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mpv/libmpdemux/demux_avi.c

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// AVI file parser for DEMUXER v2.9 by A'rpi/ESP-team
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "config.h"
#include "mp_msg.h"
#include "help_mp.h"
#include "stream.h"
#include "demuxer.h"
#include "stheader.h"
#include "aviheader.h"
// Select ds from ID
demux_stream_t* demux_avi_select_stream(demuxer_t *demux,unsigned int id){
int stream_id=avi_stream_id(id);
// printf("demux_avi_select_stream(%d) {a:%d/v:%d}\n",stream_id,
// demux->audio->id,demux->video->id);
if(demux->video->id==-1)
if(demux->v_streams[stream_id])
demux->video->id=stream_id;
if(demux->audio->id==-1)
if(demux->a_streams[stream_id])
demux->audio->id=stream_id;
if(stream_id==demux->audio->id){
if(!demux->audio->sh){
sh_audio_t* sh;
sh=demux->audio->sh=demux->a_streams[stream_id];
mp_msg(MSGT_DEMUX,MSGL_V,"Auto-selected AVI audio ID = %d\n",demux->audio->id);
if(sh->wf){
demux->audio->block_size=sh->wf->nBlockAlign;
if(!demux->audio->block_size){
// for PCM audio we can calculate the blocksize:
if(sh->format==1) demux->audio->block_size=sh->wf->nChannels*(sh->wf->wBitsPerSample/8);
if(!demux->audio->block_size) demux->audio->block_size=1; // bug!
}
}
//printf("&&&&& setting blocksize to %d &&&&&\n",demux->audio->block_size);
}
return demux->audio;
}
if(stream_id==demux->video->id){
if(!demux->video->sh){
demux->video->sh=demux->v_streams[stream_id];
mp_msg(MSGT_DEMUX,MSGL_V,"Auto-selected AVI video ID = %d\n",demux->video->id);
}
return demux->video;
}
if(id!=mmioFOURCC('J','U','N','K')){
// unknown
mp_msg(MSGT_DEMUX,MSGL_DBG2,"Unknown chunk: %.4s (%X)\n",(char *) &id,id);
//abort();
}
return NULL;
}
static int valid_fourcc(unsigned int id){
unsigned char* fcc=(unsigned char*)(&id);
#define FCC_CHR_CHECK(x) (x<48 || x>=96)
if(FCC_CHR_CHECK(fcc[0])) return 0;
if(FCC_CHR_CHECK(fcc[1])) return 0;
if(FCC_CHR_CHECK(fcc[2])) return 0;
if(FCC_CHR_CHECK(fcc[3])) return 0;
return 1;
#undef FCC_CHR_CHECK
}
static int choose_chunk_len(unsigned int len1,unsigned int len2){
// len1 has a bit more priority than len2. len1!=len2
// Note: this is a first-idea-logic, may be wrong. comments welcomed.
// prefer small frames rather than 0
if(!len1) return (len2>0x80000) ? len1 : len2;
if(!len2) return (len1>0x100000) ? len2 : len1;
// choose the smaller value:
return (len1<len2)? len1 : len2;
}
static int demux_avi_read_packet(demuxer_t *demux,demux_stream_t *ds,unsigned int id,unsigned int len,int idxpos,int flags){
avi_priv_t *priv=demux->priv;
int skip;
float pts=0;
// demux_stream_t *ds=demux_avi_select_stream(demux,id);
mp_dbg(MSGT_DEMUX,MSGL_DBG3,"demux_avi.read_packet: %X\n",id);
if(ds==demux->audio){
if(priv->pts_corrected==0){
// printf("\rYYY-A A: %5.3f V: %5.3f \n",priv->avi_audio_pts,priv->avi_video_pts);
if(priv->pts_has_video){
// we have video pts now
float delay=0;
if(((sh_audio_t*)(ds->sh))->wf->nAvgBytesPerSec)
delay=(float)priv->pts_corr_bytes/((sh_audio_t*)(ds->sh))->wf->nAvgBytesPerSec;
mp_msg(MSGT_DEMUX,MSGL_V,"XXX initial v_pts=%5.3f a_pos=%d (%5.3f) \n",priv->avi_audio_pts,priv->pts_corr_bytes,delay);
//priv->pts_correction=-priv->avi_audio_pts+delay;
priv->pts_correction=delay-priv->avi_audio_pts;
priv->avi_audio_pts+=priv->pts_correction;
priv->pts_corrected=1;
} else
priv->pts_corr_bytes+=len;
}
pts=priv->avi_audio_pts; //+priv->pts_correction;
priv->avi_audio_pts=0;
} else
if(ds==demux->video){
// video
if(priv->skip_video_frames>0){
// drop frame (seeking)
--priv->skip_video_frames;
ds=NULL;
// } else {
// pts=priv->avi_video_pts;
}
// ezt a 2 sort lehet hogy fell kell majd cserelni:
//priv->avi_video_pts+=avi_pts_frametime;
//priv->avi_video_pts+=(float)avi_header.video.dwScale/(float)avi_header.video.dwRate;
//priv->avi_video_pts+=((sh_video_t*)ds->sh)->frametime;
// FIXME!!!
#if 1
// printf("ds=0x%X\n",ds);
// printf("packno=%d\n",ds->pack_no);
// printf("### pack_no=%d\n",demux->video->pack_no+demux->video->packs);
priv->avi_video_pts = (demux->video->pack_no+demux->video->packs) *
(float)((sh_video_t*)demux->video->sh)->video.dwScale /
(float)((sh_video_t*)demux->video->sh)->video.dwRate;
#else
priv->avi_video_pts+=(float)((sh_video_t*)(demux->video->sh))->video.dwScale/(float)((sh_video_t*)(demux->video->sh))->video.dwRate;
// priv->avi_video_pts+=avi_video_ftime;
#endif
// printf("\rYYY-V A: %5.3f V: %5.3f \n",priv->avi_audio_pts,priv->avi_video_pts);
priv->avi_audio_pts=priv->avi_video_pts+priv->pts_correction;
priv->pts_has_video=1;
pts=priv->avi_video_pts;
//printf("read pack_no: %d pts %5.3f \n",demux->video->pack_no+demux->video->packs,pts);
}
// len=stream_read_dword_le(demux->stream);
skip=(len+1)&(~1); // total bytes in this chunk
if(ds){
mp_dbg(MSGT_DEMUX,MSGL_DBG2,"DEMUX_AVI: Read %d data bytes from packet %04X\n",len,id);
ds_read_packet(ds,demux->stream,len,pts,idxpos,flags);
skip-=len;
}
if(skip){
mp_dbg(MSGT_DEMUX,MSGL_DBG2,"DEMUX_AVI: Skipping %d bytes from packet %04X\n",skip,id);
stream_skip(demux->stream,skip);
}
return ds?1:0;
}
// return value:
// 0 = EOF or no stream found
// 1 = successfully read a packet
int demux_avi_fill_buffer(demuxer_t *demux){
avi_priv_t *priv=demux->priv;
unsigned int id=0;
unsigned int len;
//int max_packs=128;
int ret=0;
demux_stream_t *ds;
do{
int flags=0;
AVIINDEXENTRY *idx=NULL;
#if 0
demux->filepos=stream_tell(demux->stream);
if(demux->filepos>=demux->movi_end){
demux->stream->eof=1;
return 0;
}
if(stream_eof(demux->stream)) return 0;
#endif
if(priv->idx_size>0 && priv->idx_pos<priv->idx_size){
off_t pos;
//if(priv->idx_pos<0) printf("Fatal! idx_pos=%d\n",priv->idx_pos);
idx=&((AVIINDEXENTRY *)priv->idx)[priv->idx_pos++];
//printf("[%d]",priv->idx_pos);fflush(stdout);
//stream_seek(demux->stream,idx.dwChunkOffset);
//printf("IDX pos=%X idx.pos=%X idx.size=%X idx.flags=%X\n",demux->filepos,
// pos-4,idx->dwChunkLength,idx->dwFlags);
if(idx->dwFlags&AVIIF_LIST){
// LIST
continue;
}
if(!demux_avi_select_stream(demux,idx->ckid)){
mp_dbg(MSGT_DEMUX,MSGL_DBG3,"Skip chunk %.4s (0x%X) \n",(char *)&idx->ckid,(unsigned int)idx->ckid);
continue; // skip this chunk
}
pos = priv->idx_offset + (unsigned long)idx->dwChunkOffset;
if((pos<demux->movi_start || pos>=demux->movi_end) && (demux->movi_end>demux->movi_start)){
mp_msg(MSGT_DEMUX,MSGL_V,"ChunkOffset out of range! idx=0x%X \n",pos);
continue;
}
#if 0
if(pos!=demux->filepos){
mp_msg(MSGT_DEMUX,MSGL_V,"Warning! pos=0x%X idx.pos=0x%X diff=%d \n",demux->filepos,pos,pos-demux->filepos);
}
#endif
stream_seek(demux->stream,pos);
demux->filepos=stream_tell(demux->stream);
id=stream_read_dword_le(demux->stream);
if(stream_eof(demux->stream)) return 0; // EOF!
if(id!=idx->ckid){
mp_msg(MSGT_DEMUX,MSGL_V,"ChunkID mismatch! raw=%.4s idx=%.4s \n",(char *)&id,(char *)&idx->ckid);
if(valid_fourcc(idx->ckid))
id=idx->ckid; // use index if valid
else
if(!valid_fourcc(id)) continue; // drop chunk if both id and idx bad
}
len=stream_read_dword_le(demux->stream);
// if((len&(~1))!=(idx->dwChunkLength&(~1))){
// if((len)!=(idx->dwChunkLength)){
if((len!=idx->dwChunkLength)&&((len+1)!=idx->dwChunkLength)){
mp_msg(MSGT_DEMUX,MSGL_V,"ChunkSize mismatch! raw=%d idx=%ld \n",len,idx->dwChunkLength);
if(len>0x200000 && idx->dwChunkLength>0x200000) continue; // both values bad :(
len=choose_chunk_len(idx->dwChunkLength,len);
}
if(idx->dwFlags&AVIIF_KEYFRAME) flags=1;
} else {
demux->filepos=stream_tell(demux->stream);
if(demux->filepos>=demux->movi_end && demux->movi_end>demux->movi_start){
demux->stream->eof=1;
return 0;
}
id=stream_read_dword_le(demux->stream);
len=stream_read_dword_le(demux->stream);
if(stream_eof(demux->stream)) return 0; // EOF!
if(id==mmioFOURCC('L','I','S','T') || id==mmioFOURCC('R', 'I', 'F', 'F')){
id=stream_read_dword_le(demux->stream); // list or RIFF type
continue;
}
}
ds=demux_avi_select_stream(demux,id);
if(ds)
if(ds->packs+1>=MAX_PACKS || ds->bytes+len>=MAX_PACK_BYTES){
// this packet will cause a buffer overflow, switch to -ni mode!!!
mp_msg(MSGT_DEMUX,MSGL_WARN,MSGTR_SwitchToNi);
if(priv->idx_size>0){
// has index
demux->type=DEMUXER_TYPE_AVI_NI;
--priv->idx_pos; // hack
} else {
// no index
demux->type=DEMUXER_TYPE_AVI_NINI;
priv->idx_pos=demux->filepos; // hack
}
priv->idx_pos_v=priv->idx_pos_a=priv->idx_pos;
// quit now, we can't even (no enough buffer memory) read this packet :(
return -1;
}
ret=demux_avi_read_packet(demux,ds,id,len,priv->idx_pos-1,flags);
// if(!ret && priv->skip_video_frames<=0)
// if(--max_packs==0){
// demux->stream->eof=1;
// mp_msg(MSGT_DEMUX,MSGL_ERR,MSGTR_DoesntContainSelectedStream);
// return 0;
// }
} while(ret!=1);
return 1;
}
// return value:
// 0 = EOF or no stream found
// 1 = successfully read a packet
int demux_avi_fill_buffer_ni(demuxer_t *demux,demux_stream_t* ds){
avi_priv_t *priv=demux->priv;
unsigned int id=0;
unsigned int len;
//int max_packs=128;
int ret=0;
do{
int flags=0;
AVIINDEXENTRY *idx=NULL;
int idx_pos=0;
demux->filepos=stream_tell(demux->stream);
if(ds==demux->video) idx_pos=priv->idx_pos_v++; else
if(ds==demux->audio) idx_pos=priv->idx_pos_a++; else
idx_pos=priv->idx_pos++;
if(priv->idx_size>0 && idx_pos<priv->idx_size){
off_t pos;
idx=&((AVIINDEXENTRY *)priv->idx)[idx_pos];
// idx=&priv->idx[idx_pos];
if(idx->dwFlags&AVIIF_LIST){
// LIST
continue;
}
if(ds && demux_avi_select_stream(demux,idx->ckid)!=ds){
mp_dbg(MSGT_DEMUX,MSGL_DBG3,"Skip chunk %.4s (0x%X) \n",(char *)&idx->ckid,(unsigned int)idx->ckid);
continue; // skip this chunk
}
pos = priv->idx_offset+(unsigned long)idx->dwChunkOffset;
if((pos<demux->movi_start || pos>=demux->movi_end) && (demux->movi_end>demux->movi_start)){
mp_msg(MSGT_DEMUX,MSGL_V,"ChunkOffset out of range! current=0x%X idx=0x%X \n",demux->filepos,pos);
continue;
}
#if 0
if(pos!=demux->filepos){
mp_msg(MSGT_DEMUX,MSGL_V,"Warning! pos=0x%X idx.pos=0x%X diff=%d \n",demux->filepos,pos,pos-demux->filepos);
}
#endif
stream_seek(demux->stream,pos);
id=stream_read_dword_le(demux->stream);
if(stream_eof(demux->stream)) return 0;
if(id!=idx->ckid){
mp_msg(MSGT_DEMUX,MSGL_V,"ChunkID mismatch! raw=%.4s idx=%.4s \n",(char *)&id,(char *)&idx->ckid);
if(valid_fourcc(idx->ckid))
id=idx->ckid; // use index if valid
else
if(!valid_fourcc(id)) continue; // drop chunk if both id and idx bad
}
len=stream_read_dword_le(demux->stream);
// if((len&(~1))!=(idx->dwChunkLength&(~1))){
// if((len)!=(idx->dwChunkLength)){
if((len!=idx->dwChunkLength)&&((len+1)!=idx->dwChunkLength)){
mp_msg(MSGT_DEMUX,MSGL_V,"ChunkSize mismatch! raw=%d idx=%ld \n",len,idx->dwChunkLength);
if(len>0x200000 && idx->dwChunkLength>0x200000) continue; // both values bad :(
len=choose_chunk_len(idx->dwChunkLength,len);
}
if(idx->dwFlags&AVIIF_KEYFRAME) flags=1;
} else return 0;
ret=demux_avi_read_packet(demux,demux_avi_select_stream(demux,id),id,len,idx_pos,flags);
// if(!ret && priv->skip_video_frames<=0)
// if(--max_packs==0){
// demux->stream->eof=1;
// mp_msg(MSGT_DEMUX,MSGL_ERR,MSGTR_DoesntContainSelectedStream);
// return 0;
// }
} while(ret!=1);
return 1;
}
// return value:
// 0 = EOF or no stream found
// 1 = successfully read a packet
int demux_avi_fill_buffer_nini(demuxer_t *demux,demux_stream_t* ds){
avi_priv_t *priv=demux->priv;
unsigned int id=0;
unsigned int len;
int ret=0;
off_t *fpos=NULL;
if(ds==demux->video) fpos=&priv->idx_pos_v; else
if(ds==demux->audio) fpos=&priv->idx_pos_a; else
return 0;
stream_seek(demux->stream,fpos[0]);
do{
demux->filepos=stream_tell(demux->stream);
if(demux->filepos>=demux->movi_end && (demux->movi_end>demux->movi_start)){
//demux->stream->eof=1;
ds->eof=1;
return 0;
}
id=stream_read_dword_le(demux->stream);
len=stream_read_dword_le(demux->stream);
if(stream_eof(demux->stream)) return 0;
if(id==mmioFOURCC('L','I','S','T')){
id=stream_read_dword_le(demux->stream); // list type
continue;
}
if(id==mmioFOURCC('R','I','F','F')){
mp_msg(MSGT_DEMUX,MSGL_V,"additional RIFF header...\n");
id=stream_read_dword_le(demux->stream); // "AVIX"
continue;
}
if(ds==demux_avi_select_stream(demux,id)){
// read it!
ret=demux_avi_read_packet(demux,ds,id,len,priv->idx_pos-1,0);
} else {
// skip it!
int skip=(len+1)&(~1); // total bytes in this chunk
stream_skip(demux->stream,skip);
}
} while(ret!=1);
fpos[0]=stream_tell(demux->stream);
return 1;
}
//extern int audio_id;
//extern int video_id;
//extern int index_mode; // -1=untouched 0=don't use index 1=use (geneate) index
//extern int force_ni;
//extern int pts_from_bps;
// AVI demuxer parameters:
int index_mode=-1; // -1=untouched 0=don't use index 1=use (geneate) index
int force_ni=0; // force non-interleaved AVI parsing
// PTS: 0=interleaved 1=BPS-based
#ifdef AVI_SYNC_BPS
int pts_from_bps=1;
#else
int pts_from_bps=0;
#endif
void read_avi_header(demuxer_t *demuxer,int index_mode);
demuxer_t* demux_open_avi(demuxer_t* demuxer){
demux_stream_t *d_audio=demuxer->audio;
demux_stream_t *d_video=demuxer->video;
sh_audio_t *sh_audio=NULL;
sh_video_t *sh_video=NULL;
avi_priv_t* priv=malloc(sizeof(avi_priv_t));
// priv struct:
priv->avi_audio_pts=priv->avi_video_pts=0.0f;
priv->pts_correction=0.0f;
priv->skip_video_frames=0;
priv->pts_corr_bytes=0;
priv->pts_has_video=priv->pts_corrected=0;
demuxer->priv=(void*)priv;
//---- AVI header:
read_avi_header(demuxer,(demuxer->stream->type!=STREAMTYPE_STREAM)?index_mode:-2);
if(demuxer->audio->id>=0 && !demuxer->a_streams[demuxer->audio->id]){
mp_msg(MSGT_DEMUX,MSGL_WARN,"AVI: invalid audio stream ID: %d - ignoring (nosound)\n",demuxer->audio->id);
demuxer->audio->id=-2; // disabled
}
if(demuxer->video->id>=0 && !demuxer->v_streams[demuxer->video->id]){
mp_msg(MSGT_DEMUX,MSGL_WARN,"AVI: invalid video stream ID: %d - ignoring (using default)\n",demuxer->video->id);
demuxer->video->id=-1; // autodetect
}
stream_reset(demuxer->stream);
stream_seek(demuxer->stream,demuxer->movi_start);
priv->idx_pos=0;
priv->idx_pos_a=0;
priv->idx_pos_v=0;
if(priv->idx_size>1){
// decide index format:
#if 1
if((unsigned long)((AVIINDEXENTRY *)priv->idx)[0].dwChunkOffset<demuxer->movi_start ||
(unsigned long)((AVIINDEXENTRY *)priv->idx)[1].dwChunkOffset<demuxer->movi_start)
priv->idx_offset=demuxer->movi_start-4;
else
priv->idx_offset=0;
#else
if((unsigned long)((AVIINDEXENTRY *)priv->idx)[0].dwChunkOffset<demuxer->movi_start)
priv->idx_offset=demuxer->movi_start-4;
else
priv->idx_offset=0;
#endif
mp_msg(MSGT_DEMUX,MSGL_V,"AVI index offset: 0x%X (movi=0x%X idx0=0x%X idx1=0x%X)\n",
(int)priv->idx_offset,(int)demuxer->movi_start,
(int)((AVIINDEXENTRY *)priv->idx)[0].dwChunkOffset,
(int)((AVIINDEXENTRY *)priv->idx)[1].dwChunkOffset);
}
// demuxer->endpos=avi_header.movi_end;
if(priv->idx_size>0){
// check that file is non-interleaved:
int i;
off_t a_pos=-1;
off_t v_pos=-1;
for(i=0;i<priv->idx_size;i++){
AVIINDEXENTRY* idx=&((AVIINDEXENTRY *)priv->idx)[i];
demux_stream_t* ds=demux_avi_select_stream(demuxer,idx->ckid);
off_t pos = priv->idx_offset + (unsigned long)idx->dwChunkOffset;
if(a_pos==-1 && ds==demuxer->audio){
a_pos=pos;
if(v_pos!=-1) break;
}
if(v_pos==-1 && ds==demuxer->video){
v_pos=pos;
if(a_pos!=-1) break;
}
}
if(v_pos==-1){
mp_msg(MSGT_DEMUX,MSGL_ERR,"AVI_NI: " MSGTR_MissingVideoStream);
return NULL;
// GUI_MSG( mplErrorAVINI )
}
if(a_pos==-1){
mp_msg(MSGT_DEMUX,MSGL_INFO,"AVI_NI: " MSGTR_MissingAudioStream);
sh_audio=NULL;
} else {
if(force_ni || abs(a_pos-v_pos)>0x100000){ // distance > 1MB
mp_msg(MSGT_DEMUX,MSGL_INFO,MSGTR_NI_Message,force_ni?MSGTR_NI_Forced:MSGTR_NI_Detected);
demuxer->type=DEMUXER_TYPE_AVI_NI; // HACK!!!!
pts_from_bps=1; // force BPS sync!
}
}
} else {
// no index
if(force_ni){
mp_msg(MSGT_DEMUX,MSGL_INFO,MSGTR_UsingNINI);
demuxer->type=DEMUXER_TYPE_AVI_NINI; // HACK!!!!
priv->idx_pos_a=
priv->idx_pos_v=demuxer->movi_start;
pts_from_bps=1; // force BPS sync!
}
demuxer->seekable=0;
}
if(!ds_fill_buffer(d_video)){
mp_msg(MSGT_DEMUX,MSGL_ERR,"AVI: " MSGTR_MissingVideoStreamBug);
return NULL;
}
sh_video=d_video->sh;sh_video->ds=d_video;
if(d_audio->id!=-2){
mp_msg(MSGT_DEMUX,MSGL_V,"AVI: Searching for audio stream (id:%d)\n",d_audio->id);
if(!priv->audio_streams || !ds_fill_buffer(d_audio)){
mp_msg(MSGT_DEMUX,MSGL_INFO,"AVI: " MSGTR_MissingAudioStream);
sh_audio=NULL;
} else {
sh_audio=d_audio->sh;sh_audio->ds=d_audio;
sh_audio->format=sh_audio->wf->wFormatTag;
}
}
// calc. FPS:
sh_video->fps=(float)sh_video->video.dwRate/(float)sh_video->video.dwScale;
sh_video->frametime=(float)sh_video->video.dwScale/(float)sh_video->video.dwRate;
// calculating video bitrate:
sh_video->i_bps=demuxer->movi_end-demuxer->movi_start-priv->idx_size*8;
if(sh_audio) sh_video->i_bps-=sh_audio->audio.dwLength;
mp_msg(MSGT_DEMUX,MSGL_V,"AVI video length=%lu\n",(unsigned long)sh_video->i_bps);
sh_video->i_bps=((float)sh_video->i_bps/(float)sh_video->video.dwLength)*sh_video->fps;
mp_msg(MSGT_DEMUX,MSGL_INFO,"VIDEO: [%.4s] %ldx%ld %dbpp %4.2f fps %5.1f kbps (%4.1f kbyte/s)\n",
(char *)&sh_video->bih->biCompression,
sh_video->bih->biWidth,
sh_video->bih->biHeight,
sh_video->bih->biBitCount,
sh_video->fps,
sh_video->i_bps*0.008f,
sh_video->i_bps/1024.0f );
return demuxer;
}
//extern float initial_pts_delay;
void demux_seek_avi(demuxer_t *demuxer,float rel_seek_secs,int flags){
avi_priv_t *priv=demuxer->priv;
demux_stream_t *d_audio=demuxer->audio;
demux_stream_t *d_video=demuxer->video;
sh_audio_t *sh_audio=d_audio->sh;
sh_video_t *sh_video=d_video->sh;
float skip_audio_secs=0;
//FIXME: OFF_T - Didn't check AVI case yet (avi files can't be >2G anyway?)
//================= seek in AVI ==========================
int rel_seek_frames=rel_seek_secs*sh_video->fps;
int video_chunk_pos=d_video->pos;
int i;
if(flags&1){
// seek absolute
video_chunk_pos=0;
}
if(flags&2){
// float 0..1
int total=sh_video->video.dwLength;
if(total<=1){
// bad video header, try to get it from audio
if(sh_audio) total=sh_video->fps*sh_audio->audio.dwLength/sh_audio->wf->nAvgBytesPerSec;
if(total<=1){
mp_msg(MSGT_SEEK,MSGL_WARN,MSGTR_CouldntDetFNo);
total=0;
}
}
rel_seek_frames=rel_seek_secs*total;
}
priv->skip_video_frames=0;
priv->avi_audio_pts=0;
// ------------ STEP 1: find nearest video keyframe chunk ------------
// find nearest video keyframe chunk pos:
if(rel_seek_frames>0){
// seek forward
while(video_chunk_pos<priv->idx_size-1){
int id=((AVIINDEXENTRY *)priv->idx)[video_chunk_pos].ckid;
if(avi_stream_id(id)==d_video->id){ // video frame
if((--rel_seek_frames)<0 && ((AVIINDEXENTRY *)priv->idx)[video_chunk_pos].dwFlags&AVIIF_KEYFRAME) break;
}
++video_chunk_pos;
}
} else {
// seek backward
while(video_chunk_pos>0){
int id=((AVIINDEXENTRY *)priv->idx)[video_chunk_pos].ckid;
if(avi_stream_id(id)==d_video->id){ // video frame
if((++rel_seek_frames)>0 && ((AVIINDEXENTRY *)priv->idx)[video_chunk_pos].dwFlags&AVIIF_KEYFRAME) break;
}
--video_chunk_pos;
}
}
priv->idx_pos_a=priv->idx_pos_v=priv->idx_pos=video_chunk_pos;
// re-calc video pts:
d_video->pack_no=0;
for(i=0;i<video_chunk_pos;i++){
int id=((AVIINDEXENTRY *)priv->idx)[i].ckid;
if(avi_stream_id(id)==d_video->id) ++d_video->pack_no;
}
sh_video->num_frames=sh_video->num_frames_decoded=d_video->pack_no;
priv->avi_video_pts=d_video->pack_no*(float)sh_video->video.dwScale/(float)sh_video->video.dwRate;
d_video->pos=video_chunk_pos;
mp_msg(MSGT_SEEK,MSGL_DBG2,"V_SEEK: pack=%d pts=%5.3f chunk=%d \n",d_video->pack_no,priv->avi_video_pts,video_chunk_pos);
// ------------ STEP 2: seek audio, find the right chunk & pos ------------
d_audio->pack_no=0;
d_audio->block_no=0;
d_audio->dpos=0;
if(sh_audio){
int i;
int len=0;
int skip_audio_bytes=0;
int curr_audio_pos=-1;
int audio_chunk_pos=-1;
int chunk_max=(demuxer->type==DEMUXER_TYPE_AVI)?video_chunk_pos:priv->idx_size;
if(sh_audio->audio.dwSampleSize){
// constant rate audio stream
#if 0
int align;
curr_audio_pos=(priv->avi_video_pts) * sh_audio->wf->nAvgBytesPerSec;
if(curr_audio_pos<0)curr_audio_pos=0;
align=sh_audio->audio.dwSampleSize;
if(sh_audio->wf->nBlockAlign>align) align=sh_audio->wf->nBlockAlign;
curr_audio_pos/=align;
curr_audio_pos*=align;
#else
curr_audio_pos=(priv->avi_video_pts)*(float)sh_audio->audio.dwRate/(float)sh_audio->audio.dwScale;
curr_audio_pos-=sh_audio->audio.dwStart;
curr_audio_pos*=sh_audio->audio.dwSampleSize;
#endif
// find audio chunk pos:
for(i=0;i<chunk_max;i++){
int id=((AVIINDEXENTRY *)priv->idx)[i].ckid;
if(avi_stream_id(id)==d_audio->id){
len=((AVIINDEXENTRY *)priv->idx)[i].dwChunkLength;
++d_audio->pack_no;
d_audio->block_no+=(len+d_audio->block_size-1)/d_audio->block_size;
if(d_audio->dpos<=curr_audio_pos && curr_audio_pos<(d_audio->dpos+len)){
break;
}
d_audio->dpos+=len;
}
}
audio_chunk_pos=i;
skip_audio_bytes=curr_audio_pos-d_audio->dpos;
mp_msg(MSGT_SEEK,MSGL_V,"SEEK: i=%d (max:%d) dpos=%d (wanted:%d) \n",
i,chunk_max,(int)d_audio->dpos,curr_audio_pos);
} else {
// VBR audio
int chunks=(priv->avi_video_pts)*(float)sh_audio->audio.dwRate/(float)sh_audio->audio.dwScale;
audio_chunk_pos=0;
// find audio chunk pos:
for(i=0;i<priv->idx_size && chunks>0;i++){
int id=((AVIINDEXENTRY *)priv->idx)[i].ckid;
if(avi_stream_id(id)==d_audio->id){
len=((AVIINDEXENTRY *)priv->idx)[i].dwChunkLength;
if(i>chunk_max){
skip_audio_bytes+=len;
} else {
++d_audio->pack_no;
d_audio->block_no+=(len+d_audio->block_size-1)/d_audio->block_size;
d_audio->dpos+=len;
audio_chunk_pos=i;
}
// --chunks;
chunks-=(len+d_audio->block_size-1)/d_audio->block_size;
}
}
//if(audio_chunk_pos>chunk_max) audio_chunk_pos=chunk_max;
// printf("VBR seek: %5.3f -> chunk_no %d -> chunk_idx %d + skip %d \n",
// priv->avi_video_pts, audio_chunk_pos, );
}
// Now we have:
// audio_chunk_pos = chunk no in index table (it's <=chunk_max)
// skip_audio_bytes = bytes to be skipped after chunk seek
// d-audio->pack_no = chunk_no in stream at audio_chunk_pos
// d_audio->dpos = bytepos in stream at audio_chunk_pos
// let's seek!
// update stream position:
d_audio->pos=audio_chunk_pos;
// d_audio->dpos=apos;
// d_audio->pts=initial_pts_delay+(float)apos/(float)sh_audio->wf->nAvgBytesPerSec;
if(demuxer->type==DEMUXER_TYPE_AVI){
// interleaved stream:
if(audio_chunk_pos<video_chunk_pos){
// calc priv->skip_video_frames & adjust video pts counter:
for(i=audio_chunk_pos;i<video_chunk_pos;i++){
int id=((AVIINDEXENTRY *)priv->idx)[i].ckid;
if(avi_stream_id(id)==d_video->id) ++priv->skip_video_frames;
}
// requires for correct audio pts calculation (demuxer):
priv->avi_video_pts-=priv->skip_video_frames*(float)sh_video->video.dwScale/(float)sh_video->video.dwRate;
priv->idx_pos_a=priv->idx_pos_v=priv->idx_pos=audio_chunk_pos;
}
} else {
// non-interleaved stream:
priv->idx_pos_a=audio_chunk_pos;
priv->idx_pos_v=video_chunk_pos;
priv->idx_pos=(audio_chunk_pos<video_chunk_pos)?audio_chunk_pos:video_chunk_pos;
}
mp_msg(MSGT_SEEK,MSGL_V,"SEEK: idx=%d (a:%d v:%d) v.skip=%d a.skip=%d/%4.3f \n",
(int)priv->idx_pos,audio_chunk_pos,video_chunk_pos,
(int)priv->skip_video_frames,skip_audio_bytes,skip_audio_secs);
if(skip_audio_bytes){
demux_read_data(d_audio,NULL,skip_audio_bytes);
//d_audio->pts=0; // PTS is outdated because of the raw data skipping
}
resync_audio_stream(sh_audio);
// sh_audio->timer=-skip_audio_secs;
}
d_video->pts=priv->avi_video_pts; // OSD
}
void demux_close_avi(demuxer_t *demuxer) {
avi_priv_t* priv=demuxer->priv;
if(!priv)
return;
if(priv->idx_size > 0)
free(priv->idx);
free(priv);
}
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