tvi_v4l.c

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/*
  Video 4 Linux input

  (C) Alex Beregszaszi

  Some ideas are based on xawtv/libng's grab-v4l.c written by
    Gerd Knorr <[e-mail]>

  Multithreading, a/v sync and native ALSA support by
    Jindrich Makovicka <[e-mail]>

  Mjpeg hardware encoding support by
    Ivan Szanto <[e-mail]>

  CODE IS UNDER DEVELOPMENT, NO FEATURE REQUESTS PLEASE!
*/

#include "config.h"

#include <mplaylib.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/time.h>

/* Necessary to prevent collisions between <linux/time.h> and <sys/time.h> when V4L2 is installed. */
#define _LINUX_TIME_H

#include <linux/videodev.h>
#include <mplaylib.h>
#include <sys/mman.h>
#include <mplaylib.h>
#include <mplaylib.h>
#include <pthread.h>
#ifdef HAVE_SYS_SYSINFO_H
#include <sys/sysinfo.h>
#endif

#include "mp_msg.h"
#include "libaf/af_format.h"
#include "libmpcodecs/img_format.h"
#include "libvo/fastmemcpy.h"
#include "libvo/videodev_mjpeg.h"

#include "tv.h"

#include "audio_in.h"

static tvi_handle_t *tvi_init_v4l(tv_param_t* tv_param);

tvi_info_t tvi_info_v4l = {
    tvi_init_v4l,
    "Video 4 Linux input",
    "v4l",
    "Alex Beregszaszi",
    "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    (30000.0/1001.0)

#define MAX_AUDIO_CHANNELS      10

#define VID_BUF_SIZE_IMMEDIATE   2
#define VIDEO_AVG_BUFFER_SIZE  600

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;
    float                       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;
    long long                   *audio_skew_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;

    int                         first;
    int                         video_buffer_size_max;
    volatile int                video_buffer_size_current;
    unsigned char               **video_ringbuffer;
    long long                   *video_timebuffer;
    long long                   *video_avg_buffer;
    int                         video_avg_ptr;
    int                         video_interval_sum;
    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;
    pthread_mutex_t             video_buffer_mutex;

    long long                   starttime;
    double                      audio_secs_per_block;
    long long                   audio_skew_total;
    long                        audio_recv_blocks_total;
    long                        audio_sent_blocks_total;
    long                        mjpeg_bufsize;
#ifdef HAVE_TV_TELETEXT
    char                        *vbi_dev;
    int                         vbi_fd;
    int                         vbi_bufsize;
    int                         vbi_shutdown;
    pthread_t                   vbi_grabber_thread;
    void                        *priv_vbi;
#endif

    tv_param_t                  *tv_param;
} 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);
    case IMGFMT_UYVY:
       return(VIDEO_PALETTE_UYVY);
    }
    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);
}

static tvi_handle_t *tvi_init_v4l(tv_param_t* tv_param)
{
    tvi_handle_t *h;
    priv_t *priv;

    h = new_handle();
    if (!h)
        return(NULL);

    priv = h->priv;

    /* set video device name */
    if (!tv_param->device)
        priv->video_device = strdup("/dev/video0");
    else
        priv->video_device = strdup(tv_param->device);

    /* set video device name */
    if (!tv_param->adevice)
        priv->audio_device = NULL;
    else {
        priv->audio_device = strdup(tv_param->adevice);
    }

    /* allocation failed */
    if (!priv->video_device) {
        free_handle(h);
        return(NULL);
    }

    priv->tv_param=tv_param;
    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].flags |= VIDEO_AUDIO_MUTE;
        reqmode = -1;
        if (priv->tv_param->amode >= 0) {
            switch (priv->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;