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mpv/libmpdemux/video.c

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// read video frame
#include "config.h"
#include <stdio.h>
#ifdef HAVE_MALLOC_H
#include <malloc.h>
#endif
#include <stdlib.h>
#include <unistd.h>
#include "mp_msg.h"
#include "help_mp.h"
#include "stream.h"
#include "demuxer.h"
#include "stheader.h"
#include "parse_es.h"
#include "mpeg_hdr.h"
static mp_mpeg_header_t picture;
int video_read_properties(sh_video_t *sh_video){
demux_stream_t *d_video=sh_video->ds;
// Determine image properties:
switch(d_video->demuxer->file_format){
case DEMUXER_TYPE_AVI:
case DEMUXER_TYPE_ASF: {
// display info:
sh_video->format=sh_video->bih->biCompression;
sh_video->disp_w=sh_video->bih->biWidth;
sh_video->disp_h=abs(sh_video->bih->biHeight);
break;
}
case DEMUXER_TYPE_MPEG_ES:
case DEMUXER_TYPE_MPEG_PS: {
// Find sequence_header first:
videobuf_len=0; videobuf_code_len=0;
mp_msg(MSGT_DECVIDEO,MSGL_V,"Searching for sequence header... ");fflush(stdout);
while(1){
int i=sync_video_packet(d_video);
if(i==0x1B3) break; // found it!
if(!i || !skip_video_packet(d_video)){
if(verbose) mp_msg(MSGT_DECVIDEO,MSGL_V,"NONE :(\n");
mp_msg(MSGT_DECVIDEO,MSGL_ERR,MSGTR_MpegNoSequHdr);
return 0;
}
}
mp_msg(MSGT_DECVIDEO,MSGL_V,"OK!\n");
// sh_video=d_video->sh;sh_video->ds=d_video;
// mpeg2_init();
// ========= Read & process sequence header & extension ============
if(!videobuffer) videobuffer=(char*)memalign(8,VIDEOBUFFER_SIZE);
if(!videobuffer){
mp_msg(MSGT_DECVIDEO,MSGL_ERR,MSGTR_ShMemAllocFail);
return 0;
}
if(!read_video_packet(d_video)){
mp_msg(MSGT_DECVIDEO,MSGL_ERR,MSGTR_CannotReadMpegSequHdr);
return 0;
}
if(mp_header_process_sequence_header (&picture, &videobuffer[4])) {
mp_msg(MSGT_DECVIDEO,MSGL_ERR,MSGTR_BadMpegSequHdr);
return 0;
}
if(sync_video_packet(d_video)==0x1B5){ // next packet is seq. ext.
// videobuf_len=0;
int pos=videobuf_len;
if(!read_video_packet(d_video)){
mp_msg(MSGT_DECVIDEO,MSGL_ERR,MSGTR_CannotReadMpegSequHdrEx);
return 0;
}
if(mp_header_process_extension (&picture, &videobuffer[pos+4])) {
mp_msg(MSGT_DECVIDEO,MSGL_ERR,MSGTR_BadMpegSequHdrEx);
return 0;
}
}
// printf("picture.fps=%d\n",picture.fps);
// fill aspect info:
switch(picture.aspect_ratio_information){
case 2: // PAL/NTSC SVCD/DVD 4:3
case 4: // SECAM 4:3? - XXX check with more files!
case 8: // PAL VCD 4:3
case 12: // NTSC VCD 4:3
sh_video->aspect=4.0/3.0;
break;
case 3: // PAL/NTSC Widescreen SVCD/DVD 16:9
sh_video->aspect=16.0/9.0;
break;
default:
fprintf(stderr,"Detected unknown aspect_ratio_information in mpeg sequence header.\n"
"Please report the aspect value (%i) along with the movie type (VGA,PAL,NTSC,"
"SECAM) and the movie resolution (720x576,352x240,480x480,...) to the MPlayer"
" developers, so that we can add support for it!\nAssuming 1:1 aspect for now.\n",
picture.aspect_ratio_information);
case 1: // VGA 1:1 - do not prescale
sh_video->aspect=0.0;
break;
}
// display info:
sh_video->format=picture.mpeg1?0x10000001:0x10000002; // mpeg video
sh_video->fps=picture.fps*0.0001f;
if(!sh_video->fps){
// if(!force_fps){
// fprintf(stderr,"FPS not specified (or invalid) in the header! Use the -fps option!\n");
// return 0;
// }
sh_video->frametime=0;
} else {
sh_video->frametime=10000.0f/(float)picture.fps;
}
sh_video->disp_w=picture.display_picture_width;
sh_video->disp_h=picture.display_picture_height;
// bitrate:
if(picture.bitrate!=0x3FFFF) // unspecified/VBR ?
sh_video->i_bps=1000*picture.bitrate/16;
// info:
mp_dbg(MSGT_DECVIDEO,MSGL_DBG2,"mpeg bitrate: %d (%X)\n",picture.bitrate,picture.bitrate);
mp_msg(MSGT_DECVIDEO,MSGL_INFO,"VIDEO: %s %dx%d (aspect %d) %4.2f fps %5.1f kbps (%4.1f kbyte/s)\n",
picture.mpeg1?"MPEG1":"MPEG2",
sh_video->disp_w,sh_video->disp_h,
picture.aspect_ratio_information,
sh_video->fps,
picture.bitrate*0.5f,
picture.bitrate/16.0f );
break;
}
} // switch(file_format)
return 1;
}
int video_read_frame(sh_video_t* sh_video,float* frame_time_ptr,unsigned char** start,int force_fps){
demux_stream_t *d_video=sh_video->ds;
demuxer_t *demuxer=d_video->demuxer;
float frame_time=1;
float pts1=d_video->pts;
// unsigned char* start=NULL;
int in_size=0;
*start=NULL;
if(demuxer->file_format==DEMUXER_TYPE_MPEG_ES || demuxer->file_format==DEMUXER_TYPE_MPEG_PS){
int in_frame=0;
//float newfps;
//videobuf_len=0;
while(videobuf_len<VIDEOBUFFER_SIZE-MAX_VIDEO_PACKET_SIZE){
int i=sync_video_packet(d_video);
void* buffer=&videobuffer[videobuf_len+4];
if(in_frame){
if(i<0x101 || i>=0x1B0){ // not slice code -> end of frame
#if 1
// send END OF FRAME code:
videobuffer[videobuf_len+0]=0;
videobuffer[videobuf_len+1]=0;
videobuffer[videobuf_len+2]=1;
videobuffer[videobuf_len+3]=0xFF;
videobuf_len+=4;
#endif
if(!i) return -1; // EOF
break;
}
} else {
//if(i==0x100) in_frame=1; // picture startcode
if(i>=0x101 && i<0x1B0) in_frame=1; // picture startcode
else if(!i) return -1; // EOF
}
//if(grab_frames==2 && (i==0x1B3 || i==0x1B8)) grab_frames=1;
if(!read_video_packet(d_video)) return -1; // EOF
//printf("read packet 0x%X, len=%d\n",i,videobuf_len);
// process headers:
switch(i){
case 0x1B3: mp_header_process_sequence_header (&picture, buffer);break;
case 0x1B5: mp_header_process_extension (&picture, buffer);break;
}
}
// if(videobuf_len>max_framesize) max_framesize=videobuf_len; // debug
//printf("--- SEND %d bytes\n",videobuf_len);
// if(grab_frames==1){
// FILE *f=fopen("grab.mpg","ab");
// fwrite(videobuffer,videobuf_len-4,1,f);
// fclose(f);
// }
*start=videobuffer; in_size=videobuf_len;
//blit_frame=decode_video(video_out,sh_video,videobuffer,videobuf_len,drop_frame);
#if 1
// get mpeg fps:
//newfps=frameratecode2framerate[picture->frame_rate_code]*0.0001f;
if((int)(sh_video->fps*10000+0.5)!=picture.fps) if(!force_fps){
mp_msg(MSGT_CPLAYER,MSGL_WARN,"Warning! FPS changed %5.3f -> %5.3f (%f) [%d] \n",sh_video->fps,picture.fps*0.0001,sh_video->fps-picture.fps*0.0001,picture.frame_rate_code);
sh_video->fps=picture.fps*0.0001;
sh_video->frametime=10000.0f/(float)picture.fps;
}
#endif
// fix mpeg2 frametime:
frame_time=(picture.display_time)*0.01f;
picture.display_time=100;
videobuf_len=0;
} else {
// frame-based file formats: (AVI,ASF,MOV)
in_size=ds_get_packet(d_video,start);
if(in_size<0) return -1; // EOF
// if(in_size>max_framesize) max_framesize=in_size;
// blit_frame=decode_video(video_out,sh_video,start,in_size,drop_frame);
}
// vdecode_time=video_time_usage-vdecode_time;
//------------------------ frame decoded. --------------------
// Increase video timers:
sh_video->num_frames+=frame_time;
++sh_video->num_frames_decoded;
frame_time*=sh_video->frametime;
if(demuxer->file_format==DEMUXER_TYPE_ASF && !force_fps){
// .ASF files has no fixed FPS - just frame durations!
float d=d_video->pts-pts1;
if(d>=0 && d<5) frame_time=d;
if(d>0){
if(verbose)
if((int)sh_video->fps==1000)
mp_msg(MSGT_CPLAYER,MSGL_STATUS,"\rASF framerate: %d fps \n",(int)(1.0f/d));
sh_video->frametime=d; // 1ms
sh_video->fps=1.0f/d;
}
} else
if(demuxer->file_format==DEMUXER_TYPE_MOV && !force_fps){
// .MOV files has no fixed FPS - just frame durations!
frame_time=d_video->pts-pts1;
}
if(demuxer->file_format==DEMUXER_TYPE_MPEG_PS) d_video->pts+=frame_time;
if(frame_time_ptr) *frame_time_ptr=frame_time;
return in_size;
}
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