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ffmpeg/ffplay.c
Michael Niedermayer e8d83e1c26 Small Patch for "ffplay -" instead of "ffplay pipe:" by (Bill Eldridge <bill at rfa dot org>) 
Originally committed as revision 2181 to svn://svn.ffmpeg.org/ffmpeg/trunk
2003-08-29 20:22:16 +00:00

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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 "common.h"
#include "avformat.h"
#include "cmdutils.h"
#include <SDL.h>
#include <SDL_thread.h>
#ifdef CONFIG_WIN32
#undef main /* We don't want SDL to override our main() */
#endif
#if defined(__linux__)
#define HAVE_X11
#endif
#ifdef HAVE_X11
#include <X11/Xlib.h>
#endif
//#define DEBUG_SYNC
#define MAX_VIDEOQ_SIZE (5 * 256 * 1024)
#define MAX_AUDIOQ_SIZE (5 * 16 * 1024)
/* 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
/* 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 {
double pts; /* presentation time stamp for this picture */
SDL_Overlay *bmp;
int width, height; /* source height & width */
int allocated;
} VideoPicture;
enum {
AV_SYNC_AUDIO_MASTER, /* default choice */
AV_SYNC_VIDEO_MASTER,
AV_SYNC_EXTERNAL_CLOCK, /* synchronize to an external clock */
};
typedef struct VideoState {
SDL_Thread *parse_tid;
SDL_Thread *video_tid;
AVInputFormat *iformat;
int no_background;
int abort_request;
int paused;
int last_paused;
AVFormatContext *ic;
int dtg_active_format;
int audio_stream;
int av_sync_type;
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;
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;
int64_t audio_pkt_ipts;
int show_audio; /* if true, display audio samples */
int16_t sample_array[SAMPLE_ARRAY_SIZE];
int sample_array_index;
int last_i_start;
double frame_timer;
double frame_last_pts;
double frame_last_delay;
double video_clock;
int video_stream;
AVStream *video_st;
PacketQueue videoq;
int64_t ipts;
int picture_start; /* true if picture starts */
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 */
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);
static int audio_write_get_buf_size(VideoState *is);
/* options specified by the user */
static AVInputFormat *file_iformat;
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;
static int av_sync_type = AV_SYNC_AUDIO_MASTER;
/* current context */
static int is_full_screen;
static VideoState *cur_stream;
static int64_t audio_callback_time;
#define FF_ALLOC_EVENT (SDL_USEREVENT)
#define FF_REFRESH_EVENT (SDL_USEREVENT + 1)
#define FF_QUIT_EVENT (SDL_USEREVENT + 2)
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();
}
static void packet_queue_end(PacketQueue *q)
{
AVPacketList *pkt, *pkt1;
for(pkt = q->first_pkt; pkt != NULL; pkt = pkt1) {
pkt1 = pkt->next;
av_free_packet(&pkt->pkt);
}
SDL_DestroyMutex(q->mutex);
SDL_DestroyCond(q->cond);
}
static int packet_queue_put(PacketQueue *q, AVPacket *pkt)
{
AVPacketList *pkt1;
pkt1 = av_malloc(sizeof(AVPacketList));
if (!pkt1)
return -1;
pkt1->pkt = *pkt;
pkt1->next = NULL;
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 */
aspect_ratio = is->video_st->codec.aspect_ratio;
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;
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;
}
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);
}
/* 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;
delta = (av_gettime() - is->video_current_pts_time) / 1000000.0;
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;
if (is->av_sync_type == AV_SYNC_VIDEO_MASTER && is->video_st)
val = get_video_clock(is);
else if (is->av_sync_type == AV_SYNC_AUDIO_MASTER && is->audio_st)
val = get_audio_clock(is);
else
val = get_external_clock(is);
return val;
}
/* called to display each frame */
static void video_refresh_timer(void *opaque)
{
VideoState *is = opaque;
VideoPicture *vp;
double actual_delay, delay, sync_threshold, ref_clock, diff;
if (is->video_st) {
if (is->pictq_size == 0) {
/* if no picture, need to wait */
schedule_refresh(is, 40);
} else {
/* dequeue the picture */
vp = &is->pictq[is->pictq_rindex];
/* 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;
}
/* launch timer for next picture */
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
/* 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;
double av_diff;
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;
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);
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;
int is_yuv;
vp = &is->pictq[is->pictq_windex];
if (vp->bmp)
SDL_FreeYUVOverlay(vp->bmp);
/* XXX: use generic function */
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;
}
if (is_yuv) {
vp->bmp = SDL_CreateYUVOverlay(is->video_st->codec.width,
is->video_st->codec.height,
SDL_YV12_OVERLAY,
screen);
} else {
#if 0
vp->bmp = bmp_alloc(screen,
is->video_st->codec.width,
is->video_st->codec.height,
screen->bitmap_format,
0);
#endif
vp->bmp = NULL;
}
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);
}
static int queue_picture(VideoState *is, AVFrame *src_frame, double pts)
{
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;
}
/* if the frame is not skipped, then display it */
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,
(AVPicture *)src_frame, is->video_st->codec.pix_fmt,
is->video_st->codec.width, is->video_st->codec.height);
/* update the bitmap content */
SDL_UnlockYUVOverlay(vp->bmp);
vp->pts = pts;
/* 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);
}
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;
}
if (pts != 0) {
/* update video clock with pts, if present */
is->video_clock = pts;
} else {
frame_delay = (double)is->video_st->codec.frame_rate_base /
(double)is->video_st->codec.frame_rate;
is->video_clock += frame_delay;
/* for MPEG2, the frame can be repeated, so we update the
clock accordingly */
if (src_frame->repeat_pict) {
is->video_clock += src_frame->repeat_pict * (frame_delay * 0.5);
}
}
#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",
ftype, is->video_clock, pts1);
}
#endif
return queue_picture(is, src_frame, is->video_clock);
}
static int video_thread(void *arg)
{
VideoState *is = arg;
AVPacket pkt1, *pkt = &pkt1;
unsigned char *ptr;
int len, len1, got_picture;
AVFrame frame;
int64_t ipts;
double pts;
for(;;) {
while (is->paused && !is->videoq.abort_request) {
SDL_Delay(10);
}
if (packet_queue_get(&is->videoq, pkt, 1) < 0)
break;
/* NOTE: ipts is the PTS of the _first_ picture beginning in
this packet, if any */
ipts = pkt->pts;
ptr = pkt->data;
if (is->video_st->codec.codec_id == CODEC_ID_RAWVIDEO) {
avpicture_fill((AVPicture *)&frame, ptr,
is->video_st->codec.pix_fmt,
is->video_st->codec.width,
is->video_st->codec.height);
pts = 0;
if (ipts != AV_NOPTS_VALUE)
pts = (double)ipts * is->ic->pts_num / is->ic->pts_den;
frame.pict_type = FF_I_TYPE;
if (output_picture2(is, &frame, pts) < 0)
goto the_end;
} else {
len = pkt->size;
while (len > 0) {
if (is->picture_start) {
is->ipts = ipts;
is->picture_start = 0;
ipts = AV_NOPTS_VALUE;
}
len1 = avcodec_decode_video(&is->video_st->codec,
&frame, &got_picture, ptr, len);
if (len1 < 0)
break;
if (got_picture) {
pts = 0;
if (is->ipts != AV_NOPTS_VALUE)
pts = (double)is->ipts * is->ic->pts_num / is->ic->pts_den;
if (output_picture2(is, &frame, pts) < 0)
goto the_end;
is->picture_start = 1;
}
ptr += len1;
len -= len1;
}
}
av_free_packet(pkt);
}
the_end:
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,
int samples_size1, double pts)
{
int n, samples_size;
double ref_clock;
n = 2 * is->audio_st->codec.channels;
samples_size = samples_size1;
/* 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) ||
is->av_sync_type == AV_SYNC_EXTERNAL_CLOCK)) {
double diff, avg_diff;
int wanted_size, min_size, max_size, nb_samples;
ref_clock = get_master_clock(is);
diff = get_audio_clock(is) - ref_clock;
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
}
} 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;
}
}
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;
int len1, data_size;
double pts;
for(;;) {
if (is->paused || is->audioq.abort_request) {
return -1;
}
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);
if (len1 < 0)
break;
is->audio_pkt_data += len1;
is->audio_pkt_size -= len1;
if (data_size > 0) {
pts = 0;
if (is->audio_pkt_ipts != AV_NOPTS_VALUE)
pts = (double)is->audio_pkt_ipts * is->ic->pts_num / is->ic->pts_den;
/* if no pts, then compute it */
if (pts != 0) {
is->audio_clock = pts;
} else {
int n;
n = 2 * is->audio_st->codec.channels;
is->audio_clock += (double)data_size / (double)(n * is->audio_st->codec.sample_rate);
}
#if defined(DEBUG_SYNC)
{
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;
}
#endif
*pts_ptr = is->audio_clock;
is->audio_pkt_ipts = AV_NOPTS_VALUE;
/* we got samples : we can exit now */
return data_size;
}
}
/* free previous packet if any */
if (pkt->destruct)
av_free_packet(pkt);
/* 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;
is->audio_pkt_ipts = pkt->pts;
}
}
/* 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)
{
return is->audio_hw_buf_size - is->audio_buf_index;
}
/* 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;
/* hack for AC3. XXX: suppress that */
if (enc->channels > 2)
enc->channels = 2;
wanted_spec.channels = enc->channels;
wanted_spec.silence = 0;
wanted_spec.samples = SDL_AUDIO_BUFFER_SIZE;
wanted_spec.callback = sdl_audio_callback;
wanted_spec.userdata = is;
if (SDL_OpenAudio(&wanted_spec, &spec) < 0) {
fprintf(stderr, "SDL_OpenAudio: %s\n", SDL_GetError());
return -1;
}
is->audio_hw_buf_size = spec.size;
}
codec = avcodec_find_decoder(enc->codec_id);
if (!codec ||
avcodec_open(enc, codec) < 0)
return -1;
switch(enc->codec_type) {
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;
is->audio_pkt_size = 0;
/* 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;
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];
is->frame_last_delay = 40e-3;
is->frame_timer = (double)av_gettime() / 1000000.0;
is->picture_start = 1;
is->video_current_pts_time = av_gettime();
packet_queue_init(&is->videoq);
is->video_tid = SDL_CreateThread(video_thread, is);
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;
}
}
/* 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);
}
/* this thread gets the stream from the disk or the network */
static int decode_thread(void *arg)
{
VideoState *is = arg;
AVFormatContext *ic;
int err, i, ret, video_index, audio_index;
AVPacket pkt1, *pkt = &pkt1;
video_index = -1;
audio_index = -1;
is->video_stream = -1;
is->audio_stream = -1;
global_video_state = is;
url_set_interrupt_cb(decode_interrupt_cb);
err = av_open_input_file(&ic, is->filename, is->iformat, 0, NULL);
if (err < 0) {
print_error(is->filename, err);
ret = -1;
goto fail;
}
is->ic = ic;
err = av_find_stream_info(ic);
if (err < 0) {
fprintf(stderr, "%s: could not find codec parameters\n", is->filename);
ret = -1;
goto fail;
}
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);
}
/* 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) {
fprintf(stderr, "%s: could not open codecs\n", is->filename);
ret = -1;
goto fail;
}
for(;;) {
if (is->abort_request)
break;
#ifdef CONFIG_NETWORK
if (is->paused != is->last_paused) {
is->last_paused = is->paused;
if (ic->iformat == &rtsp_demux) {
if (is->paused)
rtsp_pause(ic);
else
rtsp_resume(ic);
}
}
if (is->paused && ic->iformat == &rtsp_demux) {
/* wait 10 ms to avoid trying to get another packet */
/* XXX: horrible */
SDL_Delay(10);
continue;
}
#endif
/* 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;
}
ret = av_read_packet(ic, pkt);
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);
}
ret = 0;
fail:
/* disable interrupting */
global_video_state = NULL;
/* close each stream */
if (is->audio_stream >= 0)
stream_component_close(is, is->audio_stream);
if (is->video_stream >= 0)
stream_component_close(is, is->video_stream);
if (is->ic) {
av_close_input_file(is->ic);
is->ic = NULL; /* safety */
}
url_set_interrupt_cb(NULL);
if (ret != 0) {
SDL_Event event;
event.type = FF_QUIT_EVENT;
event.user.data1 = is;
SDL_PushEvent(&event);
}
return 0;
}
/* pause or resume the video */
static void stream_pause(VideoState *is)
{
is->paused = !is->paused;
}
static VideoState *stream_open(const char *filename, AVInputFormat *iformat)
{
VideoState *is;
is = av_mallocz(sizeof(VideoState));
if (!is)
return NULL;
pstrcpy(is->filename, sizeof(is->filename), filename);
is->iformat = iformat;
if (screen) {
is->width = screen->w;
is->height = screen->h;
}
is->ytop = 0;
is->xleft = 0;
/* start video display */
is->pictq_mutex = SDL_CreateMutex();
is->pictq_cond = SDL_CreateCond();
/* add the refresh timer to draw the picture */
schedule_refresh(is, 40);
is->av_sync_type = av_sync_type;
is->parse_tid = SDL_CreateThread(decode_thread, is);
if (!is->parse_tid) {
av_free(is);
return NULL;
}
return is;
}
static void stream_close(VideoState *is)
{
VideoPicture *vp;
int i;
/* XXX: use a special url_shutdown call to abort parse cleanly */
is->abort_request = 1;
SDL_WaitThread(is->parse_tid, NULL);
/* free all pictures */
for(i=0;i<VIDEO_PICTURE_QUEUE_SIZE; i++) {
vp = &is->pictq[i];
if (vp->bmp) {
SDL_FreeYUVOverlay(vp->bmp);
vp->bmp = NULL;
}
}
SDL_DestroyMutex(is->pictq_mutex);
SDL_DestroyCond(is->pictq_cond);
}
void stream_cycle_channel(VideoState *is, int codec_type)
{
AVFormatContext *ic = is->ic;
int start_index, stream_index;
AVStream *st;
if (codec_type == CODEC_TYPE_VIDEO)
start_index = is->video_stream;
else
start_index = is->audio_stream;
if (start_index < 0)
return;
stream_index = start_index;
for(;;) {
if (++stream_index >= is->ic->nb_streams)
stream_index = 0;
if (stream_index == start_index)
return;
st = ic->streams[stream_index];
if (st->codec.codec_type == codec_type) {
/* check that parameters are OK */
switch(codec_type) {
case CODEC_TYPE_AUDIO:
if (st->codec.sample_rate != 0 &&
st->codec.channels != 0)
goto the_end;
break;
case CODEC_TYPE_VIDEO:
goto the_end;
default:
break;
}
}
}
the_end:
stream_component_close(is, start_index);
stream_component_open(is, stream_index);
}
void toggle_full_screen(void)
{
int w, h, flags;
is_full_screen = !is_full_screen;
if (!fs_screen_width) {
/* use default SDL method */
SDL_WM_ToggleFullScreen(screen);
} else {
/* use the recorded resolution */
flags = SDL_HWSURFACE|SDL_ASYNCBLIT|SDL_HWACCEL;
if (is_full_screen) {
w = fs_screen_width;
h = fs_screen_height;
flags |= SDL_FULLSCREEN;
} else {
w = screen_width;
h = screen_height;
flags |= SDL_RESIZABLE;
}
screen = SDL_SetVideoMode(w, h, 0, flags);
cur_stream->width = w;
cur_stream->height = h;
}
}
void toggle_pause(void)
{
if (cur_stream)
stream_pause(cur_stream);
}
void do_exit(void)
{
if (cur_stream) {
stream_close(cur_stream);
cur_stream = NULL;
}
if (show_status)
printf("\n");
SDL_Quit();
exit(0);
}
void toggle_audio_display(void)
{
if (cur_stream) {
cur_stream->show_audio = !cur_stream->show_audio;
}
}
/* handle an event sent by the GUI */
void event_loop(void)
{
SDL_Event event;
for(;;) {
SDL_WaitEvent(&event);
switch(event.type) {
case SDL_KEYDOWN:
switch(event.key.keysym.sym) {
case SDLK_ESCAPE:
case SDLK_q:
do_exit();
break;
case SDLK_f:
toggle_full_screen();
break;
case SDLK_p:
case SDLK_SPACE:
toggle_pause();
break;
case SDLK_a:
if (cur_stream)
stream_cycle_channel(cur_stream, CODEC_TYPE_AUDIO);
break;
case SDLK_v:
if (cur_stream)
stream_cycle_channel(cur_stream, CODEC_TYPE_VIDEO);
break;
case SDLK_w:
toggle_audio_display();
break;
default:
break;
}
break;
case SDL_VIDEORESIZE:
if (cur_stream) {
screen = SDL_SetVideoMode(event.resize.w, event.resize.h, 0,
SDL_HWSURFACE|SDL_RESIZABLE|SDL_ASYNCBLIT|SDL_HWACCEL);
cur_stream->width = event.resize.w;
cur_stream->height = event.resize.h;
}
break;
case SDL_QUIT:
case FF_QUIT_EVENT:
do_exit();
break;
case FF_ALLOC_EVENT:
alloc_picture(event.user.data1);
break;
case FF_REFRESH_EVENT:
video_refresh_timer(event.user.data1);
break;
default:
break;
}
}
}
void opt_width(const char *arg)
{
screen_width = atoi(arg);
}
void opt_height(const char *arg)
{
screen_height = atoi(arg);
}
static void opt_format(const char *arg)
{
file_iformat = av_find_input_format(arg);
if (!file_iformat) {
fprintf(stderr, "Unknown input format: %s\n", arg);
exit(1);
}
}
#ifdef CONFIG_NETWORK
void opt_rtp_tcp(void)
{
/* only tcp protocol */
rtsp_default_protocols = (1 << RTSP_PROTOCOL_RTP_TCP);
}
#endif
void opt_sync(const char *arg)
{
if (!strcmp(arg, "audio"))
av_sync_type = AV_SYNC_AUDIO_MASTER;
else if (!strcmp(arg, "video"))
av_sync_type = AV_SYNC_VIDEO_MASTER;
else if (!strcmp(arg, "ext"))
av_sync_type = AV_SYNC_EXTERNAL_CLOCK;
else
show_help();
}
const OptionDef options[] = {
{ "h", 0, {(void*)show_help}, "show help" },
{ "x", HAS_ARG, {(void*)opt_width}, "force displayed width", "width" },
{ "y", HAS_ARG, {(void*)opt_height}, "force displayed height", "height" },
#if 0
/* disabled as SDL/X11 does not support it correctly on application launch */
{ "fs", OPT_BOOL, {(void*)&is_full_screen}, "force full screen" },
#endif
{ "an", OPT_BOOL, {(void*)&audio_disable}, "disable audio" },
{ "vn", OPT_BOOL, {(void*)&video_disable}, "disable video" },
{ "nodisp", OPT_BOOL, {(void*)&display_disable}, "disable graphical display" },
{ "f", HAS_ARG, {(void*)opt_format}, "force format", "fmt" },
{ "stats", OPT_BOOL | OPT_EXPERT, {(void*)&show_status}, "show status", "" },
#ifdef CONFIG_NETWORK
{ "rtp_tcp", OPT_EXPERT, {(void*)&opt_rtp_tcp}, "force RTP/TCP protocol usage", "" },
#endif
{ "sync", HAS_ARG | OPT_EXPERT, {(void*)&opt_sync}, "set audio-video sync. type (type=audio/video/ext)", "type" },
{ NULL, },
};
void show_help(void)
{
printf("ffplay version " FFMPEG_VERSION ", Copyright (c) 2003 Fabrice Bellard\n"
"usage: ffplay [options] input_file\n"
"Simple media player\n");
printf("\n");
show_help_options(options, "Main options:\n",
OPT_EXPERT, 0);
show_help_options(options, "\nAdvanced options:\n",
OPT_EXPERT, OPT_EXPERT);
printf("\nWhile playing:\n"
"q, ESC quit\n"
"f toggle full screen\n"
"p, SPC pause\n"
"a cycle audio channel\n"
"v cycle video channel\n"
"w show audio waves\n"
);
exit(1);
}
void parse_arg_file(const char *filename)
{
if (!strcmp(filename, "-"))
filename = "pipe:";
input_filename = filename;
}
/* Called from the main */
int main(int argc, char **argv)
{
int flags, w, h;
/* register all codecs, demux and protocols */
av_register_all();
parse_options(argc, argv, options);
if (!input_filename)
show_help();
if (display_disable) {
video_disable = 1;
}
flags = SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_TIMER;
#ifndef CONFIG_WIN32
flags |= SDL_INIT_EVENTTHREAD; /* Not supported on win32 */
#endif
if (SDL_Init (flags)) {
fprintf(stderr, "Could not initialize SDL - exiting\n");
exit(1);
}
if (!display_disable) {
#ifdef HAVE_X11
/* save the screen resolution... SDL should allow full screen
by resizing the window */
{
Display *dpy;
dpy = XOpenDisplay(NULL);
if (dpy) {
fs_screen_width = DisplayWidth(dpy, DefaultScreen(dpy));
fs_screen_height = DisplayHeight(dpy, DefaultScreen(dpy));
XCloseDisplay(dpy);
}
}
#endif
flags = SDL_HWSURFACE|SDL_ASYNCBLIT|SDL_HWACCEL;
if (is_full_screen && fs_screen_width) {
w = fs_screen_width;
h = fs_screen_height;
flags |= SDL_FULLSCREEN;
} else {
w = screen_width;
h = screen_height;
flags |= SDL_RESIZABLE;
}
screen = SDL_SetVideoMode(w, h, 0, flags);
if (!screen) {
fprintf(stderr, "SDL: could not set video mode - exiting\n");
exit(1);
}
SDL_WM_SetCaption("FFplay", "FFplay");
}
SDL_EventState(SDL_ACTIVEEVENT, SDL_IGNORE);
SDL_EventState(SDL_MOUSEMOTION, SDL_IGNORE);
SDL_EventState(SDL_SYSWMEVENT, SDL_IGNORE);
SDL_EventState(SDL_USEREVENT, SDL_IGNORE);
cur_stream = stream_open(input_filename, file_iformat);
event_loop();
/* never returns */
return 0;
}
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