ffplay.c 55.5 KB
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/*
 * FFplay : Simple Media Player based on the ffmpeg libraries
 * Copyright (c) 2003 Fabrice Bellard
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
#define HAVE_AV_CONFIG_H
#include "avformat.h"

#include "cmdutils.h"

#include <SDL.h>
#include <SDL_thread.h>

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#ifdef CONFIG_WIN32
#undef main /* We don't want SDL to override our main() */
#endif

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#if defined(__linux__)
#define HAVE_X11
#endif

#ifdef HAVE_X11
#include <X11/Xlib.h>
#endif

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//#define DEBUG_SYNC

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#define MAX_VIDEOQ_SIZE (5 * 256 * 1024)
#define MAX_AUDIOQ_SIZE (5 * 16 * 1024)

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/* SDL audio buffer size, in samples. Should be small to have precise
   A/V sync as SDL does not have hardware buffer fullness info. */
#define SDL_AUDIO_BUFFER_SIZE 1024

/* no AV sync correction is done if below the AV sync threshold */
#define AV_SYNC_THRESHOLD 0.08
/* no AV correction is done if too big error */
#define AV_NOSYNC_THRESHOLD 10.0

/* maximum audio speed change to get correct sync */
#define SAMPLE_CORRECTION_PERCENT_MAX 10

/* we use about AUDIO_DIFF_AVG_NB A-V differences to make the average */
#define AUDIO_DIFF_AVG_NB   20

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/* NOTE: the size must be big enough to compensate the hardware audio buffersize size */
#define SAMPLE_ARRAY_SIZE (2*65536)

typedef struct PacketQueue {
    AVPacketList *first_pkt, *last_pkt;
    int nb_packets;
    int size;
    int abort_request;
    SDL_mutex *mutex;
    SDL_cond *cond;
} PacketQueue;

#define VIDEO_PICTURE_QUEUE_SIZE 1

typedef struct VideoPicture {
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    double pts; /* presentation time stamp for this picture */
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    SDL_Overlay *bmp;
    int width, height; /* source height & width */
    int allocated;
} VideoPicture;

enum {
    AV_SYNC_AUDIO_MASTER, /* default choice */
    AV_SYNC_VIDEO_MASTER,
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    AV_SYNC_EXTERNAL_CLOCK, /* synchronize to an external clock */
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};

typedef struct VideoState {
    SDL_Thread *parse_tid;
    SDL_Thread *video_tid;
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    AVInputFormat *iformat;
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    int no_background;
    int abort_request;
    int paused;
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    int last_paused;
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    int seek_req;
    int64_t seek_pos;
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    AVFormatContext *ic;
    int dtg_active_format;

    int audio_stream;
    
    int av_sync_type;
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    double external_clock; /* external clock base */
    int64_t external_clock_time;
    
    double audio_clock;
    double audio_diff_cum; /* used for AV difference average computation */
    double audio_diff_avg_coef;
    double audio_diff_threshold;
    int audio_diff_avg_count;
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    AVStream *audio_st;
    PacketQueue audioq;
    int audio_hw_buf_size;
    /* samples output by the codec. we reserve more space for avsync
       compensation */
    uint8_t audio_buf[(AVCODEC_MAX_AUDIO_FRAME_SIZE * 3) / 2]; 
    int audio_buf_size; /* in bytes */
    int audio_buf_index; /* in bytes */
    AVPacket audio_pkt;
    uint8_t *audio_pkt_data;
    int audio_pkt_size;
    
    int show_audio; /* if true, display audio samples */
    int16_t sample_array[SAMPLE_ARRAY_SIZE];
    int sample_array_index;
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    int last_i_start;
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    double frame_timer;
    double frame_last_pts;
    double frame_last_delay;
    double video_clock;
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    int video_stream;
    AVStream *video_st;
    PacketQueue videoq;
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    double video_last_P_pts; /* pts of the last P picture (needed if B
                                frames are present) */
    double video_current_pts; /* current displayed pts (different from
                                 video_clock if frame fifos are used) */
    int64_t video_current_pts_time; /* time at which we updated
                                       video_current_pts - used to
                                       have running video pts */
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    VideoPicture pictq[VIDEO_PICTURE_QUEUE_SIZE];
    int pictq_size, pictq_rindex, pictq_windex;
    SDL_mutex *pictq_mutex;
    SDL_cond *pictq_cond;
    
    //    QETimer *video_timer;
    char filename[1024];
    int width, height, xleft, ytop;
} VideoState;

void show_help(void);
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static int audio_write_get_buf_size(VideoState *is);
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/* options specified by the user */
static AVInputFormat *file_iformat;
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static AVImageFormat *image_format;
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static const char *input_filename;
static int fs_screen_width;
static int fs_screen_height;
static int screen_width = 640;
static int screen_height = 480;
static int audio_disable;
static int video_disable;
static int display_disable;
static int show_status;
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static int av_sync_type = AV_SYNC_AUDIO_MASTER;
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static int64_t start_time = AV_NOPTS_VALUE;
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static int debug = 0;
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static int debug_mv = 0;
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static int step = 0;
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/* current context */
static int is_full_screen;
static VideoState *cur_stream;
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static int64_t audio_callback_time;
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#define FF_ALLOC_EVENT   (SDL_USEREVENT)
#define FF_REFRESH_EVENT (SDL_USEREVENT + 1)
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#define FF_QUIT_EVENT    (SDL_USEREVENT + 2)
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SDL_Surface *screen;

/* packet queue handling */
static void packet_queue_init(PacketQueue *q)
{
    memset(q, 0, sizeof(PacketQueue));
    q->mutex = SDL_CreateMutex();
    q->cond = SDL_CreateCond();
}

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static void packet_queue_flush(PacketQueue *q)
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{
    AVPacketList *pkt, *pkt1;

    for(pkt = q->first_pkt; pkt != NULL; pkt = pkt1) {
        pkt1 = pkt->next;
        av_free_packet(&pkt->pkt);
    }
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    q->last_pkt = NULL;
    q->first_pkt = NULL;
    q->nb_packets = 0;
    q->size = 0;
}

static void packet_queue_end(PacketQueue *q)
{
    packet_queue_flush(q);
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    SDL_DestroyMutex(q->mutex);
    SDL_DestroyCond(q->cond);
}

static int packet_queue_put(PacketQueue *q, AVPacket *pkt)
{
    AVPacketList *pkt1;

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    /* duplicate the packet */
    if (av_dup_packet(pkt) < 0)
        return -1;
    
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    pkt1 = av_malloc(sizeof(AVPacketList));
    if (!pkt1)
        return -1;
    pkt1->pkt = *pkt;
    pkt1->next = NULL;

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    SDL_LockMutex(q->mutex);

    if (!q->last_pkt)

        q->first_pkt = pkt1;
    else
        q->last_pkt->next = pkt1;
    q->last_pkt = pkt1;
    q->nb_packets++;
    q->size += pkt1->pkt.size;
    /* XXX: should duplicate packet data in DV case */
    SDL_CondSignal(q->cond);

    SDL_UnlockMutex(q->mutex);
    return 0;
}

static void packet_queue_abort(PacketQueue *q)
{
    SDL_LockMutex(q->mutex);

    q->abort_request = 1;
    
    SDL_CondSignal(q->cond);

    SDL_UnlockMutex(q->mutex);
}

/* return < 0 if aborted, 0 if no packet and > 0 if packet.  */
static int packet_queue_get(PacketQueue *q, AVPacket *pkt, int block)
{
    AVPacketList *pkt1;
    int ret;

    SDL_LockMutex(q->mutex);

    for(;;) {
        if (q->abort_request) {
            ret = -1;
            break;
        }
            
        pkt1 = q->first_pkt;
        if (pkt1) {
            q->first_pkt = pkt1->next;
            if (!q->first_pkt)
                q->last_pkt = NULL;
            q->nb_packets--;
            q->size -= pkt1->pkt.size;
            *pkt = pkt1->pkt;
            av_free(pkt1);
            ret = 1;
            break;
        } else if (!block) {
            ret = 0;
            break;
        } else {
            SDL_CondWait(q->cond, q->mutex);
        }
    }
    SDL_UnlockMutex(q->mutex);
    return ret;
}

static inline void fill_rectangle(SDL_Surface *screen, 
                                  int x, int y, int w, int h, int color)
{
    SDL_Rect rect;
    rect.x = x;
    rect.y = y;
    rect.w = w;
    rect.h = h;
    SDL_FillRect(screen, &rect, color);
}

#if 0
/* draw only the border of a rectangle */
void fill_border(VideoState *s, int x, int y, int w, int h, int color)
{
    int w1, w2, h1, h2;

    /* fill the background */
    w1 = x;
    if (w1 < 0)
        w1 = 0;
    w2 = s->width - (x + w);
    if (w2 < 0)
        w2 = 0;
    h1 = y;
    if (h1 < 0)
        h1 = 0;
    h2 = s->height - (y + h);
    if (h2 < 0)
        h2 = 0;
    fill_rectangle(screen, 
                   s->xleft, s->ytop, 
                   w1, s->height, 
                   color);
    fill_rectangle(screen, 
                   s->xleft + s->width - w2, s->ytop, 
                   w2, s->height, 
                   color);
    fill_rectangle(screen, 
                   s->xleft + w1, s->ytop, 
                   s->width - w1 - w2, h1, 
                   color);
    fill_rectangle(screen, 
                   s->xleft + w1, s->ytop + s->height - h2,
                   s->width - w1 - w2, h2,
                   color);
}
#endif

static void video_image_display(VideoState *is)
{
    VideoPicture *vp;
    float aspect_ratio;
    int width, height, x, y;
    SDL_Rect rect;

    vp = &is->pictq[is->pictq_rindex];
    if (vp->bmp) {
        /* XXX: use variable in the frame */
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        if (is->video_st->codec.sample_aspect_ratio.num == 0) 
            aspect_ratio = 0;
        else
            aspect_ratio = av_q2d(is->video_st->codec.sample_aspect_ratio) 
                * is->video_st->codec.width / is->video_st->codec.height;;
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        if (aspect_ratio <= 0.0)
            aspect_ratio = (float)is->video_st->codec.width / 
                (float)is->video_st->codec.height;
        /* if an active format is indicated, then it overrides the
           mpeg format */
#if 0
        if (is->video_st->codec.dtg_active_format != is->dtg_active_format) {
            is->dtg_active_format = is->video_st->codec.dtg_active_format;
            printf("dtg_active_format=%d\n", is->dtg_active_format);
        }
#endif
#if 0
        switch(is->video_st->codec.dtg_active_format) {
        case FF_DTG_AFD_SAME:
        default:
            /* nothing to do */
            break;
        case FF_DTG_AFD_4_3:
            aspect_ratio = 4.0 / 3.0;
            break;
        case FF_DTG_AFD_16_9:
            aspect_ratio = 16.0 / 9.0;
            break;
        case FF_DTG_AFD_14_9:
            aspect_ratio = 14.0 / 9.0;
            break;
        case FF_DTG_AFD_4_3_SP_14_9:
            aspect_ratio = 14.0 / 9.0;
            break;
        case FF_DTG_AFD_16_9_SP_14_9:
            aspect_ratio = 14.0 / 9.0;
            break;
        case FF_DTG_AFD_SP_4_3:
            aspect_ratio = 4.0 / 3.0;
            break;
        }
#endif

        /* XXX: we suppose the screen has a 1.0 pixel ratio */
        height = is->height;
        width = ((int)rint(height * aspect_ratio)) & -3;
        if (width > is->width) {
            width = is->width;
            height = ((int)rint(width / aspect_ratio)) & -3;
        }
        x = (is->width - width) / 2;
        y = (is->height - height) / 2;
        if (!is->no_background) {
            /* fill the background */
            //            fill_border(is, x, y, width, height, QERGB(0x00, 0x00, 0x00));
        } else {
            is->no_background = 0;
        }
        rect.x = is->xleft + x;
        rect.y = is->xleft + y;
        rect.w = width;
        rect.h = height;
        SDL_DisplayYUVOverlay(vp->bmp, &rect);
    } else {
#if 0
        fill_rectangle(screen, 
                       is->xleft, is->ytop, is->width, is->height, 
                       QERGB(0x00, 0x00, 0x00));
#endif
    }
}

static inline int compute_mod(int a, int b)
{
    a = a % b;
    if (a >= 0) 
        return a;
    else
        return a + b;
}

static void video_audio_display(VideoState *s)
{
    int i, i_start, x, y1, y, ys, delay, n, nb_display_channels;
    int ch, channels, h, h2, bgcolor, fgcolor;
    int16_t time_diff;
    
    /* compute display index : center on currently output samples */
    channels = s->audio_st->codec.channels;
    nb_display_channels = channels;
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    if (!s->paused) {
        n = 2 * channels;
        delay = audio_write_get_buf_size(s);
        delay /= n;
        
        /* to be more precise, we take into account the time spent since
           the last buffer computation */
        if (audio_callback_time) {
            time_diff = av_gettime() - audio_callback_time;
            delay += (time_diff * s->audio_st->codec.sample_rate) / 1000000;
        }
        
        delay -= s->width / 2;
        if (delay < s->width)
            delay = s->width;
        i_start = compute_mod(s->sample_array_index - delay * channels, SAMPLE_ARRAY_SIZE);
        s->last_i_start = i_start;
    } else {
        i_start = s->last_i_start;
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    }

    bgcolor = SDL_MapRGB(screen->format, 0x00, 0x00, 0x00);
    fill_rectangle(screen, 
                   s->xleft, s->ytop, s->width, s->height, 
                   bgcolor);

    fgcolor = SDL_MapRGB(screen->format, 0xff, 0xff, 0xff);

    /* total height for one channel */
    h = s->height / nb_display_channels;
    /* graph height / 2 */
    h2 = (h * 9) / 20;
    for(ch = 0;ch < nb_display_channels; ch++) {
        i = i_start + ch;
        y1 = s->ytop + ch * h + (h / 2); /* position of center line */
        for(x = 0; x < s->width; x++) {
            y = (s->sample_array[i] * h2) >> 15;
            if (y < 0) {
                y = -y;
                ys = y1 - y;
            } else {
                ys = y1;
            }
            fill_rectangle(screen, 
                           s->xleft + x, ys, 1, y, 
                           fgcolor);
            i += channels;
            if (i >= SAMPLE_ARRAY_SIZE)
                i -= SAMPLE_ARRAY_SIZE;
        }
    }

    fgcolor = SDL_MapRGB(screen->format, 0x00, 0x00, 0xff);

    for(ch = 1;ch < nb_display_channels; ch++) {
        y = s->ytop + ch * h;
        fill_rectangle(screen, 
                       s->xleft, y, s->width, 1, 
                       fgcolor);
    }
    SDL_UpdateRect(screen, s->xleft, s->ytop, s->width, s->height);
}

/* display the current picture, if any */
static void video_display(VideoState *is)
{
    if (is->audio_st && is->show_audio) 
        video_audio_display(is);
    else if (is->video_st)
        video_image_display(is);
}

static Uint32 sdl_refresh_timer_cb(Uint32 interval, void *opaque)
{
    SDL_Event event;
    event.type = FF_REFRESH_EVENT;
    event.user.data1 = opaque;
    SDL_PushEvent(&event);
    return 0; /* 0 means stop timer */
}

/* schedule a video refresh in 'delay' ms */
static void schedule_refresh(VideoState *is, int delay)
{
    SDL_AddTimer(delay, sdl_refresh_timer_cb, is);
}

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/* get the current audio clock value */
static double get_audio_clock(VideoState *is)
{
    double pts;
    int hw_buf_size, bytes_per_sec;
    pts = is->audio_clock;
    hw_buf_size = audio_write_get_buf_size(is);
    bytes_per_sec = 0;
    if (is->audio_st) {
        bytes_per_sec = is->audio_st->codec.sample_rate * 
            2 * is->audio_st->codec.channels;
    }
    if (bytes_per_sec)
        pts -= (double)hw_buf_size / bytes_per_sec;
    return pts;
}

/* get the current video clock value */
static double get_video_clock(VideoState *is)
{
    double delta;
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    if (is->paused) {
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        delta = 0;
    } else {
        delta = (av_gettime() - is->video_current_pts_time) / 1000000.0;
    }
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    return is->video_current_pts + delta;
}

/* get the current external clock value */
static double get_external_clock(VideoState *is)
{
    int64_t ti;
    ti = av_gettime();
    return is->external_clock + ((ti - is->external_clock_time) * 1e-6);
}

/* get the current master clock value */
static double get_master_clock(VideoState *is)
{
    double val;

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    if (is->av_sync_type == AV_SYNC_VIDEO_MASTER) {
        if (is->video_st)
            val = get_video_clock(is);
        else
            val = get_audio_clock(is);
    } else if (is->av_sync_type == AV_SYNC_AUDIO_MASTER) {
        if (is->audio_st)
            val = get_audio_clock(is);
        else
            val = get_video_clock(is);
    } else {
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        val = get_external_clock(is);
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    }
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    return val;
}

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/* seek in the stream */
static void stream_seek(VideoState *is, int64_t pos)
{
    is->seek_pos = pos;
    is->seek_req = 1;
}

/* pause or resume the video */
static void stream_pause(VideoState *is)
{
    is->paused = !is->paused;
    if (is->paused) {
        is->video_current_pts = get_video_clock(is);
    }
}

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/* called to display each frame */
static void video_refresh_timer(void *opaque)
{
    VideoState *is = opaque;
    VideoPicture *vp;
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    double actual_delay, delay, sync_threshold, ref_clock, diff;

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    if (is->video_st) {
        if (is->pictq_size == 0) {
            /* if no picture, need to wait */
            schedule_refresh(is, 40);
        } else {
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            /* dequeue the picture */
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            vp = &is->pictq[is->pictq_rindex];
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            /* update current video pts */
            is->video_current_pts = vp->pts;
            is->video_current_pts_time = av_gettime();

            /* compute nominal delay */
            delay = vp->pts - is->frame_last_pts;
            if (delay <= 0 || delay >= 1.0) {
                /* if incorrect delay, use previous one */
                delay = is->frame_last_delay;
            }
            is->frame_last_delay = delay;
            is->frame_last_pts = vp->pts;

            /* update delay to follow master synchronisation source */
            if (((is->av_sync_type == AV_SYNC_AUDIO_MASTER && is->audio_st) ||
                 is->av_sync_type == AV_SYNC_EXTERNAL_CLOCK)) {
                /* if video is slave, we try to correct big delays by
                   duplicating or deleting a frame */
                ref_clock = get_master_clock(is);
                diff = vp->pts - ref_clock;
                
                /* skip or repeat frame. We take into account the
                   delay to compute the threshold. I still don't know
                   if it is the best guess */
                sync_threshold = AV_SYNC_THRESHOLD;
                if (delay > sync_threshold)
                    sync_threshold = delay;
                if (fabs(diff) < AV_NOSYNC_THRESHOLD) {
                    if (diff <= -sync_threshold)
                        delay = 0;
                    else if (diff >= sync_threshold)
                        delay = 2 * delay;
                }
            }

            is->frame_timer += delay;
            /* compute the REAL delay (we need to do that to avoid
               long term errors */
            actual_delay = is->frame_timer - (av_gettime() / 1000000.0);
            if (actual_delay < 0.010) {
                /* XXX: should skip picture */
                actual_delay = 0.010;
            }
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            /* launch timer for next picture */
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            schedule_refresh(is, (int)(actual_delay * 1000 + 0.5));

#if defined(DEBUG_SYNC)
            printf("video: delay=%0.3f actual_delay=%0.3f pts=%0.3f A-V=%f\n", 
                   delay, actual_delay, vp->pts, -diff);
#endif
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            /* display picture */
            video_display(is);
            
            /* update queue size and signal for next picture */
            if (++is->pictq_rindex == VIDEO_PICTURE_QUEUE_SIZE)
                is->pictq_rindex = 0;
            
            SDL_LockMutex(is->pictq_mutex);
            is->pictq_size--;
            SDL_CondSignal(is->pictq_cond);
            SDL_UnlockMutex(is->pictq_mutex);
        }
    } else if (is->audio_st) {
        /* draw the next audio frame */

        schedule_refresh(is, 40);

        /* if only audio stream, then display the audio bars (better
           than nothing, just to test the implementation */
        
        /* display picture */
        video_display(is);
    } else {
        schedule_refresh(is, 100);
    }
    if (show_status) {
        static int64_t last_time;
        int64_t cur_time;
        int aqsize, vqsize;
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        double av_diff;
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        cur_time = av_gettime();
        if (!last_time || (cur_time - last_time) >= 500 * 1000) {
            aqsize = 0;
            vqsize = 0;
            if (is->audio_st)
                aqsize = is->audioq.size;
            if (is->video_st)
                vqsize = is->videoq.size;
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            av_diff = 0;
            if (is->audio_st && is->video_st)
                av_diff = get_audio_clock(is) - get_video_clock(is);
            printf("%7.2f A-V:%7.3f aq=%5dKB vq=%5dKB    \r", 
                   get_master_clock(is), av_diff, aqsize / 1024, vqsize / 1024);
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            fflush(stdout);
            last_time = cur_time;
        }
    }
}

/* allocate a picture (needs to do that in main thread to avoid
   potential locking problems */
static void alloc_picture(void *opaque)
{
    VideoState *is = opaque;
    VideoPicture *vp;

    vp = &is->pictq[is->pictq_windex];

    if (vp->bmp)
        SDL_FreeYUVOverlay(vp->bmp);

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#if 0
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    /* XXX: use generic function */
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    /* XXX: disable overlay if no hardware acceleration or if RGB format */
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    switch(is->video_st->codec.pix_fmt) {
    case PIX_FMT_YUV420P:
    case PIX_FMT_YUV422P:
    case PIX_FMT_YUV444P:
    case PIX_FMT_YUV422:
    case PIX_FMT_YUV410P:
    case PIX_FMT_YUV411P:
        is_yuv = 1;
        break;
    default:
        is_yuv = 0;
        break;
    }
#endif
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    vp->bmp = SDL_CreateYUVOverlay(is->video_st->codec.width,
                                   is->video_st->codec.height,
                                   SDL_YV12_OVERLAY, 
                                   screen);
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    vp->width = is->video_st->codec.width;
    vp->height = is->video_st->codec.height;

    SDL_LockMutex(is->pictq_mutex);
    vp->allocated = 1;
    SDL_CondSignal(is->pictq_cond);
    SDL_UnlockMutex(is->pictq_mutex);
}

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static int queue_picture(VideoState *is, AVFrame *src_frame, double pts)
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{
    VideoPicture *vp;
    int dst_pix_fmt;
    AVPicture pict;
    
    /* wait until we have space to put a new picture */
    SDL_LockMutex(is->pictq_mutex);
    while (is->pictq_size >= VIDEO_PICTURE_QUEUE_SIZE &&
           !is->videoq.abort_request) {
        SDL_CondWait(is->pictq_cond, is->pictq_mutex);
    }
    SDL_UnlockMutex(is->pictq_mutex);
    
    if (is->videoq.abort_request)
        return -1;

    vp = &is->pictq[is->pictq_windex];

    /* alloc or resize hardware picture buffer */
    if (!vp->bmp || 
        vp->width != is->video_st->codec.width ||
        vp->height != is->video_st->codec.height) {
        SDL_Event event;

        vp->allocated = 0;

        /* the allocation must be done in the main thread to avoid
           locking problems */
        event.type = FF_ALLOC_EVENT;
        event.user.data1 = is;
        SDL_PushEvent(&event);
        
        /* wait until the picture is allocated */
        SDL_LockMutex(is->pictq_mutex);
        while (!vp->allocated && !is->videoq.abort_request) {
            SDL_CondWait(is->pictq_cond, is->pictq_mutex);
        }
        SDL_UnlockMutex(is->pictq_mutex);

        if (is->videoq.abort_request)
            return -1;
    }

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    /* if the frame is not skipped, then display it */
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    if (vp->bmp) {
        /* get a pointer on the bitmap */
        SDL_LockYUVOverlay (vp->bmp);

        dst_pix_fmt = PIX_FMT_YUV420P;
        pict.data[0] = vp->bmp->pixels[0];
        pict.data[1] = vp->bmp->pixels[2];
        pict.data[2] = vp->bmp->pixels[1];

        pict.linesize[0] = vp->bmp->pitches[0];
        pict.linesize[1] = vp->bmp->pitches[2];
        pict.linesize[2] = vp->bmp->pitches[1];
        img_convert(&pict, dst_pix_fmt, 
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                    (AVPicture *)src_frame, is->video_st->codec.pix_fmt, 
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                    is->video_st->codec.width, is->video_st->codec.height);
        /* update the bitmap content */
        SDL_UnlockYUVOverlay(vp->bmp);

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        vp->pts = pts;
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        /* now we can update the picture count */
        if (++is->pictq_windex == VIDEO_PICTURE_QUEUE_SIZE)
            is->pictq_windex = 0;
        SDL_LockMutex(is->pictq_mutex);
        is->pictq_size++;
        SDL_UnlockMutex(is->pictq_mutex);
    }
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    return 0;
}

/* compute the exact PTS for the picture if it is omitted in the stream */
static int output_picture2(VideoState *is, AVFrame *src_frame, double pts1)
{
    double frame_delay, pts;
    
    pts = pts1;

    /* if B frames are present, and if the current picture is a I
       or P frame, we use the last pts */
    if (is->video_st->codec.has_b_frames && 
        src_frame->pict_type != FF_B_TYPE) {
        /* use last pts */
        pts = is->video_last_P_pts;
        /* get the pts for the next I or P frame if present */
        is->video_last_P_pts = pts1;
    }
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    if (pts != 0) {
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        /* update video clock with pts, if present */
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        is->video_clock = pts;
    } else {
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        pts = is->video_clock;
    }
    /* update video clock for next frame */
    frame_delay = (double)is->video_st->codec.frame_rate_base / 
        (double)is->video_st->codec.frame_rate;
    /* for MPEG2, the frame can be repeated, so we update the
       clock accordingly */
    if (src_frame->repeat_pict) {
        frame_delay += src_frame->repeat_pict * (frame_delay * 0.5);
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    }
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    is->video_clock += frame_delay;
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#if defined(DEBUG_SYNC) && 0
    {
        int ftype;
        if (src_frame->pict_type == FF_B_TYPE)
            ftype = 'B';
        else if (src_frame->pict_type == FF_I_TYPE)
            ftype = 'I';
        else
            ftype = 'P';
        printf("frame_type=%c clock=%0.3f pts=%0.3f\n", 
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               ftype, pts, pts1);
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    }
#endif
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    return queue_picture(is, src_frame, pts);
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}

static int video_thread(void *arg)
{
    VideoState *is = arg;
    AVPacket pkt1, *pkt = &pkt1;
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    int len1, got_picture;
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    AVFrame *frame= avcodec_alloc_frame();
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    double pts;

    for(;;) {
        while (is->paused && !is->videoq.abort_request) {
            SDL_Delay(10);
        }
        if (packet_queue_get(&is->videoq, pkt, 1) < 0)
            break;
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        /* NOTE: ipts is the PTS of the _first_ picture beginning in
           this packet, if any */
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        pts = 0;
        if (pkt->pts != AV_NOPTS_VALUE)
            pts = (double)pkt->pts / AV_TIME_BASE;

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        if (is->video_st->codec.codec_id == CODEC_ID_RAWVIDEO) {
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            avpicture_fill((AVPicture *)frame, pkt->data, 
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                           is->video_st->codec.pix_fmt,
                           is->video_st->codec.width,
                           is->video_st->codec.height);
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            frame->pict_type = FF_I_TYPE;
            if (output_picture2(is, frame, pts) < 0)
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                goto the_end;
        } else {
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            len1 = avcodec_decode_video(&is->video_st->codec, 
                                        frame, &got_picture, 
                                        pkt->data, pkt->size);
            if (len1 < 0)
                break;
            if (got_picture) {
                if (output_picture2(is, frame, pts) < 0)
                    goto the_end;
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            }
        }
        av_free_packet(pkt);
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        if (step) 
            if (cur_stream)
                stream_pause(cur_stream);
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    }
 the_end:
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    av_free(frame);
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    return 0;
}

/* copy samples for viewing in editor window */
static void update_sample_display(VideoState *is, short *samples, int samples_size)
{
    int size, len, channels;

    channels = is->audio_st->codec.channels;

    size = samples_size / sizeof(short);
    while (size > 0) {
        len = SAMPLE_ARRAY_SIZE - is->sample_array_index;
        if (len > size)
            len = size;
        memcpy(is->sample_array + is->sample_array_index, samples, len * sizeof(short));
        samples += len;
        is->sample_array_index += len;
        if (is->sample_array_index >= SAMPLE_ARRAY_SIZE)
            is->sample_array_index = 0;
        size -= len;
    }
}

/* return the new audio buffer size (samples can be added or deleted
   to get better sync if video or external master clock) */
static int synchronize_audio(VideoState *is, short *samples, 
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                             int samples_size1, double pts)
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{
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    int n, samples_size;
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    double ref_clock;
    
    n = 2 * is->audio_st->codec.channels;
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    samples_size = samples_size1;
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    /* if not master, then we try to remove or add samples to correct the clock */
    if (((is->av_sync_type == AV_SYNC_VIDEO_MASTER && is->video_st) ||
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         is->av_sync_type == AV_SYNC_EXTERNAL_CLOCK)) {
        double diff, avg_diff;
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        int wanted_size, min_size, max_size, nb_samples;
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        ref_clock = get_master_clock(is);
        diff = get_audio_clock(is) - ref_clock;
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        if (diff < AV_NOSYNC_THRESHOLD) {
            is->audio_diff_cum = diff + is->audio_diff_avg_coef * is->audio_diff_cum;
            if (is->audio_diff_avg_count < AUDIO_DIFF_AVG_NB) {
                /* not enough measures to have a correct estimate */
                is->audio_diff_avg_count++;
            } else {
                /* estimate the A-V difference */
                avg_diff = is->audio_diff_cum * (1.0 - is->audio_diff_avg_coef);

                if (fabs(avg_diff) >= is->audio_diff_threshold) {
                    wanted_size = samples_size + ((int)(diff * is->audio_st->codec.sample_rate) * n);
                    nb_samples = samples_size / n;
                
                    min_size = ((nb_samples * (100 - SAMPLE_CORRECTION_PERCENT_MAX)) / 100) * n;
                    max_size = ((nb_samples * (100 + SAMPLE_CORRECTION_PERCENT_MAX)) / 100) * n;
                    if (wanted_size < min_size)
                        wanted_size = min_size;
                    else if (wanted_size > max_size)
                        wanted_size = max_size;
                    
                    /* add or remove samples to correction the synchro */
                    if (wanted_size < samples_size) {
                        /* remove samples */
                        samples_size = wanted_size;
                    } else if (wanted_size > samples_size) {
                        uint8_t *samples_end, *q;
                        int nb;
                        
                        /* add samples */
                        nb = (samples_size - wanted_size);
                        samples_end = (uint8_t *)samples + samples_size - n;
                        q = samples_end + n;
                        while (nb > 0) {
                            memcpy(q, samples_end, n);
                            q += n;
                            nb -= n;
                        }
                        samples_size = wanted_size;
                    }
                }
#if 0
                printf("diff=%f adiff=%f sample_diff=%d apts=%0.3f vpts=%0.3f %f\n", 
                       diff, avg_diff, samples_size - samples_size1, 
                       is->audio_clock, is->video_clock, is->audio_diff_threshold);
#endif
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            }
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        } else {
            /* too big difference : may be initial PTS errors, so
               reset A-V filter */
            is->audio_diff_avg_count = 0;
            is->audio_diff_cum = 0;
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        }
    }

    return samples_size;
}

/* decode one audio frame and returns its uncompressed size */
static int audio_decode_frame(VideoState *is, uint8_t *audio_buf, double *pts_ptr)
{
    AVPacket *pkt = &is->audio_pkt;
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    int n, len1, data_size;
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    double pts;

    for(;;) {
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        /* NOTE: the audio packet can contain several frames */
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        while (is->audio_pkt_size > 0) {
            len1 = avcodec_decode_audio(&is->audio_st->codec, 
                                        (int16_t *)audio_buf, &data_size, 
                                        is->audio_pkt_data, is->audio_pkt_size);
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            if (len1 < 0) {
                /* if error, we skip the frame */
                is->audio_pkt_size = 0;
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                break;
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            }
            
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            is->audio_pkt_data += len1;
            is->audio_pkt_size -= len1;
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            if (data_size <= 0)
                continue;
            /* if no pts, then compute it */
            pts = is->audio_clock;
            *pts_ptr = pts;
            n = 2 * is->audio_st->codec.channels;
            is->audio_clock += (double)data_size / 
                (double)(n * is->audio_st->codec.sample_rate);
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#if defined(DEBUG_SYNC)
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            {
                static double last_clock;
                printf("audio: delay=%0.3f clock=%0.3f pts=%0.3f\n",
                       is->audio_clock - last_clock,
                       is->audio_clock, pts);
                last_clock = is->audio_clock;
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            }
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#endif
            return data_size;
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        }

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        /* free the current packet */
        if (pkt->data)
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            av_free_packet(pkt);
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        if (is->paused || is->audioq.abort_request) {
            return -1;
        }
        
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        /* read next packet */
        if (packet_queue_get(&is->audioq, pkt, 1) < 0)
            return -1;
        is->audio_pkt_data = pkt->data;
        is->audio_pkt_size = pkt->size;
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        /* if update the audio clock with the pts */
        if (pkt->pts != AV_NOPTS_VALUE) {
            is->audio_clock = (double)pkt->pts / AV_TIME_BASE;
        }
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    }
}

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/* get the current audio output buffer size, in samples. With SDL, we
   cannot have a precise information */
static int audio_write_get_buf_size(VideoState *is)
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{
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    return is->audio_hw_buf_size - is->audio_buf_index;
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}


/* prepare a new audio buffer */
void sdl_audio_callback(void *opaque, Uint8 *stream, int len)
{
    VideoState *is = opaque;
    int audio_size, len1;
    double pts;

    audio_callback_time = av_gettime();
    
    while (len > 0) {
        if (is->audio_buf_index >= is->audio_buf_size) {
           audio_size = audio_decode_frame(is, is->audio_buf, &pts);
           if (audio_size < 0) {
                /* if error, just output silence */
               is->audio_buf_size = 1024;
               memset(is->audio_buf, 0, is->audio_buf_size);
           } else {
               if (is->show_audio)
                   update_sample_display(is, (int16_t *)is->audio_buf, audio_size);
               audio_size = synchronize_audio(is, (int16_t *)is->audio_buf, audio_size, 
                                              pts);
               is->audio_buf_size = audio_size;
           }
           is->audio_buf_index = 0;
        }
        len1 = is->audio_buf_size - is->audio_buf_index;
        if (len1 > len)
            len1 = len;
        memcpy(stream, (uint8_t *)is->audio_buf + is->audio_buf_index, len1);
        len -= len1;
        stream += len1;
        is->audio_buf_index += len1;
    }
}


/* open a given stream. Return 0 if OK */
static int stream_component_open(VideoState *is, int stream_index)
{
    AVFormatContext *ic = is->ic;
    AVCodecContext *enc;
    AVCodec *codec;
    SDL_AudioSpec wanted_spec, spec;

    if (stream_index < 0 || stream_index >= ic->nb_streams)
        return -1;
    enc = &ic->streams[stream_index]->codec;
    
    /* prepare audio output */
    if (enc->codec_type == CODEC_TYPE_AUDIO) {
        wanted_spec.freq = enc->sample_rate;
        wanted_spec.format = AUDIO_S16SYS;
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        /* hack for AC3. XXX: suppress that */
        if (enc->channels > 2)
            enc->channels = 2;
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        wanted_spec.channels = enc->channels;
        wanted_spec.silence = 0;
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        wanted_spec.samples = SDL_AUDIO_BUFFER_SIZE;
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        wanted_spec.callback = sdl_audio_callback;
        wanted_spec.userdata = is;
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        if (SDL_OpenAudio(&wanted_spec, &spec) < 0) {
            fprintf(stderr, "SDL_OpenAudio: %s\n", SDL_GetError());
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            return -1;
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        }
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        is->audio_hw_buf_size = spec.size;
    }

    codec = avcodec_find_decoder(enc->codec_id);
    if (!codec ||
        avcodec_open(enc, codec) < 0)
        return -1;
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    switch(enc->codec_type) {
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    case CODEC_TYPE_AUDIO:
        is->audio_stream = stream_index;
        is->audio_st = ic->streams[stream_index];
        is->audio_buf_size = 0;
        is->audio_buf_index = 0;
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        /* init averaging filter */
        is->audio_diff_avg_coef = exp(log(0.01) / AUDIO_DIFF_AVG_NB);
        is->audio_diff_avg_count = 0;
        /* since we do not have a precise anough audio fifo fullness,
           we correct audio sync only if larger than this threshold */
        is->audio_diff_threshold = 2.0 * SDL_AUDIO_BUFFER_SIZE / enc->sample_rate;

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        memset(&is->audio_pkt, 0, sizeof(is->audio_pkt));
        packet_queue_init(&is->audioq);
	SDL_PauseAudio(0);
        break;
    case CODEC_TYPE_VIDEO:
        is->video_stream = stream_index;
        is->video_st = ic->streams[stream_index];

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        is->frame_last_delay = 40e-3;
        is->frame_timer = (double)av_gettime() / 1000000.0;
        is->video_current_pts_time = av_gettime();

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        packet_queue_init(&is->videoq);
        is->video_tid = SDL_CreateThread(video_thread, is);
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        enc->debug = debug;
        enc->debug_mv = debug_mv;
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        break;
    default:
        break;
    }
    return 0;
}

static void stream_component_close(VideoState *is, int stream_index)
{
    AVFormatContext *ic = is->ic;
    AVCodecContext *enc;
    
    enc = &ic->streams[stream_index]->codec;

    switch(enc->codec_type) {
    case CODEC_TYPE_AUDIO:
        packet_queue_abort(&is->audioq);

        SDL_CloseAudio();

        packet_queue_end(&is->audioq);
        break;
    case CODEC_TYPE_VIDEO:
        packet_queue_abort(&is->videoq);

        /* note: we also signal this mutex to make sure we deblock the
           video thread in all cases */
        SDL_LockMutex(is->pictq_mutex);
        SDL_CondSignal(is->pictq_cond);
        SDL_UnlockMutex(is->pictq_mutex);

        SDL_WaitThread(is->video_tid, NULL);

        packet_queue_end(&is->videoq);
        break;
    default:
        break;
    }

    avcodec_close(enc);
    switch(enc->codec_type) {
    case CODEC_TYPE_AUDIO:
        is->audio_st = NULL;
        is->audio_stream = -1;
        break;
    case CODEC_TYPE_VIDEO:
        is->video_st = NULL;
        is->video_stream = -1;
        break;
    default:
        break;
    }
}

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void dump_stream_info(AVFormatContext *s)
{
    if (s->track != 0)
        fprintf(stderr, "Track: %d\n", s->track);
    if (s->title[0] != '\0')
        fprintf(stderr, "Title: %s\n", s->title);
    if (s->author[0] != '\0')
        fprintf(stderr, "Author: %s\n", s->author);
    if (s->album[0] != '\0')
        fprintf(stderr, "Album: %s\n", s->album);
    if (s->year != 0)
        fprintf(stderr, "Year: %d\n", s->year);
    if (s->genre[0] != '\0')
        fprintf(stderr, "Genre: %s\n", s->genre);
}

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/* since we have only one decoding thread, we can use a global
   variable instead of a thread local variable */
static VideoState *global_video_state;

static int decode_interrupt_cb(void)
{
    return (global_video_state && global_video_state->abort_request);
}
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/* this thread gets the stream from the disk or the network */
static int decode_thread(void *arg)
{
    VideoState *is = arg;
    AVFormatContext *ic;
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    int err, i, ret, video_index, audio_index, use_play;
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    AVPacket pkt1, *pkt = &pkt1;
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    AVFormatParameters params, *ap = &params;
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    video_index = -1;
    audio_index = -1;
    is->video_stream = -1;
    is->audio_stream = -1;

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    global_video_state = is;
    url_set_interrupt_cb(decode_interrupt_cb);

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    memset(ap, 0, sizeof(*ap));
    ap->image_format = image_format;
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    ap->initial_pause = 1; /* we force a pause when starting an RTSP
                              stream */
    
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    err = av_open_input_file(&ic, is->filename, is->iformat, 0, ap);
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    if (err < 0) {
        print_error(is->filename, err);
        ret = -1;
        goto fail;
    }
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    is->ic = ic;
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#ifdef CONFIG_NETWORK
    use_play = (ic->iformat == &rtsp_demux);
#else
    use_play = 0;
#endif
    if (!use_play) {
        err = av_find_stream_info(ic);
        if (err < 0) {
            fprintf(stderr, "%s: could not find codec parameters\n", is->filename);
            ret = -1;
            goto fail;
        }
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    }
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    /* if seeking requested, we execute it */
    if (start_time != AV_NOPTS_VALUE) {
        int64_t timestamp;

        timestamp = start_time;
        /* add the stream start time */
        if (ic->start_time != AV_NOPTS_VALUE)
            timestamp += ic->start_time;
        ret = av_seek_frame(ic, -1, timestamp);
        if (ret < 0) {
            fprintf(stderr, "%s: could not seek to position %0.3f\n", 
                    is->filename, (double)timestamp / AV_TIME_BASE);
        }
    }

    /* now we can begin to play (RTSP stream only) */
    av_read_play(ic);

    if (use_play) {
        err = av_find_stream_info(ic);
        if (err < 0) {
            fprintf(stderr, "%s: could not find codec parameters\n", is->filename);
            ret = -1;
            goto fail;
        }
    }

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    for(i = 0; i < ic->nb_streams; i++) {
        AVCodecContext *enc = &ic->streams[i]->codec;
        switch(enc->codec_type) {
        case CODEC_TYPE_AUDIO:
            if (audio_index < 0 && !audio_disable)
                audio_index = i;
            break;
        case CODEC_TYPE_VIDEO:
            if (video_index < 0 && !video_disable)
                video_index = i;
            break;
        default:
            break;
        }
    }
    if (show_status) {
        dump_format(ic, 0, is->filename, 0);
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        dump_stream_info(ic);
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    }

    /* open the streams */
    if (audio_index >= 0) {
        stream_component_open(is, audio_index);
    }

    if (video_index >= 0) {
        stream_component_open(is, video_index);
    } else {
        if (!display_disable)
            is->show_audio = 1;
    }

    if (is->video_stream < 0 && is->audio_stream < 0) {
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        fprintf(stderr, "%s: could not open codecs\n", is->filename);
        ret = -1;
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        goto fail;
    }

    for(;;) {
        if (is->abort_request)
            break;
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#ifdef CONFIG_NETWORK
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        if (is->paused != is->last_paused) {
            is->last_paused = is->paused;
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            if (is->paused)
                av_read_pause(ic);
            else
                av_read_play(ic);
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        }
        if (is->paused && ic->iformat == &rtsp_demux) {
            /* wait 10 ms to avoid trying to get another packet */
            /* XXX: horrible */
            SDL_Delay(10);
            continue;
        }
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#endif
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        if (is->seek_req) {
            /* XXX: must lock decoder threads */
            ret = av_seek_frame(is->ic, -1, is->seek_pos);
            if (ret < 0) {
                fprintf(stderr, "%s: error while seeking\n", is->ic->filename);
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            }else{
                if (is->audio_stream >= 0) {
                    packet_queue_flush(&is->audioq);
                }
                if (is->video_stream >= 0) {
                    packet_queue_flush(&is->videoq);
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                    avcodec_flush_buffers(&ic->streams[video_index]->codec);
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                }
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            }
            is->seek_req = 0;
        }
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        /* if the queue are full, no need to read more */
        if (is->audioq.size > MAX_AUDIOQ_SIZE ||
            is->videoq.size > MAX_VIDEOQ_SIZE) {
            /* wait 10 ms */
            SDL_Delay(10);
            continue;
        }
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        ret = av_read_frame(ic, pkt);
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        if (ret < 0) {
            break;
        }
        if (pkt->stream_index == is->audio_stream) {
            packet_queue_put(&is->audioq, pkt);
        } else if (pkt->stream_index == is->video_stream) {
            packet_queue_put(&is->videoq, pkt);
        } else {
            av_free_packet(pkt);
        }
    }
    /* wait until the end */
    while (!is->abort_request) {
        SDL_Delay(100);
    }

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    ret = 0;
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    /* disable interrupting */
    global_video_state = NULL;