mirror of https://github.com/mpv-player/mpv
289 lines
7.3 KiB
C
289 lines
7.3 KiB
C
// Y4M file parser by Rik Snel (using yuv4mpeg*.[ch] from
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// mjpeg.sourceforge.net) (derived from demux_viv.c)
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// older YUV4MPEG (used by xawtv) support by Alex Beregszaszi
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h> /* strtok */
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#include "config.h"
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#include "mp_msg.h"
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#include "help_mp.h"
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#include "yuv4mpeg.h"
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//#include "stream/stream.h"
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#include "demuxer.h"
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#include "stheader.h"
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typedef struct {
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int framenum;
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y4m_stream_info_t* si;
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int is_older;
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} y4m_priv_t;
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static int y4m_check_file(demuxer_t* demuxer){
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int orig_pos = stream_tell(demuxer->stream);
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char buf[10];
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y4m_priv_t* priv;
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mp_msg(MSGT_DEMUX, MSGL_V, "Checking for YUV4MPEG2\n");
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if(stream_read(demuxer->stream, buf, 9)!=9)
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return 0;
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buf[9] = 0;
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if (strncmp("YUV4MPEG2", buf, 9) && strncmp("YUV4MPEG ", buf, 9)) {
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return 0;
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}
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demuxer->priv = malloc(sizeof(y4m_priv_t));
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priv = demuxer->priv;
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priv->is_older = 0;
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if (!strncmp("YUV4MPEG ", buf, 9))
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{
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mp_msg(MSGT_DEMUX, MSGL_V, "Found older YUV4MPEG format (used by xawtv)\n");
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priv->is_older = 1;
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}
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mp_msg(MSGT_DEMUX,MSGL_DBG2,"Success: YUV4MPEG2\n");
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stream_seek(demuxer->stream, orig_pos);
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return DEMUXER_TYPE_Y4M;
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}
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// return value:
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// 0 = EOF or no stream found
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// 1 = successfully read a packet
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static int demux_y4m_fill_buffer(demuxer_t *demux, demux_stream_t *dsds) {
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demux_stream_t *ds=demux->video;
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demux_packet_t *dp;
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y4m_priv_t *priv=demux->priv;
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y4m_frame_info_t fi;
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unsigned char *buf[3];
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int err, size;
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y4m_init_frame_info(&fi);
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demux->filepos=stream_tell(demux->stream);
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size = ((sh_video_t*)ds->sh)->disp_w*((sh_video_t*)ds->sh)->disp_h;
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dp = new_demux_packet(3*size/2);
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/* swap U and V components */
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buf[0] = dp->buffer;
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buf[1] = dp->buffer + 5*size/4;
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buf[2] = dp->buffer + size;
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if (priv->is_older)
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{
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int c;
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c = stream_read_char(demux->stream); /* F */
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if (c == -256)
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return 0; /* EOF */
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if (c != 'F')
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{
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mp_msg(MSGT_DEMUX, MSGL_V, "Bad frame at %d\n", (int)stream_tell(demux->stream)-1);
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return 0;
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}
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stream_skip(demux->stream, 5); /* RAME\n */
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stream_read(demux->stream, buf[0], size);
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stream_read(demux->stream, buf[1], size/4);
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stream_read(demux->stream, buf[2], size/4);
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}
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else
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{
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if ((err=y4m_read_frame(demux->stream, priv->si, &fi, buf)) != Y4M_OK) {
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mp_msg(MSGT_DEMUX, MSGL_V, "error reading frame %s\n", y4m_strerr(err));
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return 0;
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}
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}
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/* This seems to be the right way to calculate the presentation time stamp */
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dp->pts=(float)priv->framenum/((sh_video_t*)ds->sh)->fps;
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priv->framenum++;
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dp->pos=demux->filepos;
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dp->flags=0;
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ds_add_packet(ds, dp);
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return 1;
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}
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static demuxer_t* demux_open_y4m(demuxer_t* demuxer){
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y4m_priv_t* priv = demuxer->priv;
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y4m_ratio_t ratio;
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sh_video_t* sh=new_sh_video(demuxer,0);
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int err;
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priv->framenum = 0;
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priv->si = malloc(sizeof(y4m_stream_info_t));
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if (priv->is_older)
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{
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char buf[4];
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int frame_rate_code;
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stream_skip(demuxer->stream, 8); /* YUV4MPEG */
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stream_skip(demuxer->stream, 1); /* space */
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stream_read(demuxer->stream, (char *)&buf[0], 3);
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buf[3] = 0;
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sh->disp_w = atoi(buf);
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stream_skip(demuxer->stream, 1); /* space */
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stream_read(demuxer->stream, (char *)&buf[0], 3);
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buf[3] = 0;
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sh->disp_h = atoi(buf);
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stream_skip(demuxer->stream, 1); /* space */
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stream_read(demuxer->stream, (char *)&buf[0], 1);
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buf[1] = 0;
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frame_rate_code = atoi(buf);
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stream_skip(demuxer->stream, 1); /* new-line */
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if (!sh->fps)
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{
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/* values from xawtv */
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switch(frame_rate_code)
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{
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case 1:
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sh->fps = 23.976f;
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break;
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case 2:
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sh->fps = 24.0f;
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break;
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case 3:
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sh->fps = 25.0f;
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break;
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case 4:
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sh->fps = 29.97f;
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break;
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case 5:
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sh->fps = 30.0f;
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break;
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case 6:
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sh->fps = 50.0f;
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break;
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case 7:
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sh->fps = 59.94f;
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break;
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case 8:
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sh->fps = 60.0f;
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break;
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default:
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sh->fps = 25.0f;
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}
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}
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sh->frametime = 1.0f/sh->fps;
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}
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else
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{
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y4m_init_stream_info(priv->si);
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if ((err=y4m_read_stream_header(demuxer->stream, priv->si)) != Y4M_OK)
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mp_msg(MSGT_DEMUXER, MSGL_FATAL, "error parsing YUV4MPEG header: %s\n", y4m_strerr(err));
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if(!sh->fps) {
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ratio = y4m_si_get_framerate(priv->si);
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if (ratio.d != 0)
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sh->fps=(float)ratio.n/(float)ratio.d;
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else
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sh->fps=15.0f;
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}
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sh->frametime=1.0f/sh->fps;
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ratio = y4m_si_get_sampleaspect(priv->si);
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sh->disp_w = y4m_si_get_width(priv->si);
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sh->disp_h = y4m_si_get_height(priv->si);
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if (ratio.d != 0 && ratio.n != 0)
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sh->aspect = (float)(sh->disp_w*ratio.n)/(float)(sh->disp_h*ratio.d);
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demuxer->seekable = 0;
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}
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sh->format = mmioFOURCC('Y', 'V', '1', '2');
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sh->bih=malloc(sizeof(BITMAPINFOHEADER));
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memset(sh->bih,0,sizeof(BITMAPINFOHEADER));
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sh->bih->biSize=40;
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sh->bih->biWidth = sh->disp_w;
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sh->bih->biHeight = sh->disp_h;
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sh->bih->biPlanes=3;
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sh->bih->biBitCount=12;
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sh->bih->biCompression=sh->format;
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sh->bih->biSizeImage=sh->bih->biWidth*sh->bih->biHeight*3/2; /* YV12 */
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demuxer->video->sh=sh;
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sh->ds=demuxer->video;
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demuxer->video->id=0;
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mp_msg(MSGT_DEMUX, MSGL_INFO, "YUV4MPEG2 Video stream %d size: display: %dx%d, codec: %ux%u\n",
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demuxer->video->id, sh->disp_w, sh->disp_h, sh->bih->biWidth,
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sh->bih->biHeight);
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return demuxer;
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}
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static void demux_seek_y4m(demuxer_t *demuxer, float rel_seek_secs, float audio_delay, int flags) {
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sh_video_t* sh = demuxer->video->sh;
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y4m_priv_t* priv = demuxer->priv;
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int rel_seek_frames = sh->fps*rel_seek_secs;
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int size = 3*sh->disp_w*sh->disp_h/2;
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off_t curr_pos = stream_tell(demuxer->stream);
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if (priv->framenum + rel_seek_frames < 0) rel_seek_frames = -priv->framenum;
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//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));
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//printf("framenum=%d, curr_pos=%ld, currpos/(size+6)=%f\n", priv->framenum, curr_pos, (float)curr_pos/(float)(size+6));
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priv->framenum += rel_seek_frames;
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if (priv->is_older) {
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/* Well this is easy: every frame takes up size+6 bytes
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* in the stream and we may assume that the stream pointer
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* is always at the beginning of a frame.
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* framenum is the number of the frame that is about to be
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* demuxed (counting from ONE (see demux_open_y4m)) */
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stream_seek(demuxer->stream, curr_pos + rel_seek_frames*(size+6));
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} else {
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/* should never come here, because seeking for YUV4MPEG2
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* is disabled. */
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mp_msg(MSGT_DEMUX, MSGL_WARN, "Seeking for YUV4MPEG2 not yet implemented!\n");
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}
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}
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static void demux_close_y4m(demuxer_t *demuxer)
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{
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y4m_priv_t* priv = demuxer->priv;
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if(!priv)
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return;
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if (!priv->is_older)
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y4m_fini_stream_info(((y4m_priv_t*)demuxer->priv)->si);
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free(((y4m_priv_t*)demuxer->priv)->si);
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free(demuxer->priv);
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return;
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}
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const demuxer_desc_t demuxer_desc_y4m = {
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"YUV4MPEG2 demuxer",
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"y4m",
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"YUV4MPEG2",
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"Rik snel",
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"",
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DEMUXER_TYPE_Y4M,
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1, // safe autodetect
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y4m_check_file,
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demux_y4m_fill_buffer,
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demux_open_y4m,
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demux_close_y4m,
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demux_seek_y4m,
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NULL
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};
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