mpv/demuxer.c

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//=================== DEMUXER v2.5 =========================
#define MAX_PACKS 2048
#define MAX_PACK_BYTES 0x400000
typedef struct demux_packet_st {
int len;
float pts;
int pos; // pozicio indexben (AVI) ill. fileban (MPG)
unsigned char* buffer;
struct demux_packet_st* next;
} demux_packet_t;
inline demux_packet_t* new_demux_packet(int len){
demux_packet_t* dp=malloc(sizeof(demux_packet_t));
dp->len=len;
dp->buffer=malloc(len);
dp->next=NULL;
dp->pts=0;
dp->pos=0;
return dp;
}
inline void free_demux_packet(demux_packet_t* dp){
free(dp->buffer);
free(dp);
}
typedef struct {
int buffer_pos; // current buffer position
int buffer_size; // current buffer size
unsigned char* buffer; // current buffer
float pts; // current buffer's pts
int eof; // end of demuxed stream? (true if all buffer empty)
int pos; // position in the input stream (file)
int dpos; // position in the demuxed stream
//---------------
int packs; // number of packets in buffer
int bytes; // total bytes of packets in buffer
demux_packet_t *first; // read to current buffer from here
demux_packet_t *last; // append new packets from input stream to here
int id; // stream ID (for multiple audio/video streams)
int type; // stream type (currently used only for audio)
struct demuxer_st *demuxer; // parent demuxer structure (stream handler)
// ---- asf -----
demux_packet_t *asf_packet; // read asf fragments here
int asf_seq;
} demux_stream_t;
demux_stream_t* new_demuxer_stream(struct demuxer_st *demuxer,int id){
demux_stream_t* ds=malloc(sizeof(demux_stream_t));
ds->buffer_pos=ds->buffer_size=0;
ds->buffer=NULL;
ds->pts=0;
ds->eof=0;
ds->pos=0;
ds->dpos=0;
//---------------
ds->packs=0;
ds->bytes=0;
ds->first=ds->last=NULL;
ds->id=id;
ds->type=-1;
ds->demuxer=demuxer;
//----------------
ds->asf_seq=-1;
ds->asf_packet=NULL;
return ds;
}
#define DEMUXER_TYPE_UNKNOWN 0
#define DEMUXER_TYPE_MPEG_ES 1
#define DEMUXER_TYPE_MPEG_PS 2
#define DEMUXER_TYPE_AVI 3
#define DEMUXER_TYPE_AVI_NI 4
#define DEMUXER_TYPE_AVI_NINI 5
#define DEMUXER_TYPE_ASF 6
#define DEMUXER_TIME_NONE 0
#define DEMUXER_TIME_PTS 1
#define DEMUXER_TIME_FILE 2
#define DEMUXER_TIME_BPS 3
typedef struct demuxer_st {
stream_t *stream;
int synced; // stream synced (used by mpeg)
int filepos; // input stream current pos.
int endpos; // input stream end pos. (return EOF fi filepos>endpos)
int type; // mpeg system stream, mpeg elementary s., avi raw, avi indexed
// int time_src;// time source (pts/file/bps)
demux_stream_t *audio;
demux_stream_t *video;
} demuxer_t;
demuxer_t* new_demuxer(stream_t *stream,int type,int a_id,int v_id){
demuxer_t *d=malloc(sizeof(demuxer_t));
d->stream=stream;
d->synced=0;
d->filepos=0;
d->audio=new_demuxer_stream(d,a_id);
d->video=new_demuxer_stream(d,v_id);
d->type=type;
return d;
}
static void ds_add_packet(demux_stream_t *ds,demux_packet_t* dp){
// demux_packet_t* dp=new_demux_packet(len);
// stream_read(stream,dp->buffer,len);
// dp->pts=pts; //(float)pts/90000.0f;
// dp->pos=pos;
// append packet to DS stream:
++ds->packs;
ds->bytes+=dp->len;
if(ds->last){
// next packet in stream
ds->last->next=dp;
ds->last=dp;
} else {
// first packet in stream
ds->first=ds->last=dp;
}
if(verbose>=2)
printf("DEMUX: Append packet to %s, len=%d pts=%5.3f pos=%d [packs: A=%d V=%d]\n",
(ds==ds->demuxer->audio)?"d_audio":"d_video",
dp->len,dp->pts,dp->pos,ds->demuxer->audio->packs,ds->demuxer->video->packs);
}
static void ds_read_packet(demux_stream_t *ds,stream_t *stream,int len,float pts,int pos){
demux_packet_t* dp=new_demux_packet(len);
stream_read(stream,dp->buffer,len);
dp->pts=pts; //(float)pts/90000.0f;
dp->pos=pos;
// append packet to DS stream:
ds_add_packet(ds,dp);
}
// return value:
// 0 = EOF or no stream found or invalid type
// 1 = successfully read a packet
int demux_mpg_es_fill_buffer(demuxer_t *demux);
int demux_mpg_fill_buffer(demuxer_t *demux);
int demux_avi_fill_buffer(demuxer_t *demux);
int demux_avi_fill_buffer_ni(demuxer_t *demux,demux_stream_t *ds);
int demux_avi_fill_buffer_nini(demuxer_t *demux,demux_stream_t *ds);
int demux_asf_fill_buffer(demuxer_t *demux);
int demux_fill_buffer(demuxer_t *demux,demux_stream_t *ds){
// Note: parameter 'ds' can be NULL!
switch(demux->type){
case DEMUXER_TYPE_MPEG_ES: return demux_mpg_es_fill_buffer(demux);
case DEMUXER_TYPE_MPEG_PS: return demux_mpg_fill_buffer(demux);
case DEMUXER_TYPE_AVI: return demux_avi_fill_buffer(demux);
case DEMUXER_TYPE_AVI_NI: return demux_avi_fill_buffer_ni(demux,ds);
case DEMUXER_TYPE_AVI_NINI: return demux_avi_fill_buffer_nini(demux,ds);
case DEMUXER_TYPE_ASF: return demux_asf_fill_buffer(demux);
}
return 0;
}
// return value:
// 0 = EOF
// 1 = succesfull
inline static int ds_fill_buffer(demux_stream_t *ds){
demuxer_t *demux=ds->demuxer;
if(ds->buffer) free(ds->buffer);
if(verbose>2){
if(ds==demux->audio) printf("ds_fill_buffer(d_audio) called\n");else
if(ds==demux->video) printf("ds_fill_buffer(d_video) called\n");else
printf("ds_fill_buffer(unknown 0x%X) called\n",ds);
}
while(1){
if(ds->packs){
demux_packet_t *p=ds->first;
// copy useful data:
ds->buffer=p->buffer;
ds->buffer_pos=0;
ds->buffer_size=p->len;
ds->pos=p->pos;
ds->dpos+=p->len; // !!!
ds->pts=p->pts;
// free packet:
ds->bytes-=p->len;
ds->first=p->next;
if(!ds->first) ds->last=NULL;
free(p);
--ds->packs;
return 1; //ds->buffer_size;
}
if(demux->audio->packs>=MAX_PACKS || demux->audio->bytes>=MAX_PACK_BYTES){
printf("\nDEMUXER: Too many (%d in %d bytes) audio packets in the buffer!\n",demux->audio->packs,demux->audio->bytes);
printf("(maybe you play a non-interleaved stream/file or audio codec failed)\n");
break;
}
if(demux->video->packs>=MAX_PACKS || demux->video->bytes>=MAX_PACK_BYTES){
printf("\nDEMUXER: Too many (%d in %d bytes) video packets in the buffer!\n",demux->video->packs,demux->video->bytes);
printf("(maybe you play a non-interleaved stream/file or video codec failed)\n");
break;
}
if(!demux_fill_buffer(demux,ds)) break; // EOF
}
ds->buffer_pos=ds->buffer_size=0;
ds->buffer=NULL;
if(verbose) printf("ds_fill_buffer: EOF reached (stream: %s) \n",ds==demux->audio?"audio":"video");
ds->eof=1;
return 0;
}
inline int ds_tell(demux_stream_t *ds){
return (ds->dpos-ds->buffer_size)+ds->buffer_pos;
}
int demux_read_data(demux_stream_t *ds,char* mem,int len){
int x;
int bytes=0;
while(len>0){
x=ds->buffer_size-ds->buffer_pos;
if(x==0){
if(!ds_fill_buffer(ds)) return bytes;
} else {
if(x>len) x=len;
if(mem) memcpy(mem+bytes,&ds->buffer[ds->buffer_pos],x);
bytes+=x;len-=x;ds->buffer_pos+=x;
}
}
return bytes;
}
#if 1
#define demux_getc(ds) (\
(ds->buffer_pos<ds->buffer_size) ? ds->buffer[ds->buffer_pos++] \
:((!ds_fill_buffer(ds))? (-1) : ds->buffer[ds->buffer_pos++] ) )
#else
inline static int demux_getc(demux_stream_t *ds){
if(ds->buffer_pos>=ds->buffer_size){
if(!ds_fill_buffer(ds)){
// printf("DEMUX_GETC: EOF reached!\n");
return -1; // EOF
}
}
// printf("[%02X]",ds->buffer[ds->buffer_pos]);
return ds->buffer[ds->buffer_pos++];
}
#endif
void ds_free_packs(demux_stream_t *ds){
demux_packet_t *dp=ds->first;
while(dp){
demux_packet_t *dn=dp->next;
free(dp->buffer);
free(dp);
dp=dn;
}
if(ds->asf_packet){
// free unfinished .asf fragments:
free(ds->asf_packet->buffer);
free(ds->asf_packet);
ds->asf_packet=NULL;
}
ds->first=ds->last=NULL;
ds->packs=0; // !!!!!
ds->bytes=0;
if(ds->buffer) free(ds->buffer);
ds->buffer=NULL;
ds->buffer_pos=ds->buffer_size;
ds->pts=0;
}
int ds_get_packet(demux_stream_t *ds,char **start){
while(1){
int len;
if(ds->buffer_pos>=ds->buffer_size){
if(!ds_fill_buffer(ds)){
// EOF
*start = NULL;
return -1;
}
}
len=ds->buffer_size-ds->buffer_pos;
*start = &ds->buffer[ds->buffer_pos];
ds->buffer_pos+=len;
return len;
}
}