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mpv/libmpdemux/tvi_v4l.c

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/*
Video 4 Linux input
(C) Alex Beregszaszi <alex@naxine.org>
Some ideas are based on xawtv/libng's grab-v4l.c written by
Gerd Knorr <kraxel@bytesex.org>
Multithreading, a/v sync and native ALSA support by
Jindrich Makovicka <makovick@kmlinux.fjfi.cvut.cz>
CODE IS UNDER DEVELOPMENT, NO FEATURE REQUESTS PLEASE!
*/
#include "config.h"
#if defined(USE_TV) && defined(HAVE_TV_V4L)
#include <stdio.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/time.h>
#include <linux/videodev.h>
#include <unistd.h>
#include <sys/mman.h>
#include <stdlib.h>
#include <string.h>
#include <pthread.h>
#ifdef HAVE_SYS_SYSINFO_H
#include <sys/sysinfo.h>
#endif
#include "mp_msg.h"
#include "../libao2/afmt.h"
#include "../libvo/img_format.h"
#include "../libvo/fastmemcpy.h"
#include "tv.h"
#include "audio_in.h"
static tvi_info_t info = {
"Video 4 Linux input",
"v4l",
"Alex Beregszaszi <alex@naxine.org>",
"under development"
};
#define PAL_WIDTH 768
#define PAL_HEIGHT 576
#define PAL_FPS 25
#define NTSC_WIDTH 640
#define NTSC_HEIGHT 480
#define NTSC_FPS 30
#define MAX_AUDIO_CHANNELS 10
#define VID_BUF_SIZE_IMMEDIATE 2
typedef struct {
/* general */
char *video_device;
int video_fd;
struct video_capability capability;
struct video_channel *channels;
int act_channel;
struct video_tuner tuner;
/* video */
struct video_picture picture;
int format; /* output format */
int width;
int height;
int bytesperline;
int fps;
struct video_mbuf mbuf;
unsigned char *mmap;
struct video_mmap *buf;
int nbuf;
/* audio */
char *audio_device;
audio_in_t audio_in;
int audio_id;
struct video_audio audio[MAX_AUDIO_CHANNELS];
int audio_channels[MAX_AUDIO_CHANNELS];
/* buffering stuff */
int immediate_mode;
int audio_buffer_size;
int aud_skew_cnt;
unsigned char *audio_ringbuffer;
double *audio_skew_buffer;
volatile int audio_head;
volatile int audio_tail;
volatile int audio_cnt;
volatile double audio_skew;
volatile double audio_skew_factor;
volatile double audio_skew_measure_time;
volatile int audio_drop;
int first;
int video_buffer_size;
unsigned char *video_ringbuffer;
double *video_timebuffer;
volatile int video_head;
volatile int video_tail;
volatile int video_cnt;
volatile int shutdown;
pthread_t audio_grabber_thread;
pthread_t video_grabber_thread;
pthread_mutex_t audio_starter;
pthread_mutex_t skew_mutex;
double starttime;
double audio_secs_per_block;
double audio_skew_total;
long audio_recv_blocks_total;
long audio_sent_blocks_total;
} priv_t;
#include "tvi_def.h"
static const char *device_cap2name[] = {
"capture", "tuner", "teletext", "overlay", "chromakey", "clipping",
"frameram", "scales", "monochrome", "subcapture", "mpeg-decoder",
"mpeg-encoder", "mjpeg-decoder", "mjpeg-encoder", NULL
};
static const char *device_palette2name[] = {
"-", "grey", "hi240", "rgb16", "rgb24", "rgb32", "rgb15", "yuv422",
"yuyv", "uyvy", "yuv420", "yuv411", "raw", "yuv422p", "yuv411p",
"yuv420p", "yuv410p"
};
#define PALETTE(x) ((x < sizeof(device_palette2name)/sizeof(char*)) ? device_palette2name[x] : "UNKNOWN")
static const char *norm2name(int mode)
{
switch (mode) {
case VIDEO_MODE_PAL:
return "pal";
case VIDEO_MODE_SECAM:
return "secam";
case VIDEO_MODE_NTSC:
return "ntsc";
case VIDEO_MODE_AUTO:
return "auto";
default:
return "unknown";
}
};
static const char *audio_mode2name(int mode)
{
switch (mode) {
case VIDEO_SOUND_MONO:
return "mono";
case VIDEO_SOUND_STEREO:
return "stereo";
case VIDEO_SOUND_LANG1:
return "language1";
case VIDEO_SOUND_LANG2:
return "language2";
default:
return "unknown";
}
};
static void *audio_grabber(void *data);
static void *video_grabber(void *data);
static int palette2depth(int palette)
{
switch(palette)
{
/* component */
case VIDEO_PALETTE_RGB555:
return(15);
case VIDEO_PALETTE_RGB565:
return(16);
case VIDEO_PALETTE_RGB24:
return(24);
case VIDEO_PALETTE_RGB32:
return(32);
/* planar */
case VIDEO_PALETTE_YUV411P:
case VIDEO_PALETTE_YUV420P:
case VIDEO_PALETTE_YUV410P:
return(12);
/* packed */
case VIDEO_PALETTE_YUV422P:
case VIDEO_PALETTE_YUV422:
case VIDEO_PALETTE_YUYV:
case VIDEO_PALETTE_UYVY:
case VIDEO_PALETTE_YUV420:
case VIDEO_PALETTE_YUV411:
return(16);
}
return(-1);
}
static int format2palette(int format)
{
switch(format)
{
case IMGFMT_BGR15:
return(VIDEO_PALETTE_RGB555);
case IMGFMT_BGR16:
return(VIDEO_PALETTE_RGB565);
case IMGFMT_BGR24:
return(VIDEO_PALETTE_RGB24);
case IMGFMT_BGR32:
return(VIDEO_PALETTE_RGB32);
case IMGFMT_YV12:
case IMGFMT_I420:
return(VIDEO_PALETTE_YUV420P);
case IMGFMT_YUY2:
return(VIDEO_PALETTE_YUV422);
}
return(-1);
}
// 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;
// make the audio buffer at least 5 seconds long
priv->audio_buffer_size = 1 + 5*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);
}
tvi_handle_t *tvi_init_v4l(char *device, char *adevice)
{
tvi_handle_t *h;
priv_t *priv;
h = new_handle();
if (!h)
return(NULL);
priv = h->priv;
/* set video device name */
if (!device)
priv->video_device = strdup("/dev/video");
else
priv->video_device = strdup(device);
/* set video device name */
if (!adevice)
priv->audio_device = NULL;
else {
priv->audio_device = strdup(adevice);
}
/* allocation failed */
if (!priv->video_device) {
free_handle(h);
return(NULL);
}
return(h);
}
/* retrieves info about audio channels from the BTTV */
static void init_v4l_audio(priv_t *priv)
{
int i;
int reqmode;
if (!priv->capability.audios) return;
/* audio chanlist */
mp_msg(MSGT_TV, MSGL_V, " Audio devices: %d\n", priv->capability.audios);
mp_msg(MSGT_TV, MSGL_V, "Video capture card reports the audio setup as follows:\n");
for (i = 0; i < priv->capability.audios; i++)
{
if (i >= MAX_AUDIO_CHANNELS)
{
mp_msg(MSGT_TV, MSGL_ERR, "no space for more audio channels (increase in source!) (%d > %d)\n",
i, MAX_AUDIO_CHANNELS);
i = priv->capability.audios;
break;
}
priv->audio[i].audio = i;
if (ioctl(priv->video_fd, VIDIOCGAUDIO, &priv->audio[i]) == -1)
{
mp_msg(MSGT_TV, MSGL_ERR, "ioctl get audio failed: %s\n", strerror(errno));
break;
}
/* mute all channels */
priv->audio[i].volume = 0;
priv->audio[i].flags |= VIDEO_AUDIO_MUTE;
reqmode = -1;
if (tv_param_amode >= 0) {
switch (tv_param_amode) {
case 0:
reqmode = VIDEO_SOUND_MONO;
break;
case 1:
reqmode = VIDEO_SOUND_STEREO;
break;
case 2:
reqmode = VIDEO_SOUND_LANG1;
break;
case 3:
reqmode = VIDEO_SOUND_LANG2;
break;
default:
mp_msg(MSGT_TV, MSGL_ERR, "Unknown audio mode requested.\n");
break;
}
if (reqmode >= 0) priv->audio[i].mode = reqmode;
}
ioctl(priv->video_fd, VIDIOCSAUDIO, &priv->audio[i]);
// get the parameters back
if (ioctl(priv->video_fd, VIDIOCGAUDIO, &priv->audio[i]) == -1)
{
mp_msg(MSGT_TV, MSGL_ERR, "ioctl get audio failed: %s\n", strerror(errno));
break;
}
switch(priv->audio[i].mode)
{
case VIDEO_SOUND_MONO:
case VIDEO_SOUND_LANG1:
case VIDEO_SOUND_LANG2:
priv->audio_channels[i] = 1;
break;
case VIDEO_SOUND_STEREO:
priv->audio_channels[i] = 2;
break;
}
if (reqmode >= 0 && priv->audio[i].mode != reqmode) {
mp_msg(MSGT_TV, MSGL_ERR, "Audio mode setup warning!\n");
mp_msg(MSGT_TV, MSGL_ERR, "Requested mode was %s, but v4l still reports %s.\n",
audio_mode2name(reqmode), audio_mode2name(priv->audio[i].mode));
mp_msg(MSGT_TV, MSGL_ERR, "You may need \"forcechan\" option to force stereo/mono audio recording.\n");
}
/* display stuff */
mp_msg(MSGT_TV, MSGL_V, " %d: %s: ", priv->audio[i].audio,
priv->audio[i].name);
if (priv->audio[i].flags & VIDEO_AUDIO_MUTABLE) {
mp_msg(MSGT_TV, MSGL_V, "muted=%s ",
(priv->audio[i].flags & VIDEO_AUDIO_MUTE) ? "yes" : "no");
}
mp_msg(MSGT_TV, MSGL_V, "vol=%d bass=%d treble=%d balance=%d mode=%s",
priv->audio[i].volume, priv->audio[i].bass, priv->audio[i].treble,
priv->audio[i].balance, audio_mode2name(priv->audio[i].mode));
mp_msg(MSGT_TV, MSGL_V, " chan=%d\n", priv->audio_channels[i]);
if (tv_param_forcechan >= 0)
priv->audio_channels[i] = tv_param_forcechan;
// we'll call VIDIOCSAUDIO again when starting capture
// let's set audio mode to requested mode again for the case
// when VIDIOCGAUDIO just cannot report the mode correctly
if (reqmode >= 0) priv->audio[i].mode = reqmode;
}
}
static int init(priv_t *priv)
{
int i;
if (tv_param_immediate == 1)
tv_param_noaudio = 1;
priv->video_ringbuffer = NULL;
priv->video_timebuffer = NULL;
priv->audio_ringbuffer = NULL;
priv->audio_skew_buffer = NULL;
priv->video_fd = open(priv->video_device, O_RDWR);
mp_msg(MSGT_TV, MSGL_DBG2, "Video fd: %d, %x\n", priv->video_fd,
priv->video_device);
if (priv->video_fd == -1)
{
mp_msg(MSGT_TV, MSGL_ERR, "unable to open '%s': %s\n",
priv->video_device, strerror(errno));
goto err;
}
/* get capabilities (priv->capability is needed!) */
if (ioctl(priv->video_fd, VIDIOCGCAP, &priv->capability) == -1)
{
mp_msg(MSGT_TV, MSGL_ERR, "ioctl get capabilites failed: %s\n", strerror(errno));
goto err;
}
fcntl(priv->video_fd, F_SETFD, FD_CLOEXEC);
mp_msg(MSGT_TV, MSGL_INFO, "Selected device: %s\n", priv->capability.name);
mp_msg(MSGT_TV, MSGL_INFO, " Capabilites: ");
for (i = 0; device_cap2name[i] != NULL; i++)
if (priv->capability.type & (1 << i))
mp_msg(MSGT_TV, MSGL_INFO, "%s ", device_cap2name[i]);
mp_msg(MSGT_TV, MSGL_INFO, "\n");
mp_msg(MSGT_TV, MSGL_INFO, " Device type: %d\n", priv->capability.type);
mp_msg(MSGT_TV, MSGL_INFO, " Supported sizes: %dx%d => %dx%d\n",
priv->capability.minwidth, priv->capability.minheight,
priv->capability.maxwidth, priv->capability.maxheight);
priv->width = priv->capability.minwidth;
priv->height = priv->capability.minheight;
mp_msg(MSGT_TV, MSGL_INFO, " Inputs: %d\n", priv->capability.channels);
priv->channels = (struct video_channel *)malloc(sizeof(struct video_channel)*priv->capability.channels);
if (!priv->channels)
goto malloc_failed;
memset(priv->channels, 0, sizeof(struct video_channel)*priv->capability.channels);
for (i = 0; i < priv->capability.channels; i++)
{
priv->channels[i].channel = i;
if (ioctl(priv->video_fd, VIDIOCGCHAN, &priv->channels[i]) == -1)
{
mp_msg(MSGT_TV, MSGL_ERR, "ioctl get channel failed: %s\n", strerror(errno));
break;
}
mp_msg(MSGT_TV, MSGL_INFO, " %d: %s: %s%s%s%s (tuner:%d, norm:%s)\n", i,
priv->channels[i].name,
(priv->channels[i].flags & VIDEO_VC_TUNER) ? "tuner " : "",
(priv->channels[i].flags & VIDEO_VC_AUDIO) ? "audio " : "",
(priv->channels[i].flags & VIDEO_TYPE_TV) ? "tv " : "",
(priv->channels[i].flags & VIDEO_TYPE_CAMERA) ? "camera " : "",
priv->channels[i].tuners,
norm2name(priv->channels[i].norm));
}
priv->act_channel = 0;
if (!(priv->capability.type & VID_TYPE_CAPTURE))
{
mp_msg(MSGT_TV, MSGL_ERR, "Only grabbing supported (for overlay use another program)\n");
goto err;
}
/* map grab buffer */
if (ioctl(priv->video_fd, VIDIOCGMBUF, &priv->mbuf) == -1)
{
mp_msg(MSGT_TV, MSGL_ERR, "ioctl get mbuf failed: %s\n", strerror(errno));
goto err;
}
mp_msg(MSGT_TV, MSGL_V, "mbuf: size=%d, frames=%d\n",
priv->mbuf.size, priv->mbuf.frames);
priv->mmap = mmap(0, priv->mbuf.size, PROT_READ|PROT_WRITE,
MAP_SHARED, priv->video_fd, 0);
if (priv->mmap == (unsigned char *)-1)
{
mp_msg(MSGT_TV, MSGL_ERR, "Unable to map memory for buffers: %s\n", strerror(errno));
goto err;
}
mp_msg(MSGT_TV, MSGL_DBG2, "our buffer: %p\n", priv->mmap);
/* num of buffers */
priv->nbuf = priv->mbuf.frames;
/* video buffers */
priv->buf = (struct video_mmap *)malloc(priv->nbuf * sizeof(struct video_mmap));
if (!priv->buf)
goto malloc_failed;
memset(priv->buf, 0, priv->nbuf * sizeof(struct video_mmap));
/* init v4l audio even when we don't capture */
init_v4l_audio(priv);
if (!priv->capability.audios && !tv_param_force_audio) tv_param_noaudio = 1;
/* audio init */
if (!tv_param_noaudio) {
#ifdef HAVE_ALSA9
if (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_device) {
audio_in_set_device(&priv->audio_in, priv->audio_device);
}
if (tv_param_audio_id < priv->capability.audios)
priv->audio_id = tv_param_audio_id;
else
priv->audio_id = 0;
audio_in_set_samplerate(&priv->audio_in, 44100);
if (priv->capability.audios) {
audio_in_set_channels(&priv->audio_in, priv->audio_channels[priv->audio_id]);
} else {
if (tv_param_forcechan >= 0) {
audio_in_set_channels(&priv->audio_in, tv_param_forcechan);
} else {
audio_in_set_channels(&priv->audio_in, 2);
}
}
if (audio_in_setup(&priv->audio_in) < 0) return 0;
setup_audio_buffer_sizes(priv);
}
return(1);
malloc_failed:
if (priv->channels)
free(priv->channels);
if (priv->buf)
free(priv->buf);
err:
if (priv->video_fd != -1)
close(priv->video_fd);
return(0);
}
static int uninit(priv_t *priv)
{
priv->shutdown = 1;
mp_msg(MSGT_TV, MSGL_V, "Waiting for threads to finish... ");
if (!tv_param_noaudio) {
pthread_join(priv->audio_grabber_thread, NULL);
pthread_mutex_destroy(&priv->audio_starter);
pthread_mutex_destroy(&priv->skew_mutex);
}
pthread_join(priv->video_grabber_thread, NULL);
mp_msg(MSGT_TV, MSGL_V, "done\n");
priv->audio[priv->audio_id].volume = 0;
priv->audio[priv->audio_id].flags |= VIDEO_AUDIO_MUTE;
ioctl(priv->video_fd, VIDIOCSAUDIO, &priv->audio[priv->audio_id]);
close(priv->video_fd);
audio_in_uninit(&priv->audio_in);
if (priv->video_ringbuffer)
free(priv->video_ringbuffer);
if (priv->video_timebuffer)
free(priv->video_timebuffer);
if (!tv_param_noaudio) {
if (priv->audio_ringbuffer)
free(priv->audio_ringbuffer);
if (priv->audio_skew_buffer)
free(priv->audio_skew_buffer);
}
return(1);
}
static int get_capture_buffer_size(priv_t *priv)
{
int bufsize, cnt;
if (tv_param_buffer_size) {
bufsize = tv_param_buffer_size*1024*1024;
} else {
#ifdef HAVE_SYS_SYSINFO_H
struct sysinfo si;
sysinfo(&si);
if (si.totalram<2*1024*1024) {
bufsize = 1024*1024;
} else {
bufsize = si.totalram/2;
}
#else
bufsize = 16*1024*1024;
#endif
}
cnt = bufsize/(priv->height*priv->bytesperline);
if (cnt < 2) cnt = 2;
return cnt;
}
static int start(priv_t *priv)
{
int i;
int bytes_per_sample;
if (ioctl(priv->video_fd, VIDIOCGPICT, &priv->picture) == -1)
{
mp_msg(MSGT_TV, MSGL_ERR, "ioctl get picture failed: %s\n", strerror(errno));
return(0);
}
priv->picture.palette = format2palette(priv->format);
priv->picture.depth = palette2depth(priv->picture.palette);
if (priv->format != IMGFMT_BGR15) {
priv->bytesperline = priv->width * priv->picture.depth / 8;
} else {
priv->bytesperline = priv->width * 2;
}
mp_msg(MSGT_TV, MSGL_V, "Picture values:\n");
mp_msg(MSGT_TV, MSGL_V, " Depth: %d, Palette: %s (Format: %s)\n", priv->picture.depth,
PALETTE(priv->picture.palette), vo_format_name(priv->format));
mp_msg(MSGT_TV, MSGL_V, " Brightness: %d, Hue: %d, Colour: %d, Contrast: %d\n",
priv->picture.brightness, priv->picture.hue,
priv->picture.colour, priv->picture.contrast);
if (ioctl(priv->video_fd, VIDIOCSPICT, &priv->picture) == -1)
{
mp_msg(MSGT_TV, MSGL_ERR, "ioctl set picture failed: %s\n", strerror(errno));
return(0);
}
priv->nbuf = priv->mbuf.frames;
for (i=0; i < priv->nbuf; i++)
{
priv->buf[i].format = priv->picture.palette;
priv->buf[i].frame = i;
priv->buf[i].width = priv->width;
priv->buf[i].height = priv->height;
mp_msg(MSGT_TV, MSGL_DBG2, "buffer: %d => %p\n", i, &priv->buf[i]);
}
#if 0
{
struct video_play_mode pmode;
pmode.mode = VID_PLAY_NORMAL;
pmode.p1 = 1;
pmode.p2 = 0;
if (ioctl(priv->video_fd, VIDIOCSPLAYMODE, &pmode) == -1)
{
mp_msg(MSGT_TV, MSGL_ERR, "ioctl set play mode failed: %s\n", strerror(errno));
// return(0);
}
}
#endif
#if 0
{
struct video_window win;
win.x = 0;
win.y = 0;
win.width = priv->width;
win.height = priv->height;
win.chromakey = -1;
win.flags = 0;
//win.clipcount = 0;
ioctl(priv->video_fd, VIDIOCSWIN, &win);
}
// initialize video capture
if (ioctl(priv->video_fd, VIDIOCCAPTURE, &one) == -1)
{
mp_msg(MSGT_TV, MSGL_ERR, "FATAL: ioctl ccapture failed: %s\n", strerror(errno));
return(0);
}
#endif
/* setup audio parameters */
if (!tv_param_noaudio) {
setup_audio_buffer_sizes(priv);
bytes_per_sample = priv->audio_in.bytes_per_sample;
priv->audio_skew_buffer = (double*)malloc(sizeof(double)*priv->aud_skew_cnt);
if (!priv->audio_skew_buffer) {
mp_msg(MSGT_TV, MSGL_ERR, "cannot allocate skew buffer: %s\n", strerror(errno));
return 0;
}
priv->audio_ringbuffer = (unsigned char*)malloc(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
*bytes_per_sample);
priv->audio_head = 0;
priv->audio_tail = 0;
priv->audio_cnt = 0;
priv->audio_drop = 0;
priv->audio_skew = 0.0;
priv->audio_skew_total = 0.0;
priv->audio_recv_blocks_total = 0;
priv->audio_sent_blocks_total = 0;
}
/* setup video parameters */
if (priv->immediate_mode) {
priv->video_buffer_size = VID_BUF_SIZE_IMMEDIATE;
} else {
priv->video_buffer_size = get_capture_buffer_size(priv);
}
if (!tv_param_noaudio) {
if (priv->video_buffer_size < 3.0*priv->fps*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");
}
}
mp_msg(MSGT_TV, MSGL_V, "Allocating a ring buffer for %d frames, %d MB total size.\n",
priv->video_buffer_size,
priv->video_buffer_size*priv->height*priv->bytesperline/(1024*1024));
priv->video_ringbuffer = (unsigned char*)malloc(priv->bytesperline * priv->height * priv->video_buffer_size);
if (!priv->video_ringbuffer) {
mp_msg(MSGT_TV, MSGL_ERR, "cannot allocate video buffer: %s\n", strerror(errno));
return 0;
}
priv->video_timebuffer = (double*)malloc(sizeof(double) * priv->video_buffer_size);
if (!priv->video_timebuffer) {
mp_msg(MSGT_TV, MSGL_ERR, "cannot allocate time buffer: %s\n", strerror(errno));
return 0;
}
priv->video_head = 0;
priv->video_tail = 0;
priv->video_cnt = 0;
priv->first = 1;
if (priv->capability.audios) {
/* enable audio */
if (tv_param_volume >= 0)
priv->audio[priv->audio_id].volume = tv_param_volume;
if (tv_param_bass >= 0)
priv->audio[priv->audio_id].bass = tv_param_bass;
if (tv_param_treble >= 0)
priv->audio[priv->audio_id].treble = tv_param_treble;
if (tv_param_balance >= 0)
priv->audio[priv->audio_id].balance = tv_param_balance;
priv->audio[priv->audio_id].flags &= ~VIDEO_AUDIO_MUTE;
mp_msg(MSGT_TV, MSGL_V, "Enabling tv audio. Requested setup is:\n");
mp_msg(MSGT_TV, MSGL_V, "id=%d vol=%d bass=%d treble=%d balance=%d mode=%s",
priv->audio_id,
priv->audio[priv->audio_id].volume, priv->audio[priv->audio_id].bass, priv->audio[priv->audio_id].treble,
priv->audio[priv->audio_id].balance, audio_mode2name(priv->audio[priv->audio_id].mode));
mp_msg(MSGT_TV, MSGL_V, " chan=%d\n", priv->audio_channels[priv->audio_id]);
ioctl(priv->video_fd, VIDIOCSAUDIO, &priv->audio[priv->audio_id]);
}
/* launch capture threads */
priv->shutdown = 0;
if (!tv_param_noaudio) {
pthread_mutex_init(&priv->audio_starter, NULL);
pthread_mutex_init(&priv->skew_mutex, NULL);
pthread_mutex_lock(&priv->audio_starter);
pthread_create(&priv->audio_grabber_thread, NULL, audio_grabber, priv);
}
/* we'll launch the video capture later, when a first request for a frame arrives */
return(1);
}
static int control(priv_t *priv, int cmd, void *arg)
{
mp_msg(MSGT_TV, MSGL_DBG2, "\ndebug: control(priv=%p, cmd=%d, arg=%p)\n",
priv, cmd, arg);
switch(cmd)
{
/* ========== GENERIC controls =========== */
case TVI_CONTROL_IS_VIDEO:
{
if (priv->capability.type & VID_TYPE_CAPTURE)
return(TVI_CONTROL_TRUE);
return(TVI_CONTROL_FALSE);
}
case TVI_CONTROL_IS_AUDIO:
if (priv->channels[priv->act_channel].flags & VIDEO_VC_AUDIO)
{
return(TVI_CONTROL_TRUE);
}
return(TVI_CONTROL_TRUE);
case TVI_CONTROL_IS_TUNER:
{
// if (priv->capability.type & VID_TYPE_TUNER)
if (priv->channels[priv->act_channel].flags & VIDEO_VC_TUNER)
return(TVI_CONTROL_TRUE);
return(TVI_CONTROL_FALSE);
}
/* ========== VIDEO controls =========== */
case TVI_CONTROL_VID_GET_FORMAT:
{
int output_fmt = -1;
output_fmt = priv->format;
(int)*(void **)arg = output_fmt;
mp_msg(MSGT_TV, MSGL_V, "Output format: %s\n", vo_format_name(output_fmt));
return(TVI_CONTROL_TRUE);
}
case TVI_CONTROL_VID_SET_FORMAT:
priv->format = (int)*(void **)arg;
// !HACK! v4l uses BGR format instead of RGB
// and we have to correct this. Fortunately,
// tv.c reads later the format back so we
// can persuade it to use what we want.
if (IMGFMT_IS_RGB(priv->format)) {
priv->format &= ~IMGFMT_RGB_MASK;
priv->format |= IMGFMT_BGR;
}
return(TVI_CONTROL_TRUE);
case TVI_CONTROL_VID_GET_PLANES:
(int)*(void **)arg = 1; /* FIXME, also not needed at this time */
return(TVI_CONTROL_TRUE);
case TVI_CONTROL_VID_GET_BITS:
(int)*(void **)arg = palette2depth(format2palette(priv->format));
return(TVI_CONTROL_TRUE);
case TVI_CONTROL_VID_GET_WIDTH:
(int)*(void **)arg = priv->width;
return(TVI_CONTROL_TRUE);
case TVI_CONTROL_VID_CHK_WIDTH:
{
int req_width = (int)*(void **)arg;
mp_msg(MSGT_TV, MSGL_V, "Requested width: %d\n", req_width);
if ((req_width >= priv->capability.minwidth) &&
(req_width <= priv->capability.maxwidth))
return(TVI_CONTROL_TRUE);
return(TVI_CONTROL_FALSE);
}
case TVI_CONTROL_VID_SET_WIDTH:
priv->width = (int)*(void **)arg;
return(TVI_CONTROL_TRUE);
case TVI_CONTROL_VID_GET_HEIGHT:
(int)*(void **)arg = priv->height;
return(TVI_CONTROL_TRUE);
case TVI_CONTROL_VID_CHK_HEIGHT:
{
int req_height = (int)*(void **)arg;
mp_msg(MSGT_TV, MSGL_V, "Requested height: %d\n", req_height);
if ((req_height >= priv->capability.minheight) &&
(req_height <= priv->capability.maxheight))
return(TVI_CONTROL_TRUE);
return(TVI_CONTROL_FALSE);
}
case TVI_CONTROL_VID_SET_HEIGHT:
priv->height = (int)*(void **)arg;
return(TVI_CONTROL_TRUE);
case TVI_CONTROL_VID_GET_PICTURE:
if (ioctl(priv->video_fd, VIDIOCGPICT, &priv->picture) == -1)
{
mp_msg(MSGT_TV, MSGL_ERR, "ioctl get picture failed: %s\n", strerror(errno));
return(TVI_CONTROL_FALSE);
}
return(TVI_CONTROL_TRUE);
case TVI_CONTROL_VID_SET_PICTURE:
if (ioctl(priv->video_fd, VIDIOCSPICT, &priv->picture) == -1)
{
mp_msg(MSGT_TV, MSGL_ERR, "ioctl get picture failed: %s\n", strerror(errno));
return(TVI_CONTROL_FALSE);
}
return(TVI_CONTROL_TRUE);
case TVI_CONTROL_VID_SET_BRIGHTNESS:
priv->picture.brightness = (int)*(void **)arg;
control(priv, TVI_CONTROL_VID_SET_PICTURE, 0);
return(TVI_CONTROL_TRUE);
case TVI_CONTROL_VID_SET_HUE:
priv->picture.hue = (int)*(void **)arg;
control(priv, TVI_CONTROL_VID_SET_PICTURE, 0);
return(TVI_CONTROL_TRUE);
case TVI_CONTROL_VID_SET_SATURATION:
priv->picture.colour = (int)*(void **)arg;
control(priv, TVI_CONTROL_VID_SET_PICTURE, 0);
return(TVI_CONTROL_TRUE);
case TVI_CONTROL_VID_SET_CONTRAST:
priv->picture.contrast = (int)*(void **)arg;
control(priv, TVI_CONTROL_VID_SET_PICTURE, 0);
return(TVI_CONTROL_TRUE);
case TVI_CONTROL_VID_GET_FPS:
(int)*(void **)arg=priv->fps;
return(TVI_CONTROL_TRUE);
/* ========== TUNER controls =========== */
case TVI_CONTROL_TUN_GET_FREQ:
{
unsigned long freq;
if (ioctl(priv->video_fd, VIDIOCGFREQ, &freq) == -1)
{
mp_msg(MSGT_TV, MSGL_ERR, "ioctl get freq failed: %s\n", strerror(errno));
return(TVI_CONTROL_FALSE);
}
/* tuner uses khz not mhz ! */
// if (priv->tuner.flags & VIDEO_TUNER_LOW)
// freq /= 1000;
(unsigned long)*(void **)arg = freq;
return(TVI_CONTROL_TRUE);
}
case TVI_CONTROL_TUN_SET_FREQ:
{
/* argument is in MHz ! */
unsigned long freq = (unsigned long)*(void **)arg;
mp_msg(MSGT_TV, MSGL_V, "requested frequency: %.3f\n", (float)freq/16);
/* tuner uses khz not mhz ! */
// if (priv->tuner.flags & VIDEO_TUNER_LOW)
// freq *= 1000;
// mp_msg(MSGT_TV, MSGL_V, " requesting from driver: freq=%.3f\n", (float)freq/16);
if (ioctl(priv->video_fd, VIDIOCSFREQ, &freq) == -1)
{
mp_msg(MSGT_TV, MSGL_ERR, "ioctl set freq failed: %s\n", strerror(errno));
return(TVI_CONTROL_FALSE);
}
usleep(100000); // wait to supress noise during switching
return(TVI_CONTROL_TRUE);
}
case TVI_CONTROL_TUN_GET_TUNER:
{
if (ioctl(priv->video_fd, VIDIOCGTUNER, &priv->tuner) == -1)
{
mp_msg(MSGT_TV, MSGL_ERR, "ioctl get tuner failed: %s\n", strerror(errno));
return(TVI_CONTROL_FALSE);
}
mp_msg(MSGT_TV, MSGL_V, "Tuner (%s) range: %lu -> %lu\n", priv->tuner.name,
priv->tuner.rangelow, priv->tuner.rangehigh);
return(TVI_CONTROL_TRUE);
}
case TVI_CONTROL_TUN_SET_TUNER:
{
if (ioctl(priv->video_fd, VIDIOCSTUNER, &priv->tuner) == -1)
{
mp_msg(MSGT_TV, MSGL_ERR, "ioctl set tuner failed: %s\n", strerror(errno));
return(TVI_CONTROL_FALSE);
}
return(TVI_CONTROL_TRUE);
}
case TVI_CONTROL_TUN_SET_NORM:
{
int req_mode = (int)*(void **)arg;
if ((req_mode != TV_NORM_PAL) && (req_mode != TV_NORM_NTSC) && (req_mode != TV_NORM_SECAM)) {
mp_msg(MSGT_TV, MSGL_ERR, "Unknown norm!\n");
return(TVI_CONTROL_FALSE);
}
if (priv->channels[priv->act_channel].flags & VIDEO_VC_TUNER) {
control(priv, TVI_CONTROL_TUN_GET_TUNER, 0);
if (((req_mode == TV_NORM_PAL) && !(priv->tuner.flags & VIDEO_TUNER_PAL)) ||
((req_mode == TV_NORM_NTSC) && !(priv->tuner.flags & VIDEO_TUNER_NTSC)) ||
((req_mode == TV_NORM_SECAM) && !(priv->tuner.flags & VIDEO_TUNER_SECAM)))
{
mp_msg(MSGT_TV, MSGL_ERR, "Tuner isn't capable to set norm!\n");
return(TVI_CONTROL_FALSE);
}
switch(req_mode) {
case TV_NORM_PAL:
priv->tuner.mode = VIDEO_MODE_PAL;
break;
case TV_NORM_NTSC:
priv->tuner.mode = VIDEO_MODE_NTSC;
break;
case TV_NORM_SECAM:
priv->tuner.mode = VIDEO_MODE_SECAM;
break;
}
if (control(priv, TVI_CONTROL_TUN_SET_TUNER, &priv->tuner) != TVI_CONTROL_TRUE) {
return(TVI_CONTROL_FALSE);
}
}
switch(req_mode) {
case TV_NORM_PAL:
priv->channels[priv->act_channel].norm = VIDEO_MODE_PAL;
break;
case TV_NORM_NTSC:
priv->channels[priv->act_channel].norm = VIDEO_MODE_NTSC;
break;
case TV_NORM_SECAM:
priv->channels[priv->act_channel].norm = VIDEO_MODE_SECAM;
break;
}
if (ioctl(priv->video_fd, VIDIOCSCHAN, &priv->channels[priv->act_channel]) == -1)
{
mp_msg(MSGT_TV, MSGL_ERR, "ioctl set chan failed: %s\n", strerror(errno));
return(TVI_CONTROL_FALSE);
}
if (ioctl(priv->video_fd, VIDIOCGCAP, &priv->capability) == -1) {
mp_msg(MSGT_TV, MSGL_ERR, "ioctl get capabilites failed: %s\n", strerror(errno));
return(TVI_CONTROL_FALSE);
}
if(req_mode == TV_NORM_PAL || req_mode == TV_NORM_SECAM) {
priv->fps = PAL_FPS;
}
if(req_mode == TV_NORM_NTSC) {
priv->fps = NTSC_FPS;
}
if(priv->height > priv->capability.maxheight) {
priv->height = priv->capability.maxheight;
}
if(priv->width > priv->capability.maxwidth) {
priv->width = priv->capability.maxwidth;
}
return(TVI_CONTROL_TRUE);
}
case TVI_CONTROL_TUN_GET_NORM:
{
(int)*(void **)arg = priv->tuner.mode;
return(TVI_CONTROL_TRUE);
}
/* ========== AUDIO controls =========== */
case TVI_CONTROL_AUD_GET_FORMAT:
{
(int)*(void **)arg = AFMT_S16_LE;
return(TVI_CONTROL_TRUE);
}
case TVI_CONTROL_AUD_GET_CHANNELS:
{
(int)*(void **)arg = priv->audio_in.channels;
return(TVI_CONTROL_TRUE);
}
case TVI_CONTROL_AUD_GET_SAMPLERATE:
{
(int)*(void **)arg = priv->audio_in.samplerate;
return(TVI_CONTROL_TRUE);
}
case TVI_CONTROL_AUD_GET_SAMPLESIZE:
{
(int)*(void **)arg = priv->audio_in.bytes_per_sample;
return(TVI_CONTROL_TRUE);
}
case TVI_CONTROL_AUD_SET_SAMPLERATE:
{
if (audio_in_set_samplerate(&priv->audio_in, (int)*(void **)arg) < 0) return TVI_CONTROL_FALSE;
setup_audio_buffer_sizes(priv);
return(TVI_CONTROL_TRUE);
}
/* ========== SPECIFIC controls =========== */
case TVI_CONTROL_SPC_GET_INPUT:
{
int req_chan = (int)*(void **)arg;
int i;
for (i = 0; i < priv->capability.channels; i++)
{
if (priv->channels[i].channel == req_chan)
break;
}
priv->act_channel = i;
if (ioctl(priv->video_fd, VIDIOCGCHAN, &priv->channels[i]) == -1)
{
mp_msg(MSGT_TV, MSGL_ERR, "ioctl get channel failed: %s\n", strerror(errno));
return(TVI_CONTROL_FALSE);
}
return(TVI_CONTROL_TRUE);
}
case TVI_CONTROL_SPC_SET_INPUT:
{
struct video_channel chan;
int req_chan = (int)*(void **)arg;
int i;
if (req_chan >= priv->capability.channels)
{
mp_msg(MSGT_TV, MSGL_ERR, "Invalid input requested: %d, valid: 0-%d\n",
req_chan, priv->capability.channels);
return(TVI_CONTROL_FALSE);
}
for (i = 0; i < priv->capability.channels; i++)
{
if (priv->channels[i].channel == req_chan)
chan = priv->channels[i];
}
if (ioctl(priv->video_fd, VIDIOCSCHAN, &chan) == -1)
{
mp_msg(MSGT_TV, MSGL_ERR, "ioctl set chan failed: %s\n", strerror(errno));
return(TVI_CONTROL_FALSE);
}
mp_msg(MSGT_TV, MSGL_INFO, "Using input '%s'\n", chan.name);
priv->act_channel = i;
/* update tuner state */
// if (priv->capability.type & VID_TYPE_TUNER)
if (priv->channels[priv->act_channel].flags & VIDEO_VC_TUNER)
control(priv, TVI_CONTROL_TUN_GET_TUNER, 0);
/* update local channel list */
control(priv, TVI_CONTROL_SPC_GET_INPUT, &req_chan);
return(TVI_CONTROL_TRUE);
case TVI_CONTROL_IMMEDIATE:
priv->immediate_mode = 1;
return(TVI_CONTROL_TRUE);
}
}
return(TVI_CONTROL_UNKNOWN);
}
// copies a video frame
// for RGB (i.e. BGR in mplayer) flips the image upside down
// for YV12 swaps the 2nd and 3rd plane
static inline void copy_frame(priv_t *priv, unsigned char *dest, unsigned char *source)
{
int i;
unsigned char *sptr;
// YV12 uses VIDEO_PALETTE_YUV420P, but the planes are swapped
if (priv->format == IMGFMT_YV12) {
memcpy(dest, source, priv->width * priv->height);
memcpy(dest+priv->width * priv->height*5/4, source+priv->width * priv->height, priv->width * priv->height/4);
memcpy(dest+priv->width * priv->height, source+priv->width * priv->height*5/4, priv->width * priv->height/4);
return;
}
switch (priv->picture.palette) {
case VIDEO_PALETTE_RGB24:
case VIDEO_PALETTE_RGB32:
case VIDEO_PALETTE_RGB555:
case VIDEO_PALETTE_RGB565:
sptr = source + (priv->height-1)*priv->bytesperline;
for (i = 0; i < priv->height; i++) {
memcpy(dest, sptr, priv->bytesperline);
dest += priv->bytesperline;
sptr -= priv->bytesperline;
}
break;
case VIDEO_PALETTE_UYVY:
case VIDEO_PALETTE_YUV420P:
default:
memcpy(dest, source, priv->bytesperline * priv->height);
}
}
// maximum skew change, in frames
#define MAX_SKEW_DELTA 0.6
static void *video_grabber(void *data)
{
priv_t *priv = (priv_t*)data;
struct timeval curtime;
double skew, prev_skew, xskew, interval, prev_interval;
int frame, nextframe;
int fsize = priv->bytesperline * priv->height;
int i;
int first = 1;
int framecount;
/* start the capture process */
if (ioctl(priv->video_fd, VIDIOCMCAPTURE, &priv->buf[0]) == -1)
{
mp_msg(MSGT_TV, MSGL_ERR, "\nioctl mcapture failed: %s\n", strerror(errno));
}
while (ioctl(priv->video_fd, VIDIOCSYNC, &priv->buf[1].frame) < 0 &&
(errno == EAGAIN || errno == EINTR));
mp_dbg(MSGT_TV, MSGL_DBG3, "\npicture sync failed\n");
prev_interval = 0.0;
prev_skew = 0.0;
for (framecount = 0; !priv->shutdown;)
{
for (i = 0; i < priv->nbuf && !priv->shutdown; i++, framecount++) {
if (priv->immediate_mode) {
while ((priv->video_tail+1) % priv->video_buffer_size == priv->video_head) {
usleep(10000);
if (priv->shutdown) {
return NULL;
}
}
}
frame = i;
nextframe = (i+1)%priv->nbuf;
if (ioctl(priv->video_fd, VIDIOCMCAPTURE, &priv->buf[nextframe]) == -1)
{
mp_msg(MSGT_TV, MSGL_ERR, "\nioctl mcapture failed: %s\n", strerror(errno));
continue;
}
while (ioctl(priv->video_fd, VIDIOCSYNC, &priv->buf[frame].frame) < 0 &&
(errno == EAGAIN || errno == EINTR));
mp_dbg(MSGT_TV, MSGL_DBG3, "\npicture sync failed\n");
gettimeofday(&curtime, NULL);
if (first) {
// this was a first frame - let's launch the audio capture thread immediately
// before that, just initialize some variables
priv->starttime = curtime.tv_sec + curtime.tv_usec*.000001;
priv->audio_skew_measure_time = 0;
pthread_mutex_unlock(&priv->audio_starter);
// first frame must always have timestamp of zero
xskew = 0.0;
skew = 0.0;
interval = 0.0;
first = 0;
} else {
if (!priv->immediate_mode) {
interval = curtime.tv_sec + curtime.tv_usec*.000001 - priv->starttime;
} else {
interval = (double)framecount/priv->fps;
}
if (!priv->immediate_mode && (
(interval - prev_interval < 1.0/priv->fps*0.85)
|| (interval - prev_interval > 1.0/priv->fps*1.15) ) ) {
mp_msg(MSGT_TV, MSGL_V, "\nvideo capture thread: frame delta ~ %.1lf fps\n",
1.0/(interval - prev_interval));
}
// interpolate the skew in time
pthread_mutex_lock(&priv->skew_mutex);
xskew = priv->audio_skew + (interval - priv->audio_skew_measure_time)*priv->audio_skew_factor;
pthread_mutex_unlock(&priv->skew_mutex);
// correct extreme skew changes to avoid (especially) moving backwards in time
if (xskew - prev_skew > (interval - prev_interval)*MAX_SKEW_DELTA) {
skew = prev_skew + (interval - prev_interval)*MAX_SKEW_DELTA;
} else if (xskew - prev_skew < -(interval - prev_interval)*MAX_SKEW_DELTA) {
skew = prev_skew - (interval - prev_interval)*MAX_SKEW_DELTA;
} else {
skew = xskew;
}
}
mp_msg(MSGT_TV, MSGL_DBG3, "\nfps = %lf, v_interval = %lf, a_skew = %f, corr_skew = %f\n",
1.0/(interval - prev_interval), interval/2, xskew, skew);
mp_msg(MSGT_TV, MSGL_DBG3, "vcnt = %d, acnt = %d\n", priv->video_cnt, priv->audio_cnt);
prev_skew = skew;
prev_interval = interval;
if ((priv->video_tail+1) % priv->video_buffer_size == priv->video_head) {
if (!priv->immediate_mode) {
mp_msg(MSGT_TV, MSGL_ERR, "\nvideo buffer full - dropping frame\n");
}
} else {
if (priv->immediate_mode) {
priv->video_timebuffer[priv->video_tail] = interval;
} else {
// compensate for audio skew
// negative skew => there are more audio samples, increase interval
// positive skew => less samples, shorten the interval
priv->video_timebuffer[priv->video_tail] = interval - skew;
}
copy_frame(priv, priv->video_ringbuffer+(priv->video_tail)*fsize, priv->mmap+priv->mbuf.offsets[frame]);
priv->video_tail = (priv->video_tail+1)%priv->video_buffer_size;
priv->video_cnt++;
}
}
}
return NULL;
}
static double grab_video_frame(priv_t *priv, char *buffer, int len)
{
double interval;
if (priv->first) {
pthread_create(&priv->video_grabber_thread, NULL, video_grabber, priv);
priv->first = 0;
}
while (priv->video_head == priv->video_tail) {
usleep(10000);
}
interval = priv->video_timebuffer[priv->video_head];
memcpy(buffer, priv->video_ringbuffer+priv->video_head*priv->bytesperline * priv->height, len);
priv->video_cnt--;
priv->video_head = (++priv->video_head)%priv->video_buffer_size;
return interval;
}
static int get_video_framesize(priv_t *priv)
{
return(priv->bytesperline * priv->height);
}
static void *audio_grabber(void *data)
{
priv_t *priv = (priv_t*)data;
struct timeval tv;
int i, audio_skew_ptr = 0;
double tmp, current_time, prev_skew = 0.0;
pthread_mutex_lock(&priv->audio_starter);
audio_in_start_capture(&priv->audio_in);
for (i = 0; i < priv->aud_skew_cnt; i++)
priv->audio_skew_buffer[i] = 0.0;
for (; !priv->shutdown;)
{
if (audio_in_read_chunk(&priv->audio_in, priv->audio_ringbuffer+priv->audio_tail*priv->audio_in.blocksize) < 0)
continue;
gettimeofday(&tv, NULL);
priv->audio_recv_blocks_total++;
current_time = tv.tv_sec + tv.tv_usec*.000001 - priv->starttime;
// compute the moving sum of the skews
if (priv->audio_recv_blocks_total % 1024 == 0) {
// recompute the moving sum to avoid truncation errors
priv->audio_skew_buffer[audio_skew_ptr] = current_time
- priv->audio_secs_per_block*priv->audio_recv_blocks_total;
audio_skew_ptr = (audio_skew_ptr+1) % priv->aud_skew_cnt;
for (i = 0, tmp = 0.0; i < priv->aud_skew_cnt; i++)
tmp += priv->audio_skew_buffer[i];
priv->audio_skew_total = tmp;
} else {
priv->audio_skew_total -= priv->audio_skew_buffer[audio_skew_ptr];
priv->audio_skew_buffer[audio_skew_ptr] = current_time
- priv->audio_secs_per_block*priv->audio_recv_blocks_total;
priv->audio_skew_total += priv->audio_skew_buffer[audio_skew_ptr];
audio_skew_ptr = (audio_skew_ptr+1) % priv->aud_skew_cnt;
}
pthread_mutex_lock(&priv->skew_mutex);
// linear interpolation - here we interpolate current skew value
// from the moving average, which we expect to be in the middle
// of the interval
if (priv->audio_recv_blocks_total > priv->aud_skew_cnt) {
priv->audio_skew = priv->audio_skew_total/priv->aud_skew_cnt;
priv->audio_skew += (priv->audio_skew*priv->aud_skew_cnt)/(2*priv->audio_recv_blocks_total-priv->aud_skew_cnt);
} else {
// priv->audio_skew = 2*priv->audio_skew_total/priv->aud_skew_cnt;
priv->audio_skew = (priv->aud_skew_cnt+priv->audio_recv_blocks_total)/priv->aud_skew_cnt*priv->audio_skew_total/priv->audio_recv_blocks_total;
// priv->audio_skew = current_time - priv->audio_secs_per_block*priv->audio_recv_blocks_total;
}
// 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
priv->audio_skew_factor = (priv->audio_skew-prev_skew)/(current_time - priv->audio_skew_measure_time);
priv->audio_skew_measure_time = current_time;
prev_skew = priv->audio_skew;
pthread_mutex_unlock(&priv->skew_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) % priv->audio_buffer_size;
priv->audio_cnt++;
}
}
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);
// compensate for dropped audio frames
if (priv->audio_drop && (priv->audio_head == priv->audio_tail)) {
priv->audio_drop--;
priv->audio_sent_blocks_total++;
memset(buffer, 0, len);
return (double)priv->audio_sent_blocks_total*priv->audio_secs_per_block;
}
while (priv->audio_head == priv->audio_tail) {
usleep(10000);
}
memcpy(buffer, priv->audio_ringbuffer+priv->audio_head*priv->audio_in.blocksize, len);
priv->audio_head = (++priv->audio_head) % priv->audio_buffer_size;
priv->audio_cnt--;
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);
}
#endif /* USE_TV */
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