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// Y4M file parser by Rik Snel (using yuv4mpeg*.[ch] from
// mjpeg.sourceforge.net) (derived from demux_viv.c)
// older YUV4MPEG (used by xawtv) support by Alex Beregszaszi
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h> /* strtok */
#include "config.h"
#include "mp_msg.h"
#include "help_mp.h"
#include "yuv4mpeg.h"
//#include "stream.h"
#include "demuxer.h"
#include "stheader.h"
#include "bswap.h"
typedef struct {
int framenum;
y4m_stream_info_t* si;
int is_older;
} y4m_priv_t;
int y4m_check_file(demuxer_t* demuxer){
int orig_pos = stream_tell(demuxer->stream);
char buf[10];
y4m_priv_t* priv;
mp_msg(MSGT_DEMUX, MSGL_V, "Checking for YUV4MPEG2\n");
stream_read(demuxer->stream, buf, 9);
buf[9] = 0;
if (strncmp("YUV4MPEG2", buf, 9) && strncmp("YUV4MPEG ", buf, 9)) {
mp_msg(MSGT_DEMUX, MSGL_DBG2, "Failed: YUV4MPEG2\n");
return 0;
}
demuxer->priv = malloc(sizeof(y4m_priv_t));
priv = demuxer->priv;
priv->is_older = 0;
if (!strncmp("YUV4MPEG ", buf, 9))
{
mp_msg(MSGT_DEMUX, MSGL_V, "Found older YUV4MPEG format (used by xawtv)\n");
priv->is_older = 1;
}
mp_msg(MSGT_DEMUX,MSGL_DBG2,"Success: YUV4MPEG2\n");
stream_seek(demuxer->stream, orig_pos);
return 1;
}
// return value:
// 0 = EOF or no stream found
// 1 = successfully read a packet
int demux_y4m_fill_buffer(demuxer_t *demux) {
demux_stream_t *ds=demux->video;
demux_packet_t *dp;
y4m_priv_t *priv=demux->priv;
y4m_frame_info_t fi;
unsigned char *buf[3];
int err, size;
demux->filepos=stream_tell(demux->stream);
size = ((sh_video_t*)ds->sh)->disp_w*((sh_video_t*)ds->sh)->disp_h;
dp = new_demux_packet(3*size/2);
/* swap U and V components */
buf[0] = dp->buffer;
buf[1] = dp->buffer + 5*size/4;
buf[2] = dp->buffer + size;
if (priv->is_older)
{
int c;
c = stream_read_char(demux->stream); /* F */
if (c == -256)
return 0; /* EOF */
if (c != 'F')
{
mp_msg(MSGT_DEMUX, MSGL_V, "Bad frame at %d\n", (int)stream_tell(demux->stream)-1);
return 0;
}
stream_skip(demux->stream, 5); /* RAME\n */
stream_read(demux->stream, buf[0], size);
stream_read(demux->stream, buf[1], size/4);
stream_read(demux->stream, buf[2], size/4);
}
else
{
if ((err=y4m_read_frame(demux->stream, priv->si, &fi, buf)) != Y4M_OK) {
mp_msg(MSGT_DEMUX, MSGL_V, "error reading frame %s\n", y4m_strerr(err));
return 0;
}
}
/* This seems to be the right way to calculate the presentation time stamp */
dp->pts=(float)priv->framenum/((sh_video_t*)ds->sh)->fps;
priv->framenum++;
dp->pos=demux->filepos;
dp->flags=0;
ds_add_packet(ds, dp);
return 1;
}
void demux_open_y4m(demuxer_t* demuxer){
y4m_priv_t* priv = demuxer->priv;
y4m_ratio_t ratio;
sh_video_t* sh=new_sh_video(demuxer,0);
int err;
priv->framenum = 0;
priv->si = malloc(sizeof(y4m_stream_info_t));
if (priv->is_older)
{
char buf[4];
int frame_rate_code;
stream_skip(demuxer->stream, 8); /* YUV4MPEG */
stream_skip(demuxer->stream, 1); /* space */
stream_read(demuxer->stream, (char *)&buf[0], 3);
buf[3] = 0;
sh->disp_w = atoi(buf);
stream_skip(demuxer->stream, 1); /* space */
stream_read(demuxer->stream, (char *)&buf[0], 3);
buf[3] = 0;
sh->disp_h = atoi(buf);
stream_skip(demuxer->stream, 1); /* space */
stream_read(demuxer->stream, (char *)&buf[0], 1);
buf[1] = 0;
frame_rate_code = atoi(buf);
stream_skip(demuxer->stream, 1); /* new-line */
if (!sh->fps)
{
/* values from xawtv */
switch(frame_rate_code)
{
case 1:
sh->fps = 23.976f;
break;
case 2:
sh->fps = 24.0f;
break;
case 3:
sh->fps = 25.0f;
break;
case 4:
sh->fps = 29.97f;
break;
case 5:
sh->fps = 30.0f;
break;
case 6:
sh->fps = 50.0f;
break;
case 7:
sh->fps = 59.94f;
break;
case 8:
sh->fps = 60.0f;
break;
default:
sh->fps = 25.0f;
}
}
sh->frametime = 1.0f/sh->fps;
}
else
{
y4m_init_stream_info(priv->si);
if ((err=y4m_read_stream_header(demuxer->stream, priv->si)) != Y4M_OK)
mp_msg(MSGT_DEMUXER, MSGL_FATAL, "error parsing YUV4MPEG header: %s\n", y4m_strerr(err));
if(!sh->fps) {
ratio = y4m_si_get_framerate(priv->si);
if (ratio.d != 0)
sh->fps=(float)ratio.n/(float)ratio.d;
else
sh->fps=15.0f;
}
sh->frametime=1.0f/sh->fps;
ratio = y4m_si_get_sampleaspect(priv->si);
if (ratio.d != 0 && ratio.n != 0)
sh->aspect = (float)ratio.n/(float)ratio.d;
sh->disp_w = y4m_si_get_width(priv->si);
sh->disp_h = y4m_si_get_height(priv->si);
demuxer->seekable = 0;
}
sh->format = mmioFOURCC('Y', 'V', '1', '2');
sh->bih=malloc(sizeof(BITMAPINFOHEADER));
memset(sh->bih,0,sizeof(BITMAPINFOHEADER));
sh->bih->biSize=40;
sh->bih->biWidth = sh->disp_w;
sh->bih->biHeight = sh->disp_h;
sh->bih->biPlanes=3;
sh->bih->biBitCount=12;
sh->bih->biCompression=sh->format;
sh->bih->biSizeImage=sh->bih->biWidth*sh->bih->biHeight*3/2; /* YV12 */
demuxer->video->sh=sh;
sh->ds=demuxer->video;
demuxer->video->id=0;
mp_msg(MSGT_DEMUX, MSGL_INFO, "YUV4MPEG2 Video stream %d size: display: %dx%d, codec: %ux%u\n",
demuxer->video->id, sh->disp_w, sh->disp_h, sh->bih->biWidth,
sh->bih->biHeight);
}
int demux_seek_y4m(demuxer_t *demuxer, float rel_seek_secs, int flags) {
sh_video_t* sh = demuxer->video->sh;
y4m_priv_t* priv = demuxer->priv;
int rel_seek_frames = sh->fps*rel_seek_secs;
int size = 3*sh->disp_w*sh->disp_h/2;
off_t curr_pos = stream_tell(demuxer->stream);
if (priv->framenum + rel_seek_frames < 0) rel_seek_frames = -priv->framenum;
//printf("seektoframe=%d rel_seek_secs=%f seektooffset=%ld\n", priv->framenum + rel_seek_frames, rel_seek_secs, curr_pos + rel_seek_frames*(size+6));
//printf("framenum=%d, curr_pos=%ld, currpos/(size+6)=%f\n", priv->framenum, curr_pos, (float)curr_pos/(float)(size+6));
priv->framenum += rel_seek_frames;
if (priv->is_older) {
/* Well this is easy: every frame takes up size+6 bytes
* in the stream and we may assume that the stream pointer
* is always at the beginning of a frame.
* framenum is the number of the frame that is about to be
* demuxed (counting from ONE (see demux_open_y4m)) */
stream_seek(demuxer->stream, curr_pos + rel_seek_frames*(size+6));
} else {
/* should never come here, because seeking for YUV4MPEG2
* is disabled. */
mp_msg(MSGT_DEMUX, MSGL_WARN, "Seeking for YUV4MPEG2 not yet implemented!\n");
}
return 0;
}
void demux_close_y4m(demuxer_t *demuxer)
{
y4m_priv_t* priv = demuxer->priv;
if (!priv->is_older)
y4m_fini_stream_info(((y4m_priv_t*)demuxer->priv)->si);
free(((y4m_priv_t*)demuxer->priv)->si);
free(demuxer->priv);
return;
}
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