytesex.org>
*
* This file is part of MPlayer.
*
* MPlayer is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* MPlayer is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with MPlayer; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
/*
known issues:
- norm setting isn't consistent with tvi_v4l
- the same for volume/bass/treble/balance
*/
#include "config.h"
#include <errno.h>
#include <fcntl.h>
#include <pthread.h>
#include <stdio.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>
#include <math.h>
#ifdef HAVE_SYS_SYSINFO_H
#include <sys/sysinfo.h>
#endif
#ifdef HAVE_SYS_VIDEOIO_H
#include <sys/videoio.h>
#else
#include <linux/types.h>
#include <linux/videodev2.h>
#endif
#include "core/mp_msg.h"
#include "video/img_fourcc.h"
#include "audio/format.h"
#include "tv.h"
#include "audio_in.h"
#define info tvi_info_v4l2
static tvi_handle_t *tvi_init_v4l2(tv_param_t* tv_param);
/* information about this file */
const tvi_info_t tvi_info_v4l2 = {
tvi_init_v4l2,
"Video 4 Linux 2 input",
"v4l2",
"Martin Olschewski <olschewski@zpr.uni-koeln.de>",
"first try, more to come ;-)"
};
struct map {
struct v4l2_buffer buf;
void *addr;
size_t len;
};
#define BUFFER_COUNT 6
/** video ringbuffer entry */
typedef struct {
unsigned char *data; ///< frame contents
long long timestamp; ///< frame timestamp
int framesize; ///< actual frame size
} video_buffer_entry;
/* private data */
typedef struct priv {
/* video */
char *video_dev;
int video_fd;
char *vbi_dev;
int vbi_fd;
int vbi_bufsize;
int vbi_shutdown;
pthread_t vbi_grabber_thread;
void *priv_vbi;
int mp_format;
struct v4l2_capability capability;
struct v4l2_input input;
struct v4l2_format format;
struct v4l2_standard standard;
struct v4l2_tuner tuner;
struct map *map;
int mapcount;
int frames;
volatile long long first_frame;
long long curr_frame;
/* audio video interleaving ;-) */
volatile int streamon;
pthread_t audio_grabber_thread;
pthread_mutex_t skew_mutex;
/* 2nd level video buffers */
int first;
int immediate_mode;
int video_buffer_size_max;
volatile int video_buffer_size_current;
video_buffer_entry *video_ringbuffer;
volatile int video_head;
volatile int video_tail;
volatile int video_cnt;
pthread_t video_grabber_thread;
pthread_mutex_t video_buffer_mutex;
/* audio */
char *audio_dev;
audio_in_t audio_in;
long long audio_start_time;
int audio_buffer_size;
int aud_skew_cnt;
unsigned char *audio_ringbuffer;
long long *audio_skew_buffer;
long long *audio_skew_delta_buffer;
volatile int audio_head;
volatile int audio_tail;
volatile int audio_cnt;
volatile long long audio_skew;
volatile double audio_skew_factor;
volatile long long audio_skew_measure_time;
volatile int audio_drop;
volatile int shutdown;
int audio_initialized;
double audio_secs_per_block;
long long audio_usecs_per_block;
long long audio_skew_total;
long long audio_skew_delta_total;
long audio_recv_blocks_total;
long audio_sent_blocks_total;
pthread_mutex_t audio_mutex;
int audio_insert_null_samples;
volatile long audio_null_blocks_inserted;
volatile long long dropped_frames_timeshift;
long long dropped_frames_compensated;
tv_param_t *tv_param;
} priv_t;
typedef struct tt_stream_props_s{
int sampling_rate;
int samples_per_line;
int offset;
int count[2]; ///< number of lines in first and second fields
int interlaced; ///< vbi data are interlaced
int bufsize; ///< required buffer size
} tt_stream_props;
#include "tvi_def.h"
static void *audio_grabber(void *data);
static void *video_grabber(void *data);
/**********************************************************************\
Only few of the fourccs are the same in v4l2 and mplayer:
MP_FOURCC_YVU9 == V4L2_PIX_FMT_YVU410
MP_FOURCC_YV12 == V4L2_PIX_FMT_YVU420
MP_FOURCC_NV12 == V4L2_PIX_FMT_NV12
MP_FOURCC_422P == V4L2_PIX_FMT_YUV422P
MP_FOURCC_411P == V4L2_PIX_FMT_YUV411P
MP_FOURCC_UYVY == V4L2_PIX_FMT_UYVY
MP_FOURCC_Y41P == V4L2_PIX_FMT_Y41P
This may be an useful translation table for some others:
MP_FOURCC_RGB8 == V4L2_PIX_FMT_RGB332
MP_FOURCC_BGR15 == V4L2_PIX_FMT_RGB555
MP_FOURCC_BGR16 == V4L2_PIX_FMT_RGB565
MP_FOURCC_RGB24 == V4L2_PIX_FMT_RGB24
MP_FOURCC_RGB32 == V4L2_PIX_FMT_RGB32
MP_FOURCC_BGR24 == V4L2_PIX_FMT_BGR24
MP_FOURCC_BGR32 == V4L2_PIX_FMT_BGR32
MP_FOURCC_Y800 == V4L2_PIX_FMT_GREY
MP_FOURCC_YUV9 == V4L2_PIX_FMT_YUV410
MP_FOURCC_I420 == V4L2_PIX_FMT_YUV420
MP_FOURCC_YUY2 == V4L2_PIX_FMT_YUYV
\**********************************************************************/
/*
** Translate a mplayer fourcc to a video4linux2 pixel format.
*/
static int fcc_mp2vl(int fcc)
{
switch (fcc) {
case MP_FOURCC_RGB8: return V4L2_PIX_FMT_RGB332;
case MP_FOURCC_BGR15: return V4L2_PIX_FMT_RGB555;
case MP_FOURCC_BGR16: return V4L2_PIX_FMT_RGB565;
case MP_FOURCC_RGB24: return V4L2_PIX_FMT_RGB24;
case MP_FOURCC_RGB32: return V4L2_PIX_FMT_RGB32;
case MP_FOURCC_BGR24: return V4L2_PIX_FMT_BGR24;
case MP_FOURCC_BGR32: return V4L2_PIX_FMT_BGR32;
case MP_FOURCC_Y800: return V4L2_PIX_FMT_GREY;
case MP_FOURCC_YUV9: return V4L2_PIX_FMT_YUV410;
case MP_FOURCC_I420: return V4L2_PIX_FMT_YUV420;
case MP_FOURCC_YUY2: return V4L2_PIX_FMT_YUYV;
case MP_FOURCC_YV12: return V4L2_PIX_FMT_YVU420;
case MP_FOURCC_UYVY: return V4L2_PIX_FMT_UYVY;
case MP_FOURCC_MJPEG: return V4L2_PIX_FMT_MJPEG;
}
return fcc;
}
/*
** Translate a video4linux2 fourcc aka pixel format to mplayer.
*/
static int fcc_vl2mp(int fcc)
{
switch (fcc) {
case V4L2_PIX_FMT_RGB332: return MP_FOURCC_RGB8;
case V4L2_PIX_FMT_RGB555: return MP_FOURCC_BGR15;
case V4L2_PIX_FMT_RGB565: return MP_FOURCC_BGR16;
case V4L2_PIX_FMT_RGB24: return MP_FOURCC_RGB24;
case V4L2_PIX_FMT_RGB32: return MP_FOURCC_RGB32;
case V4L2_PIX_FMT_BGR24: return MP_FOURCC_BGR24;
case V4L2_PIX_FMT_BGR32: return MP_FOURCC_BGR32;
case V4L2_PIX_FMT_GREY: return MP_FOURCC_Y800;
case V4L2_PIX_FMT_YUV410: return MP_FOURCC_YUV9;
case V4L2_PIX_FMT_YUV420: return MP_FOURCC_I420;
case V4L2_PIX_FMT_YVU420: return MP_FOURCC_YV12;
case V4L2_PIX_FMT_YUYV: return MP_FOURCC_YUY2;
case V4L2_PIX_FMT_UYVY: return MP_FOURCC_UYVY;
case V4L2_PIX_FMT_MJPEG: return MP_FOURCC_MJPEG;
}
return fcc;
}
/*
** Translate a video4linux2 fourcc aka pixel format
** to a human readable string.
*/
static const char *pixfmt2name(int pixfmt)
{
static char unknown[24];
switch (pixfmt) {
case V4L2_PIX_FMT_RGB332: return "RGB332";
case V4L2_PIX_FMT_RGB555: return "RGB555";
case V4L2_PIX_FMT_RGB565: return "RGB565";
case V4L2_PIX_FMT_RGB555X: return "RGB555X";
case V4L2_PIX_FMT_RGB565X: return "RGB565X";
case V4L2_PIX_FMT_BGR24: return "BGR24";
case V4L2_PIX_FMT_RGB24: return "RGB24";
case V4L2_PIX_FMT_BGR32: return "BGR32";
case V4L2_PIX_FMT_RGB32: return "RGB32";
case V4L2_PIX_FMT_GREY: return "GREY";
case V4L2_PIX_FMT_YVU410: return "YVU410";
case V4L2_PIX_FMT_YVU420: return "YVU420";
case V4L2_PIX_FMT_YUYV: return "YUYV";
case V4L2_PIX_FMT_UYVY: return "UYVY";
/* case V4L2_PIX_FMT_YVU422P: return "YVU422P"; */
/* case V4L2_PIX_FMT_YVU411P: return "YVU411P"; */
case V4L2_PIX_FMT_YUV422P: return "YUV422P";
case V4L2_PIX_FMT_YUV411P: return "YUV411P";
case V4L2_PIX_FMT_Y41P: return "Y41P";
case V4L2_PIX_FMT_NV12: return "NV12";
case V4L2_PIX_FMT_NV21: return "NV21";
case V4L2_PIX_FMT_YUV410: return "YUV410";
case V4L2_PIX_FMT_YUV420: return "YUV420";
case V4L2_PIX_FMT_YYUV: return "YYUV";
case V4L2_PIX_FMT_HI240: return "HI240";
case V4L2_PIX_FMT_WNVA: return "WNVA";
case V4L2_PIX_FMT_MJPEG: return "MJPEG";
}
sprintf(unknown, "unknown (0x%x)", pixfmt);
return unknown;
}
/*
** Gives the depth of a video4linux2 fourcc aka pixel format in bits.
*/
static int pixfmt2depth(int pixfmt)
{
switch (pixfmt) {
case V4L2_PIX_FMT_RGB332:
return 8;
case V4L2_PIX_FMT_RGB555:
case V4L2_PIX_FMT_RGB565:
case V4L2_PIX_FMT_RGB555X:
case V4L2_PIX_FMT_RGB565X:
return 16;
case V4L2_PIX_FMT_BGR24:
case V4L2_PIX_FMT_RGB24:
return 24;
case V4L2_PIX_FMT_BGR32:
case V4L2_PIX_FMT_RGB32:
return 32;
case V4L2_PIX_FMT_GREY:
return 8;
case V4L2_PIX_FMT_YVU410:
return 9;
case V4L2_PIX_FMT_YVU420:
return 12;
case V4L2_PIX_FMT_YUYV:
case V4L2_PIX_FMT_UYVY:
case V4L2_PIX_FMT_YUV422P:
case V4L2_PIX_FMT_YUV411P:
return 16;
case V4L2_PIX_FMT_Y41P:
case V4L2_PIX_FMT_NV12:
case V4L2_PIX_FMT_NV21:
return 12;
case V4L2_PIX_FMT_YUV410:
return 9;
case V4L2_PIX_FMT_YUV420:
return 12;
case V4L2_PIX_FMT_YYUV:
return 16;
case V4L2_PIX_FMT_HI240:
return 8;
}
return 0;
}
static int amode2v4l(int amode)
{
switch (amode) {
case 0:
return V4L2_TUNER_MODE_MONO;
case 1:
return V4L2_TUNER_MODE_STEREO;
case 2:
return V4L2_TUNER_MODE_LANG1;
case 3:
return V4L2_TUNER_MODE_LANG2;
default:
return -1;
}
}
/*
** Get current FPS.
*/
static double getfps(priv_t *priv)
{
if (priv->tv_param->fps > 0)
return priv->tv_param->fps;
if (priv->standard.frameperiod.denominator && priv->standard.frameperiod.numerator)
return (double)priv->standard.frameperiod.denominator / priv->standard.frameperiod.numerator;
return 25.0;
}
// sets and sanitizes audio buffer/block sizes
static void setup_audio_buffer_sizes(priv_t *priv)
{
int bytes_per_sample = priv->audio_in.bytes_per_sample;
int seconds = priv->video_buffer_size_max/getfps(priv);
if (seconds < 5) seconds = 5;
if (seconds > 500) seconds = 500;
// make the audio buffer at least as the video buffer capacity (or 5 seconds) long
priv->audio_buffer_size = 1 + seconds*priv->audio_in.samplerate
*priv->audio_in.channels
*bytes_per_sample/priv->audio_in.blocksize;
if (priv->audio_buffer_size < 256) priv->audio_buffer_size = 256;
// make the skew buffer at least 1 second long
priv->aud_skew_cnt = 1 + 1*priv->audio_in.samplerate
*priv->audio_in.channels
*bytes_per_sample/priv->audio_in.blocksize;
if (priv->aud_skew_cnt < 16) priv->aud_skew_cnt = 16;
mp_msg(MSGT_TV, MSGL_V, "Audio capture - buffer %d blocks of %d bytes, skew average from %d meas.\n",
priv->audio_buffer_size, priv->audio_in.blocksize, priv->aud_skew_cnt);
}
static void init_audio(priv_t *priv)
{
if (priv->audio_initialized) return;
if (!priv->tv_param->noaudio) {
#ifdef CONFIG_ALSA
if (priv->tv_param->alsa)
audio_in_init(&priv->audio_in, AUDIO_IN_ALSA);
else
audio_in_init(&priv->audio_in, AUDIO_IN_OSS);
#else
audio_in_init(&priv->audio_in, AUDIO_IN_OSS);
#endif
if (priv->audio_dev) {
audio_in_set_device(&priv->audio_in, priv->audio_dev);
}
audio_in_set_samplerate(&priv->audio_in, 44100);
if (priv->capability.capabilities & V4L2_CAP_TUNER) {
if (priv->tuner.audmode == V4L2_TUNER_MODE_STEREO) {
audio_in_set_channels(&priv->audio_in, 2);
} else {
audio_in_set_channels(&priv->audio_in, 1);
}
} else {
if (priv->tv_param->forcechan >= 0) {
audio_in_set_channels(&priv->audio_in, priv->tv_param->forcechan);
} else {
audio_in_set_channels(&priv->audio_in, 2);
}
}
if (audio_in_setup(&priv->audio_in) < 0) return;
priv->audio_initialized = 1;
}
}
#if 0
/*
** the number of milliseconds elapsed between time0 and time1
*/
static size_t difftv(struct timeval time1, struct timeval time0)
{
return (time1.tv_sec - time0.tv_sec) * 1000 +
(time1.tv_usec - time0.tv_usec) / 1000;
}
#endif
/*
** Get current video capture format.
*/
static int getfmt(priv_t *priv)
{
int i;
priv->format.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
if ((i = ioctl(priv->video_fd, VIDIOC_G_FMT, &priv->format)) < 0) {
mp_msg(MSGT_TV, MSGL_ERR, "%s: ioctl get format failed: %s\n",
info.short_name, strerror(errno));
}
return i;
}
/*
** Get current video capture standard.
*/
static int getstd(priv_t *priv)
{
v4l2_std_id id;
int i=0;
if (ioctl(priv->video_fd, VIDIOC_G_STD, &id) < 0) {
struct v4l2_streamparm parm;
parm.type=V4L2_BUF_TYPE_VIDEO_CAPTURE;
if(ioctl(priv->video_fd, VIDIOC_G_PARM, &parm) >= 0) {
mp_msg(MSGT_TV, MSGL_WARN, "%s: your device driver does not support VIDIOC_G_STD ioctl,"
" VIDIOC_G_PARM was used instead.\n", info.short_name);
priv->standard.index=0;
priv->standard.id=0;
priv->standard.frameperiod=parm.parm.capture.timeperframe;
return 0;
}
mp_msg(MSGT_TV, MSGL_ERR, "%s: ioctl get standard failed: %s\n",
info.short_name, strerror(errno));
return -1;
}
do {
priv->standard.index = i++;
if (ioctl(priv->video_fd, VIDIOC_ENUMSTD, &priv->standard) < 0) {
return -1;
}
} while (priv->standard.id != id);
return 0;
}
/***********************************************************************\
* *
* *
* Interface to mplayer *
* *
* *
\***********************************************************************/
static int set_mute(priv_t *priv, int value)
{
struct v4l2_control control;
control.id = V4L2_CID_AUDIO_MUTE;
control.value = value;
if (ioctl(priv->video_fd, VIDIOC_S_CTRL, &control) < 0) {
mp_msg(MSGT_TV,MSGL_ERR,"%s: ioctl set mute failed: %s\n",
info.short_name, strerror(errno));
return 0;
}
return 1;
}
/*
** MPlayer uses values from -100 up to 100 for controls.
** Here they are scaled to what the tv card needs and applied.
*/
static int set_control(priv_t *priv, struct v4l2_control *control, int val_signed) {
struct v4l2_queryctrl qctrl;
qctrl.id = control->id;
if (ioctl(priv->video_fd, VIDIOC_QUERYCTRL, &qctrl) < 0) {
mp_msg(MSGT_TV, MSGL_ERR, "%s: ioctl query control failed: %s\n",
info.short_name, strerror(errno));
return TVI_CONTROL_FALSE;
}
if (val_signed) {
if (control->value < 0) {
control->value = qctrl.default_value + control->value *
(qctrl.default_value - qctrl.minimum) / 100;
} else {
control->value = qctrl.default_value + control->value *
(qctrl.maximum - qctrl.default_value) / 100;
}
} else {
if (control->value < 50) {
control->value = qctrl.default_value + (control->value-50) *
(qctrl.default_value - qctrl.minimum) / 50;
} else {
control->value = qctrl.default_value + (control->value-50) *
(qctrl.maximum - qctrl.default_value) / 50;
}
}
if (ioctl(priv->video_fd, VIDIOC_S_CTRL, control) < 0) {
mp_msg(MSGT_TV, MSGL_ERR,"%s: ioctl set %s %d failed: %s\n",
info.short_name, qctrl.name, control->value, strerror(errno));
return TVI_CONTROL_FALSE;
}
mp_msg(MSGT_TV, MSGL_V, "%s: set %s: %d [%d, %d]\n", info.short_name,
qctrl.name, control->value, qctrl.minimum, qctrl.maximum);
return TVI_CONTROL_TRUE;
}
/*
** Scale the control values back to what mplayer needs.
*/
static int get_control(priv_t *priv, struct v4l2_control *control, int val_signed) {
struct v4l2_queryctrl qctrl;
qctrl.id = control->id;
if (ioctl(priv->video_fd, VIDIOC_QUERYCTRL, &qctrl) < 0) {
mp_msg(MSGT_TV, MSGL_ERR, "%s: ioctl query control failed: %s\n",
info.short_name, strerror(errno));
return TVI_CONTROL_FALSE;
}
if (ioctl(priv->video_fd, VIDIOC_G_CTRL, control) < 0) {
mp_msg(MSGT_TV, MSGL_ERR,"%s: ioctl get %s failed: %s\n",
info.short_name, qctrl.name, strerror(errno));
return TVI_CONTROL_FALSE;
}
mp_msg(MSGT_TV, MSGL_V, "%s: get %s: %d [%d, %d]\n", info.short_name,
qctrl.name, control->value, qctrl.minimum, qctrl.maximum);
if (val_signed) {
if (control->value < qctrl.default_value) {
control->value = (control->value - qctrl.default_value) * 100 /
(qctrl.default_value - qctrl.minimum);
} else {
control->value = (control->value - qctrl.default_value) * 100 /
(qctrl.maximum - qctrl.default_value);
}
} else {
if (control->value < qctrl.default_value) {
control->value = (control->value - qctrl.default_value) * 50 /
(qctrl.default_value - qctrl.minimum) + 50;
} else {
control->value = (control->value - qctrl.default_value) * 50 /
(qctrl.maximum - qctrl.default_value) + 50;
}
}
return TVI_CONTROL_TRUE;
}
static int vbi_get_props(priv_t* priv,tt_stream_props* ptsp)
{
struct v4l2_format fmt;
int res;
if(!priv || !ptsp)
return TVI_CONTROL_FALSE;
memset(&fmt,0,sizeof(struct v4l2_format));
fmt.type=V4L2_BUF_TYPE_VBI_CAPTURE;
if((res=ioctl(priv->vbi_fd,VIDIOC_G_FMT,&fmt))<0){
mp_msg(MSGT_TV,MSGL_ERR,"vbi_get_props: Query format failed: %x\n",res);
return TVI_CONTROL_FALSE;
}
ptsp->interlaced=(fmt.fmt.vbi.flags& V4L2_VBI_INTERLACED?1:0);
ptsp->offset=fmt.fmt.vbi.offset;
ptsp->sampling_rate=fmt.fmt.vbi.sampling_rate;
ptsp->samples_per_line=fmt.fmt.vbi.samples_per_line,
ptsp->count[0]=fmt.fmt.vbi.count[0];
ptsp->count[1]=fmt.fmt.vbi.count[1];
ptsp->bufsize = ptsp->samples_per_line * (ptsp->count[0] + ptsp->count[1]);
mp_msg(MSGT_TV,MSGL_V,"vbi_get_props: sampling_rate=%d,offset:%d,samples_per_line: %d\n interlaced:%s, count=[%d,%d]\n",
ptsp->sampling_rate,
ptsp->offset,
ptsp->samples_per_line,
ptsp->interlaced?"Yes":"No",
ptsp->count[0],
ptsp->count[1]);
return TVI_CONTROL_TRUE;
}
static void *vbi_grabber(void *data)
{
priv_t *priv = (priv_t *) data;
int bytes,seq,prev_seq;
unsigned char* buf;
tt_stream_props tsp;
if(!priv->priv_vbi){
mp_msg(MSGT_TV,MSGL_WARN,"vbi: vbi not initialized. stopping thread.\n");
return NULL;
}
if(vbi_get_props(priv,&tsp)!=TVI_CONTROL_TRUE)
return NULL;
buf=malloc(tsp.bufsize);
seq=0;
prev_seq=0;
mp_msg(MSGT_TV,MSGL_V,"vbi: vbi capture thread started.\n");
while (!priv->vbi_shutdown){
bytes=read(priv->vbi_fd,buf,tsp.bufsize);
if(bytes<0 && errno==EINTR)
continue;
if (bytes!=tsp.bufsize){
mp_msg(MSGT_TV,MSGL_WARN,"vbi: expecting bytes: %d, got: %d\n",tsp.bufsize,bytes);
break;
}
seq=*(int*)(buf+bytes-4);
if(seq<=1) continue;
if (prev_seq && seq!=prev_seq+1){
prev_seq=0;
seq=0;
}
prev_seq=seq;
mp_msg(MSGT_TV,MSGL_DBG3,"grabber: seq:%d\n",seq);
}
free(buf);
return NULL;
}
static int control(priv_t *priv, int cmd, void *arg)
{
struct v4l2_control control;
struct v4l2_frequency frequency;
switch(cmd) {
case TVI_CONTROL_IS_VIDEO:
return priv->capability.capabilities & V4L2_CAP_VIDEO_CAPTURE?
TVI_CONTROL_TRUE: TVI_CONTROL_FALSE;
case TVI_CONTROL_IS_AUDIO:
if (priv->tv_param->force_audio) return TVI_CONTROL_TRUE;
case TVI_CONTROL_IS_TUNER:
return priv->capability.capabilities & V4L2_CAP_TUNER?
TVI_CONTROL_TRUE: TVI_CONTROL_FALSE;
case TVI_CONTROL_IMMEDIATE:
priv->immediate_mode = 1;
return TVI_CONTROL_TRUE;
case TVI_CONTROL_VID_GET_FPS:
*(float *)arg = getfps(priv);
mp_msg(MSGT_TV, MSGL_V, "%s: get fps: %f\n", info.short_name,
*(float *)arg);
return TVI_CONTROL_TRUE;
case TVI_CONTROL_VID_GET_BITS:
if (getfmt(priv) < 0) return TVI_CONTROL_FALSE;
*(int *)arg = pixfmt2depth(priv->format.fmt.pix.pixelformat);
mp_msg(MSGT_TV, MSGL_V, "%s: get depth: %d\n", info.short_name,
*(int *)arg);
return TVI_CONTROL_TRUE;
case TVI_CONTROL_VID_GET_FORMAT:
if (getfmt(priv) < 0) return TVI_CONTROL_FALSE;
*(int *)arg = fcc_vl2mp(priv->format.fmt.pix.pixelformat);
mp_msg(MSGT_TV, MSGL_V, "%s: get format: %s\n", info.short_name,
pixfmt2name(priv->format.fmt.pix.pixelformat));
return TVI_CONTROL_TRUE;
case TVI_CONTROL_VID_SET_FORMAT:
if (getfmt(priv) < 0) return TVI_CONTROL_FALSE;
priv->format.fmt.pix.pixelformat = fcc_mp2vl(*(int *)arg);
priv->format.fmt.pix.field = V4L2_FIELD_ANY;
priv->mp_format = *(int *)arg;
mp_msg(MSGT_TV, MSGL_V, "%s: set format: %s\n", info.short_name,
pixfmt2name(priv->format.fmt.pix.pixelformat));
if (ioctl(priv->video_fd, VIDIOC_S_FMT, &priv->format) < 0) {
mp_msg(MSGT_TV, MSGL_ERR, "%s: ioctl set format failed: %s\n",
info.short_name, strerror(errno));
return TVI_CONTROL_FALSE;
}
/* according to the v4l2 specs VIDIOC_S_FMT should not fail, inflexible drivers
might even always return the default parameters -> update the format here*/
priv->mp_format = fcc_vl2mp(priv->format.fmt.pix.pixelformat);
return TVI_CONTROL_TRUE;
case TVI_CONTROL_VID_GET_WIDTH:
if (getfmt(priv) < 0) return TVI_CONTROL_FALSE;
*(int *)arg = priv->format.fmt.pix.width;
mp_msg(MSGT_TV, MSGL_V, "%s: get width: %d\n", info.short_name,
*(int *)arg);
return TVI_CONTROL_TRUE;
case TVI_CONTROL_VID_CHK_WIDTH:
return TVI_CONTROL_TRUE;
case TVI_CONTROL_VID_SET_WIDTH_HEIGHT:
if (getfmt(priv) < 0) return TVI_CONTROL_FALSE;
priv->format.fmt.pix.width = ((int *)arg)[0];
priv->format.fmt.pix.height = ((int *)arg)[1];
priv->format.fmt.pix.field = V4L2_FIELD_ANY;
if (ioctl(priv->video_fd, VIDIOC_S_FMT, &priv->format) < 0)
return TVI_CONTROL_FALSE;
return TVI_CONTROL_TRUE;
case TVI_CONTROL_VID_SET_WIDTH:
if (getfmt(priv) < 0) return TVI_CONTROL_FALSE;
priv->format.fmt.pix.width = *(int *)arg;
mp_msg(MSGT_TV, MSGL_V, "%s: set width: %d\n", info.short_name,
*(int *)arg);
if (ioctl(priv->video_fd, VIDIOC_S_FMT, &priv->format) < 0) {
mp_msg(MSGT_TV, MSGL_ERR, "%s: ioctl set width failed: %s\n",
info.short_name, strerror(errno));
return TVI_CONTROL_FALSE;
}
return TVI_CONTROL_TRUE;
case TVI_CONTROL_VID_GET_HEIGHT:
if (getfmt(priv) < 0) return TVI_CONTROL_FALSE;
*(int *)arg = priv->format.fmt.pix.height;
mp_msg(MSGT_TV, MSGL_V, "%s: get height: %d\n", info.short_name,
*(int *)arg);
return TVI_CONTROL_TRUE;
case TVI_CONTROL_VID_CHK_HEIGHT:
return TVI_CONTROL_TRUE;
case TVI_CONTROL_VID_SET_HEIGHT:
if (getfmt(priv) < 0) return TVI_CONTROL_FALSE;
priv->format.fmt.pix.height = *(int *)arg;
priv->format.fmt.pix.field = V4L2_FIELD_ANY;
mp_msg(MSGT_TV, MSGL_V, "%s: set height: %d\n", info.short_name,
*(int *)arg);
if (ioctl(priv->video_fd, VIDIOC_S_FMT, &priv->format) < 0) {
mp_msg(MSGT_TV, MSGL_ERR, "%s: ioctl set height failed: %s\n",
info.short_name, strerror(errno));
return TVI_CONTROL_FALSE;
}
return TVI_CONTROL_TRUE;
case TVI_CONTROL_VID_GET_BRIGHTNESS:
control.id = V4L2_CID_BRIGHTNESS;
if (get_control(priv, &control, 1) == TVI_CONTROL_TRUE) {
*(int *)arg = control.value;
return TVI_CONTROL_TRUE;
}
return TVI_CONTROL_FALSE;
case TVI_CONTROL_VID_SET_BRIGHTNESS:
control.id = V4L2_CID_BRIGHTNESS;
control.value = *(int *)arg;
return set_control(priv, &control, 1);
case TVI_CONTROL_VID_GET_HUE:
control.id = V4L2_CID_HUE;
if (get_control(priv, &control, 1) == TVI_CONTROL_TRUE) {
*(int *)arg = control.value;
return TVI_CONTROL_TRUE;
}
return TVI_CONTROL_FALSE;
case TVI_CONTROL_VID_SET_HUE:
control.id = V4L2_CID_HUE;
control.value = *(int *)arg;
return set_control(priv, &control, 1);
case TVI_CONTROL_VID_GET_SATURATION:
control.id = V4L2_CID_SATURATION;
if (get_control(priv, &control, 1) == TVI_CONTROL_TRUE) {
*(int *)arg = control.value;
return TVI_CONTROL_TRUE;
}
return TVI_CONTROL_FALSE;
case TVI_CONTROL_VID_SET_SATURATION:
control.id = V4L2_CID_SATURATION;
control.value = *(int *)arg;
return set_control(priv, &control, 1);
case TVI_CONTROL_VID_GET_GAIN:
{
control.id = V4L2_CID_AUTOGAIN;
if(get_control(priv,&control,0)!=TVI_CONTROL_TRUE)
return TVI_CONTROL_FALSE;
if(control.value){ //Auto Gain control is enabled
*(int*)arg=0;
return TVI_CONTROL_TRUE;
}
//Manual Gain control
control.id = V4L2_CID_GAIN;
if(get_control(priv,&control,0)!=TVI_CONTROL_TRUE)
return TVI_CONTROL_FALSE;
*(int*)arg=control.value?control.value:1;
return TVI_CONTROL_TRUE;
}
case TVI_CONTROL_VID_SET_GAIN:
{
//value==0 means automatic gain control
int value=*(int*)arg;
if (value < 0 || value>100)
return TVI_CONTROL_FALSE;
control.id=value?V4L2_CID_GAIN:V4L2_CID_AUTOGAIN;
control.value=value?value:1;
return set_control(priv,&control,0);
}
case TVI_CONTROL_VID_GET_CONTRAST:
control.id = V4L2_CID_CONTRAST;
if (get_control(priv, &control, 1) == TVI_CONTROL_TRUE) {
*(int *)arg = control.value;
return TVI_CONTROL_TRUE;
}
return TVI_CONTROL_FALSE;
case TVI_CONTROL_VID_SET_CONTRAST:
control.id = V4L2_CID_CONTRAST;
control.value = *(int *)arg;
return set_control(priv, &control, 1);
case TVI_CONTROL_TUN_GET_FREQ:
frequency.tuner = 0;
frequency.type = V4L2_TUNER_ANALOG_TV;
if (ioctl(priv->video_fd, VIDIOC_G_FREQUENCY, &frequency) < 0) {
mp_msg(MSGT_TV,MSGL_ERR,"%s: ioctl get frequency failed: %s\n",
info.short_name, strerror(errno));
return TVI_CONTROL_FALSE;
}
*(int *)arg = frequency.frequency;
return TVI_CONTROL_TRUE;
case TVI_CONTROL_TUN_SET_FREQ:
#if 0
set_mute(priv, 1);
usleep(100000); // wait to suppress noise during switching
#endif
frequency.tuner = 0;
frequency.type = V4L2_TUNER_ANALOG_TV;
frequency.frequency = *(int *)arg;
if (ioctl(priv->video_fd, VIDIOC_S_FREQUENCY, &frequency) < 0) {
mp_msg(MSGT_TV,MSGL_ERR,"%s: ioctl set frequency failed: %s\n",
info.short_name, strerror(errno));
return TVI_CONTROL_FALSE;
}
#if 0
usleep(100000); // wait to suppress noise during switching
set_mute(priv, 0);
#endif
return TVI_CONTROL_TRUE;
case TVI_CONTROL_TUN_GET_TUNER:
mp_msg(MSGT_TV, MSGL_V, "%s: get tuner\n",info.short_name);
if (ioctl(priv->video_fd, VIDIOC_G_TUNER, &priv->tuner) < 0) {
mp_msg(MSGT_TV, MSGL_ERR, "%s: ioctl get tuner failed: %s\n",
info.short_name, strerror(errno));
return TVI_CONTROL_FALSE;
}
return TVI_CONTROL_TRUE;
case TVI_CONTROL_TUN_SET_TUNER:
mp_msg(MSGT_TV, MSGL_V, "%s: set tuner\n",info.short_name);
if (ioctl(priv->video_fd, VIDIOC_S_TUNER, &priv->tuner) < 0) {
mp_msg(MSGT_TV, MSGL_ERR, "%s: ioctl set tuner failed: %s\n",
info.short_name, strerror(errno));
return TVI_CONTROL_FALSE;
}
return TVI_CONTROL_TRUE;
case TVI_CONTROL_TUN_GET_NORM:
*(int *)arg = priv->standard.index;
return TVI_CONTROL_TRUE;
case TVI_CONTROL_TUN_GET_SIGNAL:
if (ioctl(priv->video_fd, VIDIOC_G_TUNER, &priv->tuner) < 0) {
mp_msg(MSGT_TV, MSGL_ERR, "%s: ioctl get tuner failed: %s\n",
info.short_name, strerror(errno));
return TVI_CONTROL_FALSE;
}
*(int*)arg=100*(priv->tuner.signal>>8)/255;
return TVI_CONTROL_TRUE;
case TVI_CONTROL_TUN_SET_NORM:
priv->standard.index = *(int *)arg;
if (ioctl(priv->video_fd, VIDIOC_ENUMSTD, &priv->standard) < 0) {
mp_msg(MSGT_TV, MSGL_ERR, "%s: ioctl enum norm failed: %s\n",
info.short_name, strerror(errno));
return TVI_CONTROL_FALSE;
}
mp_msg(MSGT_TV, MSGL_V, "%s: set norm: %s\n", info.short_name, priv->standard.name);
if (ioctl(priv->video_fd, VIDIOC_S_STD, &priv->standard.id) < 0) {
mp_msg(MSGT_TV, MSGL_ERR, "%s: ioctl set norm failed: %s\n",
info.short_name, strerror(errno));
return TVI_CONTROL_FALSE;
}
return TVI_CONTROL_TRUE;
case TVI_CONTROL_SPC_GET_NORMID:
{
int i;
for (i = 0;; i++) {
struct v4l2_standard standard;
memset(&standard, 0, sizeof(standard));
standard.index = i;
if (-1 == ioctl(priv->video_fd, VIDIOC_ENUMSTD, &standard))
return TVI_CONTROL_FALSE;
if (!strcasecmp(standard.name, (char *)arg)) {
*(int *)arg = i;
return TVI_CONTROL_TRUE;
}
}
return TVI_CONTROL_FALSE;
}
case TVI_CONTROL_SPC_GET_INPUT:
if (ioctl(priv->video_fd, VIDIOC_G_INPUT, (int *)arg) < 0) {
mp_msg(MSGT_TV, MSGL_ERR, "%s: ioctl get input failed: %s\n",
info.short_name, strerror(errno));
return TVI_CONTROL_FALSE;
}
return TVI_CONTROL_TRUE;
case TVI_CONTROL_SPC_SET_INPUT:
mp_msg(MSGT_TV, MSGL_V, "%s: set input: %d\n", info.short_name, *(int *)arg);
priv->input.index = *(int *)arg;
if (ioctl(priv->video_fd, VIDIOC_ENUMINPUT, &priv->input) < 0) {
mp_msg(MSGT_TV, MSGL_ERR, "%s: ioctl enum input failed: %s\n",
info.short_name, strerror(errno));
return TVI_CONTROL_FALSE;
}
if (ioctl(priv->video_fd, VIDIOC_S_INPUT, (int *)arg) < 0) {
mp_msg(MSGT_TV, MSGL_ERR, "%s: ioctl set input failed: %s\n",
info.short_name, strerror(errno));
return TVI_CONTROL_FALSE;
}
return TVI_CONTROL_TRUE;
case TVI_CONTROL_AUD_GET_FORMAT:
init_audio(priv);
if (!priv->audio_initialized) return TVI_CONTROL_FALSE;
*(int *)arg = AF_FORMAT_S16_LE;
mp_msg(MSGT_TV, MSGL_V, "%s: get audio format: %d\n",
info.short_name, *(int *)arg);
return TVI_CONTROL_TRUE;
case TVI_CONTROL_AUD_GET_SAMPLERATE:
init_audio(priv);
if (!priv->audio_initialized) return TVI_CONTROL_FALSE;
*(int *)arg = priv->audio_in.samplerate;
mp_msg(MSGT_TV, MSGL_V, "%s: get audio samplerate: %d\n",
info.short_name, *(int *)arg);
return TVI_CONTROL_TRUE;
case TVI_CONTROL_AUD_GET_SAMPLESIZE:
init_audio(priv);
if (!priv->audio_initialized) return TVI_CONTROL_FALSE;
*(int *)arg = priv->audio_in.bytes_per_sample;
mp_msg(MSGT_TV, MSGL_V, "%s: get audio samplesize: %d\n",
info.short_name, *(int *)arg);
return TVI_CONTROL_TRUE;
case TVI_CONTROL_AUD_GET_CHANNELS:
init_audio(priv);
if (!priv->audio_initialized) return TVI_CONTROL_FALSE;
*(int *)arg = priv->audio_in.channels;
mp_msg(MSGT_TV, MSGL_V, "%s: get audio channels: %d\n",
info.short_name, *(int *)arg);
return TVI_CONTROL_TRUE;
case TVI_CONTROL_AUD_SET_SAMPLERATE:
init_audio(priv);
mp_msg(MSGT_TV, MSGL_V, "%s: set audio samplerate: %d\n",
info.short_name, *(int *)arg);
if (audio_in_set_samplerate(&priv->audio_in, *(int*)arg) < 0) return TVI_CONTROL_FALSE;
// setup_audio_buffer_sizes(priv);
return TVI_CONTROL_TRUE;
}
mp_msg(MSGT_TV, MSGL_V, "%s: unknown control: %d\n", info.short_name, cmd);
return TVI_CONTROL_UNKNOWN;
}
#define PRIV ((priv_t *) (tvi_handle->priv))
/* handler creator - entry point ! */
static tvi_handle_t *tvi_init_v4l2(tv_param_t* tv_param)
{
tvi_handle_t *tvi_handle;
tvi_handle = tv_new_handle(sizeof(priv_t), &functions);
if (!tvi_handle) {
return NULL;
}
PRIV->video_fd = -1;
PRIV->video_dev = strdup(tv_param->device? tv_param->device: "/dev/video0");
if (!PRIV->video_dev) {
tv_free_handle(tvi_handle);
return NULL;
}
if (tv_param->adevice) {
PRIV->audio_dev = strdup(tv_param->adevice);
if (!PRIV->audio_dev) {
free(PRIV->video_dev);
tv_free_handle(tvi_handle);
return NULL;
}
}
PRIV->tv_param=tv_param;
return tvi_handle;
}
#undef PRIV
static int uninit(priv_t *priv)
{
int i, frames, dropped = 0;
priv->vbi_shutdown=1;
if(priv->vbi_grabber_thread)
pthread_join(priv->vbi_grabber_thread, NULL);
priv->priv_vbi=NULL;
if(priv->vbi_fd){
close(priv->vbi_fd);
priv->vbi_fd=0;
}
free(priv->vbi_dev);
priv->vbi_dev = NULL;
priv->shutdown = 1;
if(priv->video_grabber_thread)
pthread_join(priv->video_grabber_thread, NULL);
pthread_mutex_destroy(&priv->video_buffer_mutex);
if (priv->streamon) {
struct v4l2_buffer buf;
/* get performance */
frames = 1 + lrintf((double)(priv->curr_frame - priv->first_frame) / 1e6 * getfps(priv));
dropped = frames - priv->frames;
/* turn off streaming */
if (ioctl(priv->video_fd, VIDIOC_STREAMOFF, &(priv->map[0].buf.type)) < 0) {
mp_msg(MSGT_TV, MSGL_ERR, "%s: ioctl streamoff failed: %s\n",
info.short_name, strerror(errno));
}
priv->streamon = 0;
/* unqueue all remaining buffers */
memset(&buf,0,sizeof(buf));
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buf.memory = V4L2_MEMORY_MMAP;
while (!ioctl(priv->video_fd, VIDIOC_DQBUF, &buf));
}
/* unmap all buffers */
for (i = 0; i < priv->mapcount; i++) {
if (munmap(priv->map[i].addr, priv->map[i].len) < 0) {
mp_msg(MSGT_TV, MSGL_ERR, "%s: munmap capture buffer failed: %s\n",
info.short_name, strerror(errno));
}
}
/* stop audio thread */
if (!priv->tv_param->noaudio && priv->audio_grabber_thread) {
pthread_join(priv->audio_grabber_thread, NULL);
pthread_mutex_destroy(&priv->skew_mutex);
pthread_mutex_destroy(&priv->audio_mutex);
}
set_mute(priv, 1);
/* free memory and close device */
free(priv->map); priv->map = NULL;
priv->mapcount = 0;
if(priv->video_fd!=-1)close(priv->video_fd); priv->video_fd = -1;
free(priv->video_dev); priv->video_dev = NULL;
if (priv->video_ringbuffer) {
for (int n = 0; n < priv->video_buffer_size_current; n++) {
free(priv->video_ringbuffer[n].data);
}
free(priv->video_ringbuffer);
}
if (!priv->tv_param->noaudio) {
free(priv->audio_ringbuffer);
free(priv->audio_skew_buffer);
free(priv->audio_skew_delta_buffer);
audio_in_uninit(&priv->audio_in);
}
/* show some nice statistics ;-) */
mp_msg(MSGT_TV, MSGL_INFO,
"%s: %d frames successfully processed, %d frames dropped.\n",
info.short_name, priv->frames, dropped);
mp_msg(MSGT_TV, MSGL_V, "%s: up to %u video frames buffered.\n",
info.short_name, priv->video_buffer_size_current);
return 1;
}
/* initialisation */
static int init(priv_t *priv)
{
int i;
priv->audio_ringbuffer = NULL;
priv->audio_skew_buffer = NULL;
priv->audio_skew_delta_buffer = NULL;
priv->audio_initialized = 0;
/* Open the video device. */
priv->video_fd = open(priv->video_dev, O_RDWR);
if (priv->video_fd < 0) {
mp_msg(MSGT_TV, MSGL_ERR, "%s: unable to open '%s': %s\n",
info.short_name, priv->video_dev, strerror(errno));
uninit(priv);
return 0;
}
mp_msg(MSGT_TV, MSGL_DBG2, "%s: video fd: %s: %d\n",
info.short_name, priv->video_dev, priv->video_fd);
/*
** Query the video capabilities and current settings
** for further control calls.
*/
if (ioctl(priv->video_fd, VIDIOC_QUERYCAP, &priv->capability) < 0) {
mp_msg(MSGT_TV, MSGL_ERR, "%s: ioctl query capabilities failed: %s\n",
info.short_name, strerror(errno));
uninit(priv);
return 0;
}
if (!(priv->capability.capabilities & V4L2_CAP_VIDEO_CAPTURE))
{
mp_msg(MSGT_TV, MSGL_ERR, "Device %s is not a video capture device.\n",
priv->video_dev);
return 0;
}
if (getfmt(priv) < 0) {
uninit(priv);
return 0;
}
getstd(priv);
/*
** if this device has got a tuner query it's settings
** otherwise set some nice defaults
*/
if (priv->capability.capabilities & V4L2_CAP_TUNER) {
if (ioctl(priv->video_fd, VIDIOC_G_TUNER, &priv->tuner) < 0) {
mp_msg(MSGT_TV, MSGL_ERR, "%s: ioctl get tuner failed: %s\n",
info.short_name, strerror(errno));
uninit(priv);
return 0;
}
}
mp_msg(MSGT_TV, MSGL_INFO, "Selected device: %s\n", priv->capability.card);
if (priv->capability.capabilities & V4L2_CAP_TUNER) {
mp_msg(MSGT_TV, MSGL_INFO, " Tuner cap:%s%s%s\n",
(priv->tuner.capability & V4L2_TUNER_CAP_STEREO) ? " STEREO" : "",
(priv->tuner.capability & V4L2_TUNER_CAP_LANG1) ? " LANG1" : "",
(priv->tuner.capability & V4L2_TUNER_CAP_LANG2) ? " LANG2" : "");
mp_msg(MSGT_TV, MSGL_INFO, " Tuner rxs:%s%s%s%s\n",
(priv->tuner.rxsubchans & V4L2_TUNER_SUB_MONO) ? " MONO" : "",
(priv->tuner.rxsubchans & V4L2_TUNER_SUB_STEREO) ? " STEREO" : "",
(priv->tuner.rxsubchans & V4L2_TUNER_SUB_LANG1) ? " LANG1" : "",
(priv->tuner.rxsubchans & V4L2_TUNER_SUB_LANG2) ? " LANG2" : "");
}
mp_msg(MSGT_TV, MSGL_INFO, " Capabilities:%s%s%s%s%s%s%s%s%s%s%s\n",
priv->capability.capabilities & V4L2_CAP_VIDEO_CAPTURE?
" video capture": "",
priv->capability.capabilities & V4L2_CAP_VIDEO_OUTPUT?
" video output": "",
priv->capability.capabilities & V4L2_CAP_VIDEO_OVERLAY?
" video overlay": "",
priv->capability.capabilities & V4L2_CAP_VBI_CAPTURE?
" VBI capture device": "",
priv->capability.capabilities & V4L2_CAP_VBI_OUTPUT?
" VBI output": "",
priv->capability.capabilities & V4L2_CAP_RDS_CAPTURE?
" RDS data capture": "",
priv->capability.capabilities & V4L2_CAP_TUNER?
" tuner": "",
priv->capability.capabilities & V4L2_CAP_AUDIO?
" audio": "",
priv->capability.capabilities & V4L2_CAP_READWRITE?
" read/write": "",
priv->capability.capabilities & V4L2_CAP_ASYNCIO?
" async i/o": "",
priv->capability.capabilities & V4L2_CAP_STREAMING?
" streaming": "");
mp_msg(MSGT_TV, MSGL_INFO, " supported norms:");
for (i = 0;; i++) {
struct v4l2_standard standard;
memset(&standard, 0, sizeof(standard));
standard.index = i;
if (-1 == ioctl(priv->video_fd, VIDIOC_ENUMSTD, &standard))
break;
mp_msg(MSGT_TV, MSGL_INFO, " %d = %s;", i, standard.name);
}
mp_msg(MSGT_TV, MSGL_INFO, "\n inputs:");
for (i = 0; 1; i++) {
struct v4l2_input input;
input.index = i;
if (ioctl(priv->video_fd, VIDIOC_ENUMINPUT, &input) < 0) {
break;
}
mp_msg(MSGT_TV, MSGL_INFO, " %d = %s;", i, input.name);
}
i = -1;
if (ioctl(priv->video_fd, VIDIOC_G_INPUT, &i) < 0) {
mp_msg(MSGT_TV, MSGL_ERR, "%s: ioctl get input failed: %s\n",
info.short_name, strerror(errno));
}
mp_msg(MSGT_TV, MSGL_INFO, "\n Current input: %d\n", i);
for (i = 0; ; i++) {
struct v4l2_fmtdesc fmtdesc;
fmtdesc.index = i;
fmtdesc.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
if (ioctl(priv->video_fd, VIDIOC_ENUM_FMT, &fmtdesc) < 0) {
break;
}
mp_msg(MSGT_TV, MSGL_V, " Format %-6s (%2d bits, %s)\n",
pixfmt2name(fmtdesc.pixelformat), pixfmt2depth(fmtdesc.pixelformat),
fmtdesc.description);
}
mp_msg(MSGT_TV, MSGL_INFO, " Current format: %s\n",
pixfmt2name(priv->format.fmt.pix.pixelformat));
/* set some nice defaults */
if (getfmt(priv) < 0) return 0;
priv->format.fmt.pix.width = 640;
priv->format.fmt.pix.height = 480;
if (ioctl(priv->video_fd, VIDIOC_S_FMT, &priv->format) < 0) {
mp_msg(MSGT_TV, MSGL_ERR, "%s: ioctl set format failed: %s\n",
info.short_name, strerror(errno));
uninit(priv);
return 0;
}
// if (!(priv->capability.capabilities & V4L2_CAP_AUDIO) && !priv->tv_param->force_audio) priv->tv_param->noaudio = 1;
if (priv->capability.capabilities & V4L2_CAP_TUNER) {
struct v4l2_control control;
if (priv->tv_param->amode >= 0) {
mp_msg(MSGT_TV, MSGL_V, "%s: setting audio mode\n", info.short_name);
priv->tuner.audmode = amode2v4l(priv->tv_param->amode);
if (ioctl(priv->video_fd, VIDIOC_S_TUNER, &priv->tuner) < 0) {
mp_msg(MSGT_TV, MSGL_ERR, "%s: ioctl set tuner failed: %s\n",
info.short_name, strerror(errno));
return TVI_CONTROL_FALSE;
}
}
mp_msg(MSGT_TV, MSGL_INFO, "%s: current audio mode is :%s%s%s%s\n", info.short_name,
(priv->tuner.audmode == V4L2_TUNER_MODE_MONO) ? " MONO" : "",
(priv->tuner.audmode == V4L2_TUNER_MODE_STEREO) ? " STEREO" : "",
(priv->tuner.audmode == V4L2_TUNER_MODE_LANG1) ? " LANG1" : "",
(priv->tuner.audmode == V4L2_TUNER_MODE_LANG2) ? " LANG2" : "");
if (priv->tv_param->volume >= 0) {
control.id = V4L2_CID_AUDIO_VOLUME;
control.value = priv->tv_param->volume;
set_control(priv, &control, 0);
}
if (priv->tv_param->bass >= 0) {
control.id = V4L2_CID_AUDIO_BASS;
control.value = priv->tv_param->bass;
set_control(priv, &control, 0);
}
if (priv->tv_param->treble >= 0) {
control.id = V4L2_CID_AUDIO_TREBLE;
control.value = priv->tv_param->treble;
set_control(priv, &control, 0);
}
if (priv->tv_param->balance >= 0) {
control.id = V4L2_CID_AUDIO_BALANCE;
control.value = priv->tv_param->balance;
set_control(priv, &control, 0);
}
}
return 1;
}
static int get_capture_buffer_size(priv_t *priv)
{
uint64_t bufsize;
int cnt;
if (priv->tv_param->buffer_size >= 0) {
bufsize = priv->tv_param->buffer_size*1024*1024;
} else {
#ifdef HAVE_SYS_SYSINFO_H
struct sysinfo si;
sysinfo(&si);
bufsize = (si.freeram/2)*si.mem_unit;
if ( bufsize < 16*1024*1024)
#endif
bufsize = 16*1024*1024;
}
cnt = bufsize/priv->format.fmt.pix.sizeimage;
if (cnt < 2) cnt = 2;
return cnt;
}
/* that's the real start, we'got the format parameters (checked with control) */
static int start(priv_t *priv)
{
struct v4l2_requestbuffers request;
unsigned int i;
/* setup audio parameters */
init_audio(priv);
if (!priv->tv_param->noaudio && !priv->audio_initialized) return 0;
/* we need this to size the audio buffer properly */
if (priv->immediate_mode) {
priv->video_buffer_size_max = 2;
} else {
priv->video_buffer_size_max = get_capture_buffer_size(priv);
}
if (!priv->tv_param->noaudio) {
setup_audio_buffer_sizes(priv);
priv->audio_skew_buffer = calloc(priv->aud_skew_cnt, sizeof(long long));
if (!priv->audio_skew_buffer) {
mp_msg(MSGT_TV, MSGL_ERR, "cannot allocate skew buffer: %s\n", strerror(errno));
return 0;
}
priv->audio_skew_delta_buffer = calloc(priv->aud_skew_cnt, sizeof(long long));
if (!priv->audio_skew_delta_buffer) {
mp_msg(MSGT_TV, MSGL_ERR, "cannot allocate skew buffer: %s\n", strerror(errno));
return 0;
}
priv->audio_ringbuffer = calloc(priv->audio_in.blocksize, priv->audio_buffer_size);
if (!priv->audio_ringbuffer) {
mp_msg(MSGT_TV, MSGL_ERR, "cannot allocate audio buffer: %s\n", strerror(errno));
return 0;
}
priv->audio_secs_per_block = (double)priv->audio_in.blocksize/(priv->audio_in.samplerate
*priv->audio_in.channels
*priv->audio_in.bytes_per_sample);
priv->audio_usecs_per_block = 1e6*priv->audio_secs_per_block;
priv->audio_head = 0;
priv->audio_tail = 0;
priv->audio_cnt = 0;
priv->audio_drop = 0;
priv->audio_skew = 0;
priv->audio_skew_total = 0;
priv->audio_skew_delta_total = 0;
priv->audio_recv_blocks_total = 0;
priv->audio_sent_blocks_total = 0;
priv->audio_null_blocks_inserted = 0;
priv->audio_insert_null_samples = 0;
priv->dropped_frames_timeshift = 0;
priv->dropped_frames_compensated = 0;
pthread_mutex_init(&priv->skew_mutex, NULL);
pthread_mutex_init(&priv->audio_mutex, NULL);
}
/* setup video parameters */
if (!priv->tv_param->noaudio) {
if (priv->video_buffer_size_max < 3*getfps(priv)*priv->audio_secs_per_block) {
mp_msg(MSGT_TV, MSGL_ERR, "Video buffer shorter than 3 times audio frame duration.\n"
"You will probably experience heavy framedrops.\n");
}
}
{
int bytesperline = priv->format.fmt.pix.width*pixfmt2depth(priv->format.fmt.pix.pixelformat)/8;
mp_msg(MSGT_TV, MSGL_V, "Using a ring buffer for maximum %d frames, %d MB total size.\n",
priv->video_buffer_size_max,
priv->video_buffer_size_max*priv->format.fmt.pix.height*bytesperline/(1024*1024));
}
priv->video_ringbuffer = calloc(priv->video_buffer_size_max, sizeof(video_buffer_entry));
if (!priv->video_ringbuffer) {
mp_msg(MSGT_TV, MSGL_ERR, "cannot allocate video buffer: %s\n", strerror(errno));
return 0;
}
memset(priv->video_ringbuffer,0,priv->video_buffer_size_max * sizeof(video_buffer_entry));
pthread_mutex_init(&priv->video_buffer_mutex, NULL);
priv->video_head = 0;
priv->video_tail = 0;
priv->video_cnt = 0;
/* request buffers */
if (priv->immediate_mode) {
request.count = 2;
} else {
request.count = BUFFER_COUNT;
}
request.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
request.memory = V4L2_MEMORY_MMAP;
if (ioctl(priv->video_fd, VIDIOC_REQBUFS, &request) < 0) {
mp_msg(MSGT_TV, MSGL_ERR, "%s: ioctl request buffers failed: %s\n",
info.short_name, strerror(errno));
return 0;
}
/* query buffers */
if (!(priv->map = calloc(request.count, sizeof(struct map)))) {
mp_msg(MSGT_TV, MSGL_ERR, "%s: malloc capture buffers failed: %s\n",
info.short_name, strerror(errno));
return 0;
}
/* map and queue buffers */
for (i = 0; i < request.count; i++) {
memset(&priv->map[i].buf,0,sizeof(priv->map[i].buf));
priv->map[i].buf.index = i;
priv->map[i].buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
priv->map[i].buf.memory = V4L2_MEMORY_MMAP;
if (ioctl(priv->video_fd, VIDIOC_QUERYBUF, &(priv->map[i].buf)) < 0) {
mp_msg(MSGT_TV, MSGL_ERR, "%s: ioctl query buffer failed: %s\n",
info.short_name, strerror(errno));
free(priv->map);
priv->map = NULL;
return 0;
}
priv->map[i].addr = mmap (0, priv->map[i].buf.length, PROT_READ |
PROT_WRITE, MAP_SHARED, priv->video_fd, priv->map[i].buf.m.offset);
if (priv->map[i].addr == MAP_FAILED) {
mp_msg(MSGT_TV, MSGL_ERR, "%s: mmap capture buffer failed: %s\n",
info.short_name, strerror(errno));
priv->map[i].len = 0;
return 0;
}
priv->map[i].len = priv->map[i].buf.length;
/* count up to make sure this is correct everytime */
priv->mapcount++;
if (ioctl(priv->video_fd, VIDIOC_QBUF, &(priv->map[i].buf)) < 0) {
mp_msg(MSGT_TV, MSGL_ERR, "%s: ioctl queue buffer failed: %s\n",
info.short_name, strerror(errno));
return 0;
}
}
/* start vbi thread */
if(priv->priv_vbi){
priv->vbi_shutdown = 0;
pthread_create(&priv->vbi_grabber_thread, NULL, vbi_grabber, priv);
}
/* start audio thread */
priv->shutdown = 0;
priv->audio_skew_measure_time = 0;
priv->first_frame = 0;
priv->audio_skew = 0;
priv->first = 1;
set_mute(priv, 0);
return 1;
}
// copies a video frame
static inline void copy_frame(priv_t *priv, video_buffer_entry *dest, unsigned char *source,int len)
{
dest->framesize=len;
if(priv->tv_param->automute>0){
if (ioctl(priv->video_fd, VIDIOC_G_TUNER, &priv->tuner) >= 0) {
if(priv->tv_param->automute<<8>priv->tuner.signal){
fill_blank_frame(dest->data,dest->framesize,fcc_vl2mp(priv->format.fmt.pix.pixelformat));
set_mute(priv,1);
return;
}
}
set_mute(priv,0);
}
memcpy(dest->data, source, len);
}
// maximum skew change, in frames
#define MAX_SKEW_DELTA 0.6
static void *video_grabber(void *data)
{
priv_t *priv = (priv_t*)data;
long long skew, prev_skew, xskew, interval, prev_interval, delta;
int i;
int framesize = priv->format.fmt.pix.sizeimage;
fd_set rdset;
struct timeval timeout;
struct v4l2_buffer buf;
xskew = 0;
skew = 0;
interval = 0;
prev_interval = 0;
prev_skew = 0;
mp_msg(MSGT_TV, MSGL_V, "%s: going to capture\n", info.short_name);
if (ioctl(priv->video_fd, VIDIOC_STREAMON, &(priv->format.type)) < 0) {
mp_msg(MSGT_TV, MSGL_ERR, "%s: ioctl streamon failed: %s\n",
info.short_name, strerror(errno));
return 0;
}
priv->streamon = 1;
if (!priv->tv_param->noaudio) {
pthread_create(&priv->audio_grabber_thread, NULL, audio_grabber, priv);
}
for (priv->frames = 0; !priv->shutdown;)
{
int ret;
if (priv->immediate_mode) {
while (priv->video_cnt == priv->video_buffer_size_max) {
usleep(10000);
if (priv->shutdown) {
return NULL;
}
}
}
FD_ZERO (&rdset);
FD_SET (priv->video_fd, &rdset);
timeout.tv_sec = 1;
timeout.tv_usec = 0;
i = select(priv->video_fd + 1, &rdset, NULL, NULL, &timeout);
if (i < 0) {
mp_msg(MSGT_TV, MSGL_ERR, "%s: select failed: %s\n",
info.short_name, strerror(errno));
continue;
}
else if (i == 0) {
mp_msg(MSGT_TV, MSGL_ERR, "%s: select timeout\n", info.short_name);
continue;
}
else if (!FD_ISSET(priv->video_fd, &rdset)) {
continue;
}
memset(&buf,0,sizeof(buf));
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buf.memory = V4L2_MEMORY_MMAP;
ret = ioctl(priv->video_fd, VIDIOC_DQBUF, &buf);
if (ret < 0) {
/*
if there's no signal, the buffer might me dequeued
so we query all the buffers to see which one we should
put back to queue
observed with saa7134 0.2.8
don't know if is it a bug or (mis)feature
*/
mp_msg(MSGT_TV, MSGL_ERR, "%s: ioctl dequeue buffer failed: %s, idx = %d\n",
info.short_name, strerror(errno), buf.index);
for (i = 0; i < priv->mapcount; i++) {
memset(&buf,0,sizeof(buf));
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buf.memory = V4L2_MEMORY_MMAP;
buf.index = i;
ret = ioctl(priv->video_fd, VIDIOC_QUERYBUF, &buf);
if (ret < 0) {
mp_msg(MSGT_TV, MSGL_ERR, "%s: ioctl query buffer failed: %s, idx = %d\n",
info.short_name, strerror(errno), buf.index);
return 0;
}
if ((buf.flags & (V4L2_BUF_FLAG_QUEUED | V4L2_BUF_FLAG_MAPPED | V4L2_BUF_FLAG_DONE)) == V4L2_BUF_FLAG_MAPPED) {
if (ioctl(priv->video_fd, VIDIOC_QBUF, &(priv->map[i].buf)) < 0) {
mp_msg(MSGT_TV, MSGL_ERR, "%s: ioctl queue buffer failed: %s\n",
info.short_name, strerror(errno));
return 0;
}
}
}
continue;
}
/* store the timestamp of the very first frame as reference */
if (!priv->frames++) {
if (!priv->tv_param->noaudio) pthread_mutex_lock(&priv->skew_mutex);
priv->first_frame = (long long)1e6*buf.timestamp.tv_sec + buf.timestamp.tv_usec;
if (!priv->tv_param->noaudio) pthread_mutex_unlock(&priv->skew_mutex);
}
priv->curr_frame = (long long)buf.timestamp.tv_sec*1e6+buf.timestamp.tv_usec;
// fprintf(stderr, "idx = %d, ts = %f\n", buf.index, (double)(priv->curr_frame) / 1e6);
interval = priv->curr_frame - priv->first_frame;
delta = interval - prev_interval;
if (!priv->immediate_mode) {
// interpolate the skew in time
if (!priv->tv_param->noaudio) pthread_mutex_lock(&priv->skew_mutex);
xskew = priv->audio_skew + (interval - priv->audio_skew_measure_time)*priv->audio_skew_factor;
if (!priv->tv_param->noaudio) pthread_mutex_unlock(&priv->skew_mutex);
// correct extreme skew changes to avoid (especially) moving backwards in time
if (xskew - prev_skew > delta*MAX_SKEW_DELTA) {
skew = prev_skew + delta*MAX_SKEW_DELTA;
} else if (xskew - prev_skew < -delta*MAX_SKEW_DELTA) {
skew = prev_skew - delta*MAX_SKEW_DELTA;
} else {
skew = xskew;
}
}
mp_msg(MSGT_TV, MSGL_DBG3, "\nfps = %f, interval = %f, a_skew = %f, corr_skew = %f\n",
delta ? (double)1e6/delta : -1,
(double)1e-6*interval, (double)1e-6*xskew, (double)1e-6*skew);
mp_msg(MSGT_TV, MSGL_DBG3, "vcnt = %d, acnt = %d\n", priv->video_cnt, priv->audio_cnt);
prev_skew = skew;
prev_interval = interval;
/* allocate a new buffer, if needed */
pthread_mutex_lock(&priv->video_buffer_mutex);
if (priv->video_buffer_size_current < priv->video_buffer_size_max) {
if (priv->video_cnt == priv->video_buffer_size_current) {
unsigned char *newbuf = malloc(framesize);
if (newbuf) {
memmove(priv->video_ringbuffer+priv->video_tail+1, priv->video_ringbuffer+priv->video_tail,
(priv->video_buffer_size_current-priv->video_tail)*sizeof(video_buffer_entry));
priv->video_ringbuffer[priv->video_tail].data = newbuf;
if ((priv->video_head >= priv->video_tail) && (priv->video_cnt > 0)) priv->video_head++;
priv->video_buffer_size_current++;
}
}
}
pthread_mutex_unlock(&priv->video_buffer_mutex);
if (priv->video_cnt == priv->video_buffer_size_current) {
if (!priv->immediate_mode) {
mp_msg(MSGT_TV, MSGL_ERR, "\nvideo buffer full - dropping frame\n");
if (priv->audio_insert_null_samples) {
pthread_mutex_lock(&priv->audio_mutex);
priv->dropped_frames_timeshift += delta;
pthread_mutex_unlock(&priv->audio_mutex);
}
}
} else {
if (priv->immediate_mode) {
priv->video_ringbuffer[priv->video_tail].timestamp = 0;
} else {
// compensate for audio skew
// negative skew => there are more audio samples, increase interval
// positive skew => less samples, shorten the interval
priv->video_ringbuffer[priv->video_tail].timestamp = interval - skew;
if (priv->audio_insert_null_samples && priv->video_ringbuffer[priv->video_tail].timestamp > 0) {
pthread_mutex_lock(&priv->audio_mutex);
priv->video_ringbuffer[priv->video_tail].timestamp +=
(priv->audio_null_blocks_inserted
- priv->dropped_frames_timeshift/priv->audio_usecs_per_block)
*priv->audio_usecs_per_block;
pthread_mutex_unlock(&priv->audio_mutex);
}
}
copy_frame(priv, priv->video_ringbuffer+priv->video_tail, priv->map[buf.index].addr,buf.bytesused);
priv->video_tail = (priv->video_tail+1)%priv->video_buffer_size_current;
priv->video_cnt++;
}
if (ioctl(priv->video_fd, VIDIOC_QBUF, &buf) < 0) {
mp_msg(MSGT_TV, MSGL_ERR, "%s: ioctl queue buffer failed: %s\n",
info.short_name, strerror(errno));
return 0;
}
}
return NULL;
}
#define MAX_LOOP 50
static double grab_video_frame(priv_t *priv, char *buffer, int len)
{
double interval;
int loop_cnt = 0;
if (priv->first) {
pthread_create(&priv->video_grabber_thread, NULL, video_grabber, priv);
priv->first = 0;
}
while (priv->video_cnt == 0) {
usleep(10000);
if (loop_cnt++ > MAX_LOOP) return 0;
}
pthread_mutex_lock(&priv->video_buffer_mutex);
interval = (double)priv->video_ringbuffer[priv->video_head].timestamp*1e-6;
memcpy(buffer, priv->video_ringbuffer[priv->video_head].data, len);
priv->video_cnt--;
priv->video_head = (priv->video_head+1)%priv->video_buffer_size_current;
pthread_mutex_unlock(&priv->video_buffer_mutex);
return interval;
}
static int get_video_framesize(priv_t *priv)
{
/*
this routine will be called before grab_video_frame
thus let's return topmost frame's size
*/
if (priv->video_cnt)
return priv->video_ringbuffer[priv->video_head].framesize;
/*
no video frames yet available. i don't know what to do in this case,
thus let's return some fallback result (for compressed format this will be
maximum allowed frame size.
*/
return priv->format.fmt.pix.sizeimage;
}
static void *audio_grabber(void *data)
{
priv_t *priv = (priv_t*)data;
struct timeval tv;
int i, audio_skew_ptr = 0;
long long current_time, prev_skew = 0, prev_skew_uncorr = 0;
long long start_time_avg;
gettimeofday(&tv, NULL);
start_time_avg = priv->audio_start_time = (long long)1e6*tv.tv_sec + tv.tv_usec;
audio_in_start_capture(&priv->audio_in);
for (i = 0; i < priv->aud_skew_cnt; i++)
priv->audio_skew_buffer[i] = 0;
for (i = 0; i < priv->aud_skew_cnt; i++)
priv->audio_skew_delta_buffer[i] = 0;
for (; !priv->shutdown;)
{
if (audio_in_read_chunk(&priv->audio_in, priv->audio_ringbuffer+priv->audio_tail*priv->audio_in.blocksize) < 0)
continue;
pthread_mutex_lock(&priv->skew_mutex);
if (priv->first_frame == 0) {
// there is no first frame yet (unlikely to happen)
gettimeofday(&tv, NULL);
start_time_avg = priv->audio_start_time = (long long)1e6*tv.tv_sec + tv.tv_usec;
// fprintf(stderr, "warning - first frame not yet available!\n");
pthread_mutex_unlock(&priv->skew_mutex);
continue;
}
pthread_mutex_unlock(&priv->skew_mutex);
gettimeofday(&tv, NULL);
priv->audio_recv_blocks_total++;
current_time = (long long)1e6*tv.tv_sec + tv.tv_usec - priv->audio_start_time;
if (priv->audio_recv_blocks_total < priv->aud_skew_cnt*2) {
start_time_avg += (long long)1e6*tv.tv_sec + tv.tv_usec - priv->audio_usecs_per_block*priv->audio_recv_blocks_total;
priv->audio_start_time = start_time_avg/(priv->audio_recv_blocks_total+1);
}
// fprintf(stderr, "spb = %f, bs = %d, skew = %f\n", priv->audio_secs_per_block, priv->audio_in.blocksize,
// (double)(current_time - 1e6*priv->audio_secs_per_block*priv->audio_recv_blocks_total)/1e6);
// put the current skew into the ring buffer
priv->audio_skew_total -= priv->audio_skew_buffer[audio_skew_ptr];
priv->audio_skew_buffer[audio_skew_ptr] = current_time
- priv->audio_usecs_per_block*priv->audio_recv_blocks_total;
priv->audio_skew_total += priv->audio_skew_buffer[audio_skew_ptr];
pthread_mutex_lock(&priv->skew_mutex);
// skew calculation
// compute the sliding average of the skews
if (priv->audio_recv_blocks_total > priv->aud_skew_cnt) {
priv->audio_skew = priv->audio_skew_total/priv->aud_skew_cnt;
} else {
priv->audio_skew = priv->audio_skew_total/priv->audio_recv_blocks_total;
}
// put the current skew change (skew-prev_skew) into the ring buffer
priv->audio_skew_delta_total -= priv->audio_skew_delta_buffer[audio_skew_ptr];
priv->audio_skew_delta_buffer[audio_skew_ptr] = priv->audio_skew - prev_skew_uncorr;
priv->audio_skew_delta_total += priv->audio_skew_delta_buffer[audio_skew_ptr];
prev_skew_uncorr = priv->audio_skew; // remember the _uncorrected_ average value
audio_skew_ptr = (audio_skew_ptr+1) % priv->aud_skew_cnt; // rotate the buffer pointer
// sliding average approximates the value in the middle of the interval
// so interpolate the skew value further to the current time
priv->audio_skew += priv->audio_skew_delta_total/2;
// now finally, priv->audio_skew contains fairly good approximation
// of the current value
// current skew factor (assuming linearity)
// used for further interpolation in video_grabber
// probably overkill but seems to be necessary for
// stress testing by dropping half of the audio frames ;)
// especially when using ALSA with large block sizes
// where audio_skew remains a long while behind
if ((priv->audio_skew_measure_time != 0) && (current_time - priv->audio_skew_measure_time != 0)) {
priv->audio_skew_factor = (double)(priv->audio_skew-prev_skew)/(current_time - priv->audio_skew_measure_time);
} else {
priv->audio_skew_factor = 0.0;
}
priv->audio_skew_measure_time = current_time;
prev_skew = priv->audio_skew;
priv->audio_skew += priv->audio_start_time - priv->first_frame;
pthread_mutex_unlock(&priv->skew_mutex);
// fprintf(stderr, "audio_skew = %f, delta = %f\n", (double)priv->audio_skew/1e6, (double)priv->audio_skew_delta_total/1e6);
pthread_mutex_lock(&priv->audio_mutex);
if ((priv->audio_tail+1) % priv->audio_buffer_size == priv->audio_head) {
mp_msg(MSGT_TV, MSGL_ERR, "\ntoo bad - dropping audio frame !\n");
priv->audio_drop++;
} else {
priv->audio_tail = (priv->audio_tail+1) % priv->audio_buffer_size;
priv->audio_cnt++;
}
pthread_mutex_unlock(&priv->audio_mutex);
}
return NULL;
}
static double grab_audio_frame(priv_t *priv, char *buffer, int len)
{
mp_dbg(MSGT_TV, MSGL_DBG2, "grab_audio_frame(priv=%p, buffer=%p, len=%d)\n",
priv, buffer, len);
// hack: if grab_audio_frame is called first, it means we are used by mplayer
// => switch to the mode which outputs audio immediately, even if
// it should be silence
if (priv->first) priv->audio_insert_null_samples = 1;
pthread_mutex_lock(&priv->audio_mutex);
while (priv->audio_insert_null_samples
&& priv->dropped_frames_timeshift - priv->dropped_frames_compensated >= priv->audio_usecs_per_block) {
// some frames were dropped - drop the corresponding number of audio blocks
if (priv->audio_drop) {
priv->audio_drop--;
} else {
if (priv->audio_head == priv->audio_tail) break;
priv->audio_head = (priv->audio_head+1) % priv->audio_buffer_size;
}
priv->dropped_frames_compensated += priv->audio_usecs_per_block;
}
// compensate for dropped audio frames
if (priv->audio_drop && (priv->audio_head == priv->audio_tail)) {
priv->audio_drop--;
memset(buffer, 0, len);
goto out;
}
if (priv->audio_insert_null_samples && (priv->audio_head == priv->audio_tail)) {
// return silence to avoid desync and stuttering
memset(buffer, 0, len);
priv->audio_null_blocks_inserted++;
goto out;
}
pthread_mutex_unlock(&priv->audio_mutex);
while (priv->audio_head == priv->audio_tail) {
// this is mencoder => just wait until some audio is available
usleep(10000);
}
pthread_mutex_lock(&priv->audio_mutex);
memcpy(buffer, priv->audio_ringbuffer+priv->audio_head*priv->audio_in.blocksize, len);
priv->audio_head = (priv->audio_head+1) % priv->audio_buffer_size;
priv->audio_cnt--;
out:
pthread_mutex_unlock(&priv->audio_mutex);
priv->audio_sent_blocks_total++;
return (double)priv->audio_sent_blocks_total*priv->audio_secs_per_block;
}
static int get_audio_framesize(priv_t *priv)
{
return priv->audio_in.blocksize;
}
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