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mpv/libmpdemux/demux_avi.c
Uoti Urpala 9bcd12fdf5 Merge svn changes up to r28310 
The libdvdread4 and libdvdnav directories, which are externals in the
svn repository, are at least for now not included in any form. I added
configure checks to automatically disable internal libdvdread and
libdvdnav if the corresponding directories are not present; if they're
added manually then things work the same as in svn.
2009-01-15 05:57:31 +02:00

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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/stream.h"
#include "demuxer.h"
#include "stheader.h"
#include "aviheader.h"
demuxer_t* init_avi_with_ogg(demuxer_t* demuxer);
int demux_ogg_open(demuxer_t* demuxer);
extern const demuxer_desc_t demuxer_desc_avi_ni;
extern const demuxer_desc_t demuxer_desc_avi_nini;
// PTS: 0=interleaved 1=BPS-based
int pts_from_bps=1;
// Select ds from ID
static demux_stream_t* demux_avi_select_stream(demuxer_t *demux,
unsigned int id)
{
int stream_id=avi_stream_id(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;
avi_priv_t *priv=demux->priv;
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){
priv->audio_block_size=sh->wf->nBlockAlign;
if(!priv->audio_block_size){
// for PCM audio we can calculate the blocksize:
if(sh->format==1)
priv->audio_block_size=sh->wf->nChannels*(sh->wf->wBitsPerSample/8);
else
priv->audio_block_size=1; // hope the best...
} else {
// workaround old mencoder's bug:
if(sh->audio.dwSampleSize==1 && sh->audio.dwScale==1 &&
(sh->wf->nBlockAlign==1152 || sh->wf->nBlockAlign==576)){
mp_msg(MSGT_DEMUX,MSGL_WARN,MSGTR_WorkAroundBlockAlignHeaderBug);
priv->audio_block_size=1;
}
}
} else {
priv->audio_block_size=sh->audio.dwSampleSize;
}
}
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){
static const char valid[] = "0123456789abcdefghijklmnopqrstuvwxyz"
"ABCDEFGHIJKLMNOPQRSTUVWXYZ_";
unsigned char* fcc=(unsigned char*)(&id);
return strchr(valid, fcc[0]) && strchr(valid, fcc[1]) &&
strchr(valid, fcc[2]) && strchr(valid, fcc[3]);
}
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;
mp_dbg(MSGT_DEMUX,MSGL_DBG3,"demux_avi.read_packet: %X\n",id);
if(ds==demux->audio){
if(priv->pts_corrected==0){
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;
}
if(pts_from_bps){
pts = priv->audio_block_no *
(float)((sh_audio_t*)demux->audio->sh)->audio.dwScale /
(float)((sh_audio_t*)demux->audio->sh)->audio.dwRate;
} else
pts=priv->avi_audio_pts; //+priv->pts_correction;
priv->avi_audio_pts=0;
// update blockcount:
priv->audio_block_no+=priv->audio_block_size ?
((len+priv->audio_block_size-1)/priv->audio_block_size) : 1;
} else
if(ds==demux->video){
// video
if(priv->skip_video_frames>0){
// drop frame (seeking)
--priv->skip_video_frames;
ds=NULL;
}
pts = priv->avi_video_pts = priv->video_pack_no *
(float)((sh_video_t*)demux->video->sh)->video.dwScale /
(float)((sh_video_t*)demux->video->sh)->video.dwRate;
priv->avi_audio_pts=priv->avi_video_pts+priv->pts_correction;
priv->pts_has_video=1;
if(ds) ++priv->video_pack_no;
}
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;
}
skip = FFMAX(skip, 0);
if (avi_stream_id(id) > 99 && id != mmioFOURCC('J','U','N','K'))
skip = FFMIN(skip, 65536);
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;
}
static uint32_t avi_find_id(stream_t *stream) {
uint32_t id = stream_read_dword_le(stream);
if (!id) {
mp_msg(MSGT_DEMUX, MSGL_WARN, "Incomplete stream? Trying resync.\n");
do {
id = stream_read_dword_le(stream);
if (stream_eof(stream)) return 0;
} while (avi_stream_id(id) > 99);
}
return id;
}
// return value:
// 0 = EOF or no stream found
// 1 = successfully read a packet
static int demux_avi_fill_buffer(demuxer_t *demux, demux_stream_t *dsds){
avi_priv_t *priv=demux->priv;
unsigned int id=0;
unsigned int len;
int ret=0;
demux_stream_t *ds;
do{
int flags=1;
AVIINDEXENTRY *idx=NULL;
if(priv->idx_size>0 && priv->idx_pos<priv->idx_size){
off_t pos;
idx=&((AVIINDEXENTRY *)priv->idx)[priv->idx_pos++];
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 = (off_t)priv->idx_offset+AVI_IDX_OFFSET(idx);
if((pos<demux->movi_start || pos>=demux->movi_end) && (demux->movi_end>demux->movi_start) && (demux->stream->flags & STREAM_SEEK)){
mp_msg(MSGT_DEMUX,MSGL_V,"ChunkOffset out of range! idx=0x%"PRIX64" \n",(int64_t)pos);
continue;
}
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!=idx->dwChunkLength)&&((len+1)!=idx->dwChunkLength)){
mp_msg(MSGT_DEMUX,MSGL_V,"ChunkSize mismatch! raw=%d idx=%d \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=0;
} else {
demux->filepos=stream_tell(demux->stream);
if(demux->filepos>=demux->movi_end && demux->movi_end>demux->movi_start && (demux->stream->flags & STREAM_SEEK)){
demux->stream->eof=1;
return 0;
}
id=avi_find_id(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;
demux->desc=&demuxer_desc_avi_ni;
--priv->idx_pos; // hack
} else {
// no index
demux->type=DEMUXER_TYPE_AVI_NINI;
demux->desc=&demuxer_desc_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);
} while(ret!=1);
return 1;
}
// return value:
// 0 = EOF or no stream found
// 1 = successfully read a packet
static 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 ret=0;
do{
int flags=1;
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];
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+AVI_IDX_OFFSET(idx);
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%"PRIX64" idx=0x%"PRIX64" \n",(int64_t)demux->filepos,(int64_t)pos);
continue;
}
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!=idx->dwChunkLength)&&((len+1)!=idx->dwChunkLength)){
mp_msg(MSGT_DEMUX,MSGL_V,"ChunkSize mismatch! raw=%d idx=%d \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=0;
} else return 0;
ret=demux_avi_read_packet(demux,demux_avi_select_stream(demux,id),id,len,idx_pos,flags);
} while(ret!=1);
return 1;
}
// return value:
// 0 = EOF or no stream found
// 1 = successfully read a packet
static 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)){
ds->eof=1;
return 0;
}
id=avi_find_id(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;
}
// AVI demuxer parameters:
int index_mode=-1; // -1=untouched 0=don't use index 1=use (generate) index
char *index_file_save = NULL, *index_file_load = NULL;
int force_ni=0; // force non-interleaved AVI parsing
void read_avi_header(demuxer_t *demuxer,int index_mode);
static 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;
priv->video_pack_no=0;
priv->audio_block_no=0;
priv->audio_block_size=0;
priv->isodml = 0;
priv->suidx_size = 0;
priv->suidx = NULL;
demuxer->priv=(void*)priv;
//---- AVI header:
read_avi_header(demuxer,(demuxer->stream->flags & STREAM_SEEK_BW)?index_mode:-2);
if(demuxer->audio->id>=0 && !demuxer->a_streams[demuxer->audio->id]){
mp_msg(MSGT_DEMUX,MSGL_WARN,MSGTR_InvalidAudioStreamNosound,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,MSGTR_InvalidAudioStreamUsingDefault,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((AVI_IDX_OFFSET(&((AVIINDEXENTRY *)priv->idx)[0])<demuxer->movi_start ||
AVI_IDX_OFFSET(&((AVIINDEXENTRY *)priv->idx)[1])<demuxer->movi_start )&& !priv->isodml)
priv->idx_offset=demuxer->movi_start-4;
else
priv->idx_offset=0;
#else
if(AVI_IDX_OFFSET(&((AVIINDEXENTRY *)priv->idx)[0])<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);
}
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 + AVI_IDX_OFFSET(idx);
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;
}
if(a_pos==-1){
d_audio->sh=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!!!!
demuxer->desc=&demuxer_desc_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!!!!
demuxer->desc=&demuxer_desc_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);
d_audio->sh=sh_audio=NULL;
} else {
sh_audio=d_audio->sh;sh_audio->ds=d_audio;
}
}
// calculating audio/video bitrate:
if(priv->idx_size>0){
// we have index, let's count 'em!
int64_t vsize=0;
int64_t asize=0;
size_t vsamples=0;
size_t asamples=0;
int i;
for(i=0;i<priv->idx_size;i++){
int id=avi_stream_id(((AVIINDEXENTRY *)priv->idx)[i].ckid);
int len=((AVIINDEXENTRY *)priv->idx)[i].dwChunkLength;
if(sh_video->ds->id == id) {
vsize+=len;
++vsamples;
}
else if(sh_audio && sh_audio->ds->id == id) {
asize+=len;
asamples+=(len+priv->audio_block_size-1)/priv->audio_block_size;
}
}
mp_msg(MSGT_DEMUX,MSGL_V,"AVI video size=%"PRId64" (%u) audio size=%"PRId64" (%u)\n",vsize,vsamples,asize,asamples);
priv->numberofframes=vsamples;
sh_video->i_bps=((float)vsize/(float)vsamples)*(float)sh_video->video.dwRate/(float)sh_video->video.dwScale;
if(sh_audio) sh_audio->i_bps=((float)asize/(float)asamples)*(float)sh_audio->audio.dwRate/(float)sh_audio->audio.dwScale;
} else {
// guessing, results may be inaccurate:
int64_t vsize;
int64_t asize=0;
if((priv->numberofframes=sh_video->video.dwLength)<=1)
// bad video header, try to get number of frames from audio
if(sh_audio && sh_audio->wf->nAvgBytesPerSec) priv->numberofframes=sh_video->fps*sh_audio->audio.dwLength/sh_audio->audio.dwRate*sh_audio->audio.dwScale;
if(priv->numberofframes<=1){
mp_msg(MSGT_SEEK,MSGL_WARN,MSGTR_CouldntDetFNo);
priv->numberofframes=0;
}
if(sh_audio){
if(sh_audio->wf->nAvgBytesPerSec && sh_audio->audio.dwSampleSize!=1){
asize=(float)sh_audio->wf->nAvgBytesPerSec*sh_audio->audio.dwLength*sh_audio->audio.dwScale/sh_audio->audio.dwRate;
} else {
asize=sh_audio->audio.dwLength;
sh_audio->i_bps=(float)asize/(sh_video->frametime*priv->numberofframes);
}
}
vsize=demuxer->movi_end-demuxer->movi_start-asize-8*priv->numberofframes;
mp_msg(MSGT_DEMUX,MSGL_V,"AVI video size=%"PRId64" (%u) audio size=%"PRId64"\n",vsize,priv->numberofframes,asize);
sh_video->i_bps=(float)vsize/(sh_video->frametime*priv->numberofframes);
}
return demuxer;
}
static void demux_seek_avi(demuxer_t *demuxer,float rel_seek_secs,float audio_delay,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&SEEK_ABSOLUTE){
// seek absolute
video_chunk_pos=0;
}
if(flags&SEEK_FACTOR){
rel_seek_frames=rel_seek_secs*priv->numberofframes;
}
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;
}
priv->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;
priv->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
/* immediate seeking to audio position, including when streams are delayed */
curr_audio_pos=(priv->avi_video_pts + audio_delay)*(float)sh_audio->audio.dwRate/(float)sh_audio->audio.dwScale;
curr_audio_pos*=sh_audio->audio.dwSampleSize;
// 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;
if(d_audio->dpos<=curr_audio_pos && curr_audio_pos<(d_audio->dpos+len)){
break;
}
++d_audio->pack_no;
priv->audio_block_no+=priv->audio_block_size ?
((len+priv->audio_block_size-1)/priv->audio_block_size) : 1;
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
/* immediate seeking to audio position, including when streams are delayed */
int chunks=(priv->avi_video_pts + audio_delay)*(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;
priv->audio_block_no+=priv->audio_block_size ?
((len+priv->audio_block_size-1)/priv->audio_block_size) : 1;
d_audio->dpos+=len;
audio_chunk_pos=i;
}
if(priv->audio_block_size)
chunks-=(len+priv->audio_block_size-1)/priv->audio_block_size;
}
}
}
// 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;
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->avi_audio_pts=priv->avi_video_pts;
// set index position:
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_video->pts=priv->avi_video_pts; // OSD
}
static 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);
}
static int demux_avi_control(demuxer_t *demuxer,int cmd, void *arg){
avi_priv_t *priv=demuxer->priv;
demux_stream_t *d_video=demuxer->video;
sh_video_t *sh_video=d_video->sh;
switch(cmd) {
case DEMUXER_CTRL_GET_TIME_LENGTH:
if (!priv->numberofframes || !sh_video) return DEMUXER_CTRL_DONTKNOW;
*((double *)arg)=(double)priv->numberofframes/sh_video->fps;
if (sh_video->video.dwLength<=1) return DEMUXER_CTRL_GUESS;
return DEMUXER_CTRL_OK;
case DEMUXER_CTRL_GET_PERCENT_POS:
if (!priv->numberofframes || !sh_video) {
return DEMUXER_CTRL_DONTKNOW;
}
*((int *)arg)=(int)(priv->video_pack_no*100/priv->numberofframes);
if (sh_video->video.dwLength<=1) return DEMUXER_CTRL_GUESS;
return DEMUXER_CTRL_OK;
case DEMUXER_CTRL_SWITCH_AUDIO:
case DEMUXER_CTRL_SWITCH_VIDEO: {
int audio = (cmd == DEMUXER_CTRL_SWITCH_AUDIO);
demux_stream_t *ds = audio ? demuxer->audio : demuxer->video;
void **streams = audio ? demuxer->a_streams : demuxer->v_streams;
int maxid = FFMIN(100, audio ? MAX_A_STREAMS : MAX_V_STREAMS);
int chunkid;
if (ds->id < -1)
return DEMUXER_CTRL_NOTIMPL;
if (*(int *)arg >= 0)
ds->id = *(int *)arg;
else {
int i;
for (i = 0; i < maxid; i++) {
if (++ds->id >= maxid) ds->id = 0;
if (streams[ds->id]) break;
}
}
chunkid = (ds->id / 10 + '0') | (ds->id % 10 + '0') << 8;
ds->sh = NULL;
if (!streams[ds->id]) // stream not available
ds->id = -1;
else
demux_avi_select_stream(demuxer, chunkid);
*(int *)arg = ds->id;
return DEMUXER_CTRL_OK;
}
default:
return DEMUXER_CTRL_NOTIMPL;
}
}
static int avi_check_file(demuxer_t *demuxer)
{
int id=stream_read_dword_le(demuxer->stream); // "RIFF"
if((id==mmioFOURCC('R','I','F','F')) || (id==mmioFOURCC('O','N','2',' '))) {
stream_read_dword_le(demuxer->stream); //filesize
id=stream_read_dword_le(demuxer->stream); // "AVI "
if(id==formtypeAVI)
return DEMUXER_TYPE_AVI;
// "Samsung Digimax i6 PMP" crap according to bug 742
if(id==mmioFOURCC('A','V','I',0x19))
return DEMUXER_TYPE_AVI;
if(id==mmioFOURCC('O','N','2','f')){
mp_msg(MSGT_DEMUXER,MSGL_INFO,MSGTR_ON2AviFormat);
return DEMUXER_TYPE_AVI;
}
}
return 0;
}
static demuxer_t* demux_open_hack_avi(demuxer_t *demuxer)
{
struct MPOpts *opts = demuxer->opts;
sh_audio_t* sh_a;
demuxer = demux_open_avi(demuxer);
if(!demuxer) return NULL; // failed to open
sh_a = demuxer->audio->sh;
if(demuxer->audio->id != -2 && sh_a) {
#ifdef CONFIG_OGGVORBIS
// support for Ogg-in-AVI:
if(sh_a->format == 0xFFFE)
demuxer = init_avi_with_ogg(demuxer);
else if(sh_a->format == 0x674F) {
stream_t* s;
demuxer_t *od;
s = new_ds_stream(demuxer->audio);
od = new_demuxer(opts, s,DEMUXER_TYPE_OGG,-1,-2,-2,NULL);
if(!demux_ogg_open(od)) {
mp_msg( MSGT_DEMUXER,MSGL_ERR,MSGTR_ErrorOpeningOGGDemuxer);
free_stream(s);
demuxer->audio->id = -2;
} else
demuxer = new_demuxers_demuxer(demuxer,od,demuxer);
}
#endif
}
return demuxer;
}
const demuxer_desc_t demuxer_desc_avi = {
"AVI demuxer",
"avi",
"AVI",
"Arpi?",
"AVI files, including non interleaved files",
DEMUXER_TYPE_AVI,
1, // safe autodetect
avi_check_file,
demux_avi_fill_buffer,
demux_open_hack_avi,
demux_close_avi,
demux_seek_avi,
demux_avi_control
};
const demuxer_desc_t demuxer_desc_avi_ni = {
"AVI demuxer, non-interleaved",
"avini",
"AVI",
"Arpi?",
"AVI files, including non interleaved files",
DEMUXER_TYPE_AVI,
1, // safe autodetect
avi_check_file,
demux_avi_fill_buffer_ni,
demux_open_hack_avi,
demux_close_avi,
demux_seek_avi,
demux_avi_control
};
const demuxer_desc_t demuxer_desc_avi_nini = {
"AVI demuxer, non-interleaved and no index",
"avinini",
"AVI",
"Arpi?",
"AVI files, including non interleaved files",
DEMUXER_TYPE_AVI,
1, // safe autodetect
avi_check_file,
demux_avi_fill_buffer_nini,
demux_open_hack_avi,
demux_close_avi,
demux_seek_avi,
demux_avi_control
};
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