* Fix for the broken MultiDec files I had originally posted with the

first version of the demuxer. They play ok now. Fix can be disabled through conditional compiling, so just comment out the #define directive if it breaks anything (see source). * Demuxer now honours audio/video ids. Since PVAs only contain one audio track and one video track by specification, they are vid 0 and aid 0. This also fixes the "too many audio/video packets in buffer" with -dump[audio|video]. * substituted longs with off_t's for offsets, so that it should work on large files. patch by Matteo Giani <matgiani@ctonet.it> git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@7664 b3059339-0415-0410-9bf9-f77b7e298cf2
2025-03-20 18:28:01 +00:00 · 2002-10-07 22:13:34 +00:00 · 2002-10-07 22:13:34 +00:00 · feec550941
commit feec550941
parent a6450205ee
1 changed files with 164 additions and 62 deletions
--- a/libmpdemux/demux_pva.c
+++ b/libmpdemux/demux_pva.c
@ -6,17 +6,17 @@
 * 
 * http://www.technotrend.de/download/av_format_v1.pdf
 * 
- * Known issue:
- * - Does not seem to correctly demux files produced by MultiDec (on some channels).
- *   They seem not to be correctly formatted. In fact, other DVB software which uses
- *   the DVB board for playback plays them fine, but existing software which should
- *   convert PVAs to MPEG-PS streams fails on them as well.
- *   Feedback would be appreciated.
+ * WARNING: Quite a hack was required in order to get files by MultiDec played back correctly.
+ * If it breaks anything else, just comment out the "#define DEMUX_PVA_MULTIDEC_HACK" below
+ * and it will not be compiled in.
 *
+ * Feedback is appreciated.
 *
 * written by Matteo Giani
 */

+#define DEMUX_PVA_MULTIDEC_HACK
+#define PVA_NEW_PREBYTES_CODE

 #include <stdio.h>
 #include <stdlib.h>
@ -42,44 +42,44 @@
 #define MAINAUDIOSTREAM 0x02

 typedef struct {
-	unsigned long offset;
+	off_t offset;
 	long size;
 	uint8_t type;
 	uint8_t is_packet_start;
-	uint64_t pts;
+	float pts;
 } pva_payload_t;


 typedef struct {
 	float last_audio_pts;
 	float last_video_pts;
+#ifdef PVA_NEW_PREBYTES_CODE
+	float video_pts_after_prebytes;
+	long video_size_after_prebytes;
+	uint8_t prebytes_delivered;
+#endif
 	uint8_t just_synced;
 	uint8_t synced_stream_id;
 } pva_priv_t;


+
 int pva_sync(demuxer_t * demuxer)
 {
 	uint8_t buffer[5]={0,0,0,0,0};
 	int count;
 	pva_priv_t * priv = (pva_priv_t *) demuxer->priv;
-	
-	/* This is a hack. Since this function is called both for actual syncing and by
-	 * pva_check_file to check file type, we must check whether the priv structure has
-	 * already been allocated, otherwise we will dereference NULL and segfault.
-	 * So, if priv is NULL (not yet allocated) use a local variable, otherwise use priv->just_synced.
-	 * This field is in the priv structure so that pva_get_payload knows that pva_sync has already
-	 * read (part of) the PVA header. This way we can avoid to seek back and (hopefully) be able to read
-	 * from pipes and such.
-	 */
-	
-	uint8_t local_synced=0;
-	uint8_t * syncedptr;
-
-	syncedptr=(priv==NULL)?&local_synced:&priv->just_synced;

 	
-	for(count=0 ; count<PVA_MAX_VIDEO_PACK_LEN && !demuxer->stream->eof && !*syncedptr ; count++)
+	 /* This function is used to find the next nearest PVA packet start after a seek, since a PVA file
+	  * is not indexed.
+	  * The just_synced field is in the priv structure so that pva_get_payload knows pva_sync
+	  * has already read (part of) the PVA header. This way we can avoid to seek back and (hopefully)
+	  * be able to read from pipes and such.
+	  */
+	
+	
+	for(count=0 ; count<PVA_MAX_VIDEO_PACK_LEN && !demuxer->stream->eof && !priv->just_synced ; count++)
 	{
 		buffer[0]=buffer[1];
 		buffer[1]=buffer[2];
@ -90,10 +90,10 @@ int pva_sync(demuxer_t * demuxer)
 		 * Check for a PVA packet beginning sequence: we check both the "AV" word at the 
 		 * very beginning and the "0x55" reserved byte (which is unused and set to 0x55 by spec)
 		 */
-		if(buffer[0]=='A' && buffer[1] == 'V' && buffer[4] == 0x55) *syncedptr=1;
-		//printf("demux_pva: pva_sync() current offset: %d\n",stream_tell(demuxer->stream));
+		if(buffer[0]=='A' && buffer[1] == 'V' && buffer[4] == 0x55) priv->just_synced=1;
+		//printf("demux_pva: pva_sync(): current offset= %ld\n",stream_tell(demuxer->stream));
 	}
-	if(*syncedptr)
+	if(priv->just_synced)
 	{
 		if(priv!=NULL) priv->synced_stream_id=buffer[2];
 		return 1;
@ -124,7 +124,9 @@ int pva_check_file(demuxer_t * demuxer)
 demuxer_t * demux_open_pva (demuxer_t * demuxer)
 {
 	sh_video_t *sh_video = new_sh_video(demuxer,0);
-	sh_audio_t * sh_audio = new_sh_audio(demuxer,0);
+        sh_audio_t *sh_audio = new_sh_audio(demuxer,0);
+
+	
 	pva_priv_t * priv;
 	
 	stream_reset(demuxer->stream);
@ -149,7 +151,10 @@ demuxer_t * demux_open_pva (demuxer_t * demuxer)
 	//printf("priv->just_synced %s after initial sync!\n",priv->just_synced?"set":"UNSET");
 	
 	demuxer->video->sh=sh_video;
-	demuxer->audio->sh=sh_audio;
+	
+	//printf("demuxer->stream->end_pos= %d\n",demuxer->stream->end_pos);
+
+	
 	mp_msg(MSGT_DEMUXER,MSGL_INFO,"Opened PVA demuxer...\n");
 	
 	/*
@ -162,9 +167,18 @@ demuxer_t * demux_open_pva (demuxer_t * demuxer)
 	sh_video->format=0x10000002;
 	sh_video->ds=demuxer->video;
 		
+	/*
+	printf("demuxer->video->id==%d\n",demuxer->video->id);
+	printf("demuxer->audio->id==%d\n",demuxer->audio->id);
+	*/
+	
+	demuxer->audio->sh=sh_audio;
 	sh_audio->format=0x50;
 	sh_audio->ds=demuxer->audio;
-
+	
+	demuxer->movi_start=0;
+	demuxer->movi_end=demuxer->stream->end_pos;
+	
 	priv->last_video_pts=-1;
 	priv->last_audio_pts=-1;

@ -188,6 +202,7 @@ int demux_pva_fill_buffer (demuxer_t * demux)
 		switch(current_payload.type)
 		{
 			case VIDEOSTREAM:
+				if(demux->video->id==-1) demux->video->id=0;
 				if(!current_payload.is_packet_start && priv->last_video_pts==-1)
 				{
 					/* We should only be here at the beginning of a stream, when we have
@ -205,9 +220,10 @@ int demux_pva_fill_buffer (demuxer_t * demux)
 					 */
 					done=1;
 				}
+				if(demux->video->id!=0) done=0;
 				if(current_payload.is_packet_start)
 				{
-					priv->last_video_pts=((float)current_payload.pts)/90000;
+					priv->last_video_pts=current_payload.pts;
 					//mp_msg(MSGT_DEMUXER,MSGL_DBG2,"demux_pva: Video PTS=%llu , delivered %f\n",current_payload.pts,priv->last_video_pts);
 				}
 				if(done)
@ -224,6 +240,7 @@ int demux_pva_fill_buffer (demuxer_t * demux)
 				}
 				break;
 			case MAINAUDIOSTREAM:
+				if(demux->audio->id==-1) demux->audio->id=0;
 				if(!current_payload.is_packet_start && priv->last_audio_pts==-1)
 				{
 					/* Same as above for invalid video PTS, just for audio. */
@ -235,12 +252,15 @@ int demux_pva_fill_buffer (demuxer_t * demux)
 				}
 				if(current_payload.is_packet_start)
 				{
-					priv->last_audio_pts=(float)current_payload.pts/90000;
+					priv->last_audio_pts=current_payload.pts;
 				}
+				if(demux->audio->id!=0) done=0;
 				if(done)
 				{
 					dp=new_demux_packet(current_payload.size);
 					dp->pts=priv->last_audio_pts;
+					if(current_payload.offset != stream_tell(demux->stream))
+						stream_seek(demux->stream,current_payload.offset);
 					stream_read(demux->stream,dp->buffer,current_payload.size);
 					ds_add_packet(demux->audio,dp);
 				}
@ -258,7 +278,7 @@ int pva_get_payload(demuxer_t * d,pva_payload_t * payload)
 {
 	uint8_t flags,pes_head_len;
 	uint16_t pack_size;
-	long long next_offset,pva_payload_start;
+	off_t next_offset,pva_payload_start;
 	unsigned char buffer[256];
 	demux_packet_t * dp; 	//hack to deliver the preBytes (see PVA doc)
 	pva_priv_t * priv=(pva_priv_t *) d->priv;
@ -266,10 +286,14 @@ int pva_get_payload(demuxer_t * d,pva_payload_t * payload)
 	
 	if(d==NULL)
 	{
-		printf("demux_pva: pva_get_payload got passed a NULL pointer!\n");
+		mp_msg(MSGT_DEMUX,MSGL_ERR,"demux_pva: pva_get_payload got passed a NULL pointer!\n");
 		return 0;
 	}

+	d->filepos=stream_tell(d->stream);
+	
+	
+	
 	
 	if(d->stream->eof)
 	{
@ -278,12 +302,37 @@ int pva_get_payload(demuxer_t * d,pva_payload_t * payload)
 	}

 	//printf("priv->just_synced %s\n",priv->just_synced?"SET":"UNSET");
+	
+#ifdef PVA_NEW_PREBYTES_CODE
+	if(priv->prebytes_delivered)
+		/* The previous call to this fn has delivered the preBytes. Then we are already inside
+		 * the payload. Let's just deliver the video along with its right PTS, the one we stored
+		 * in the priv structure and was in the PVA header before the PreBytes.
+		 */
+	{
+		//printf("prebytes_delivered=1. Resetting.\n");
+		payload->size = priv->video_size_after_prebytes;
+		payload->pts = priv->video_pts_after_prebytes;
+		payload->is_packet_start = 1;
+		payload->offset = stream_tell(d->stream);
+		payload->type = VIDEOSTREAM;
+		priv->prebytes_delivered = 0;
+		return 1;
+	}
+#endif	
 	if(!priv->just_synced)
 	{
 		if(stream_read_word(d->stream) != (('A'<<8)|'V'))
 		{
 			mp_msg(MSGT_DEMUX,MSGL_V,"demux_pva: pva_get_payload() missed a SyncWord at %ld!! Trying to sync...\n",stream_tell(d->stream));
-			if(!pva_sync(d)) return 0;
+			if(!pva_sync(d))
+			{
+				if (!d->stream->eof)
+				{
+					mp_msg(MSGT_DEMUX,MSGL_ERR,"demux_pva: couldn't sync! (broken file?)");
+				}
+				return 0;
+			}
 		}
 	}
 	if(priv->just_synced)
@ -302,6 +351,32 @@ int pva_get_payload(demuxer_t * d,pva_payload_t * payload)
 	mp_msg(MSGT_DEMUX,MSGL_DBG2,"demux_pva::pva_get_payload(): pack_size=%u field read at offset %lu\n",pack_size,stream_tell(d->stream)-2);
 	pva_payload_start=stream_tell(d->stream);
 	next_offset=pva_payload_start+pack_size;
+
+
+	/*
+	 * The code in the #ifdef directive below is a hack needed to get badly formatted PVA files
+	 * such as the ones written by MultiDec played back correctly.
+	 * Basically, it works like this: if the PVA packet does not signal a PES header, but the
+	 * payload looks like one, let's assume it IS one. It has worked for me up to now.
+	 * It can be disabled since it's quite an ugly hack and could potentially break things up
+	 * if the PVA audio payload happens to start with 0x000001 even without being a non signalled
+	 * PES header start.
+	 * Though it's quite unlikely, it potentially could (AFAIK).
+	 */
+#ifdef DEMUX_PVA_MULTIDEC_HACK
+	if(payload->type==MAINAUDIOSTREAM)
+	{
+		stream_read(d->stream,buffer,3);
+		if(buffer[0]==0x00 && buffer[1]==0x00 && buffer[2]==0x01 && !payload->is_packet_start)
+		{
+			mp_msg(MSGT_DEMUX,MSGL_V,"demux_pva: suspecting non signaled audio PES packet start. Maybe file by MultiDec?\n");
+			payload->is_packet_start=1;
+		}
+		stream_seek(d->stream,stream_tell(d->stream)-3);
+	}
+#endif
+
+	
 	if(!payload->is_packet_start)
 	{
 		payload->offset=stream_tell(d->stream);
@ -312,48 +387,75 @@ int pva_get_payload(demuxer_t * d,pva_payload_t * payload)
 		switch(payload->type)
 		{
 			case VIDEOSTREAM:
-				payload->pts=le2me_32(stream_read_dword(d->stream));
-				//printf("Video PTS: %llu\n",payload->pts);
-				if((flags&0x03) && ((pva_priv_t *)d->priv)->last_video_pts!=-1)
+				payload->pts=(float)(le2me_32(stream_read_dword(d->stream)))/90000;
+				//printf("Video PTS: %f\n",payload->pts);
+				if((flags&0x03) 
+#ifdef PVA_NEW_PREBYTES_CODE
+						&& !priv->prebytes_delivered
+#endif
+						)
 				{
+#ifndef PVA_NEW_PREBYTES_CODE					
 					dp=new_demux_packet(flags&0x03);
 					stream_read(d->stream,dp->buffer,flags & 0x03); //read PreBytes
-					dp->pts=((pva_priv_t *)d->priv)->last_video_pts;
 					ds_add_packet(d->video,dp);
+#else
+					//printf("Delivering prebytes. Setting prebytes_delivered.");
+					payload->offset=stream_tell(d->stream);
+					payload->size = flags & 0x03;
+					priv->video_pts_after_prebytes = payload->pts;
+					priv->video_size_after_prebytes = pack_size - 4 - (flags & 0x03);
+					payload->pts=priv->last_video_pts;
+					payload->is_packet_start=0;
+					priv->prebytes_delivered=1;
+					return 1;
+#endif
 				}
-				else
-				{
-					stream_skip(d->stream,flags&0x03);
-				}
+				

 				//now we are at real beginning of payload.
 				payload->offset=stream_tell(d->stream);
-				//size is pack_size minus PTS size minus padding size.
+				//size is pack_size minus PTS size minus PreBytes size.
 				payload->size=pack_size - 4 - (flags & 0x03);
 				break;
 			case MAINAUDIOSTREAM:
-				stream_skip(d->stream,8); //FIXME properly parse PES header.
-				//assuming byte 8 is PES residual header length.
+				stream_skip(d->stream,3); //FIXME properly parse PES header.
+				//printf("StreamID in audio PES header: 0x%2X\n",stream_read_char(d->stream));
+				stream_skip(d->stream,4);
+				
+				buffer[255]=stream_read_char(d->stream);			
 				pes_head_len=stream_read_char(d->stream);
 				stream_read(d->stream,buffer,pes_head_len);
-				//we should now be on start of real payload.
-				//let's now parse the PTS...
-				if((buffer[0] & 0xf0)!=0x20)
+				if(!buffer[255]&0x80) //PES header does not contain PTS.
 				{
-					mp_msg(MSGT_DEMUX,MSGL_ERR,"demux_pva: expected audio PTS but badly formatted... (read 0x%02X)\n",buffer[0]);
-					return 0;
+					mp_msg(MSGT_DEMUX,MSGL_V,"Audio PES packet does not contain PTS. (pes_head_len=%d)\n",pes_head_len);
+					payload->pts=priv->last_audio_pts;
+					break;
+				}			
+				else		//PES header DOES contain PTS
+				{
+					if((buffer[0] & 0xf0)!=0x20) // PTS badly formatted
+					{
+						mp_msg(MSGT_DEMUX,MSGL_V,"demux_pva: expected audio PTS but badly formatted... (read 0x%02X). Falling back to previous PTS (hack).\n",buffer[0]);
+						payload->pts=priv->last_audio_pts;
+					//	return 0;
+					}
+					else
+					{
+						uint64_t temp_pts;
+					
+						temp_pts=0LL;
+						temp_pts|=((uint64_t)(buffer[0] & 0x0e) << 29);
+						temp_pts|=buffer[1]<<22;
+						temp_pts|=(buffer[2] & 0xfe) << 14;
+						temp_pts|=buffer[3]<<7;
+						temp_pts|=(buffer[4] & 0xfe) >> 1;
+						/*
+					 	* PTS parsing is hopefully finished.
+					 	*/
+						payload->pts=(float)le2me_64(temp_pts)/90000;
+					}
 				}
-				payload->pts=0LL;
-				payload->pts|=((uint64_t)(buffer[0] & 0x0e) << 29);
-				payload->pts|=buffer[1]<<22;
-				payload->pts|=(buffer[2] & 0xfe) << 14;
-				payload->pts|=buffer[3]<<7;
-				payload->pts|=(buffer[4] & 0xfe) >> 1;
-				/*
-				 * PTS parsing is hopefully finished.
-				 * Let's now fill in offset and size.
-				 */
-				payload->pts=le2me_64(payload->pts);
 				payload->offset=stream_tell(d->stream);
 				payload->size=pack_size-stream_tell(d->stream)+pva_payload_start;
 				break;
@ -365,7 +467,7 @@ int pva_get_payload(demuxer_t * d,pva_payload_t * payload)
 int demux_seek_pva(demuxer_t * demuxer,float rel_seek_secs,int flags)
 {
 	int total_bitrate=0;
-	long dest_offset;
+	off_t dest_offset;
 	pva_priv_t * priv=demuxer->priv;
 	
 	total_bitrate=((sh_audio_t *)demuxer->audio->sh)->i_bps + ((sh_video_t *)demuxer->video->sh)->i_bps;