mirror of https://github.com/mpv-player/mpv
415 lines
11 KiB
C
415 lines
11 KiB
C
/*
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* demuxer for PVA files, such as the ones produced by software to manage DVB boards
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* like the Hauppauge WinTV DVBs, for MPlayer.
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*
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* Uses info from the PVA file specifications found at
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*
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* http://www.technotrend.de/download/av_format_v1.pdf
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*
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* Known issue:
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* - Does not seem to correctly demux files produced by MultiDec (on some channels).
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* They seem not to be correctly formatted. In fact, other DVB software which uses
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* the DVB board for playback plays them fine, but existing software which should
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* convert PVAs to MPEG-PS streams fails on them as well.
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* Feedback would be appreciated.
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*
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*
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* written by Matteo Giani
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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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 "stream.h"
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#include "demuxer.h"
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#include "stheader.h"
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#include "bswap.h"
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/*
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* #defines below taken from PVA spec (see URL above)
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*/
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#define PVA_MAX_VIDEO_PACK_LEN 6*1024
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#define VIDEOSTREAM 0x01
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#define MAINAUDIOSTREAM 0x02
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typedef struct {
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unsigned long offset;
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long size;
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uint8_t type;
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uint8_t is_packet_start;
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uint64_t pts;
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} pva_payload_t;
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typedef struct {
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float last_audio_pts;
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float last_video_pts;
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uint8_t just_synced;
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uint8_t synced_stream_id;
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} pva_priv_t;
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int pva_sync(demuxer_t * demuxer)
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{
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uint8_t buffer[5]={0,0,0,0,0};
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int count;
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pva_priv_t * priv = (pva_priv_t *) demuxer->priv;
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/* This is a hack. Since this function is called both for actual syncing and by
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* pva_check_file to check file type, we must check whether the priv structure has
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* already been allocated, otherwise we will dereference NULL and segfault.
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* So, if priv is NULL (not yet allocated) use a local variable, otherwise use priv->just_synced.
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* This field is in the priv structure so that pva_get_payload knows that pva_sync has already
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* read (part of) the PVA header. This way we can avoid to seek back and (hopefully) be able to read
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* from pipes and such.
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*/
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uint8_t local_synced=0;
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uint8_t * syncedptr;
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syncedptr=(priv==NULL)?&local_synced:&priv->just_synced;
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for(count=0 ; count<PVA_MAX_VIDEO_PACK_LEN && !demuxer->stream->eof && !*syncedptr ; count++)
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{
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buffer[0]=buffer[1];
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buffer[1]=buffer[2];
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buffer[2]=buffer[3];
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buffer[3]=buffer[4];
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buffer[4]=stream_read_char(demuxer->stream);
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/*
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* Check for a PVA packet beginning sequence: we check both the "AV" word at the
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* very beginning and the "0x55" reserved byte (which is unused and set to 0x55 by spec)
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*/
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if(buffer[0]=='A' && buffer[1] == 'V' && buffer[4] == 0x55) *syncedptr=1;
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//printf("demux_pva: pva_sync() current offset: %d\n",stream_tell(demuxer->stream));
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}
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if(*syncedptr)
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{
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if(priv!=NULL) priv->synced_stream_id=buffer[2];
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return 1;
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}
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else
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{
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return 0;
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}
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}
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int pva_check_file(demuxer_t * demuxer)
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{
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uint8_t buffer[5]={0,0,0,0,0};
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mp_msg(MSGT_DEMUX, MSGL_V, "Checking for PVA\n");
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stream_read(demuxer->stream,buffer,5);
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if(buffer[0]=='A' && buffer[1] == 'V' && buffer[4] == 0x55)
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{
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mp_msg(MSGT_DEMUX,MSGL_DBG2, "Success: PVA\n");
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return 1;
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}
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else
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{
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mp_msg(MSGT_DEMUX,MSGL_DBG2, "Failed: PVA\n");
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return 0;
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}
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}
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demuxer_t * demux_open_pva (demuxer_t * demuxer)
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{
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sh_video_t *sh_video = new_sh_video(demuxer,0);
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sh_audio_t * sh_audio = new_sh_audio(demuxer,0);
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pva_priv_t * priv;
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stream_reset(demuxer->stream);
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stream_seek(demuxer->stream,0);
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priv=malloc(sizeof(pva_priv_t));
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if(demuxer->stream->type!=STREAMTYPE_FILE) demuxer->seekable=0;
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else demuxer->seekable=1;
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demuxer->priv=priv;
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memset(demuxer->priv,0,sizeof(pva_priv_t));
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if(!pva_sync(demuxer))
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{
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mp_msg(MSGT_DEMUX,MSGL_ERR,"Not a PVA file.\n");
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return NULL;
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}
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//printf("priv->just_synced %s after initial sync!\n",priv->just_synced?"set":"UNSET");
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demuxer->video->sh=sh_video;
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demuxer->audio->sh=sh_audio;
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mp_msg(MSGT_DEMUXER,MSGL_INFO,"Opened PVA demuxer...\n");
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/*
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* Audio and Video codecs:
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* the PVA spec only allows MPEG2 video and MPEG layer II audio. No need to check the formats then.
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* Moreover, there would be no way to do that since the PVA stream format has no fields to describe
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* the used codecs.
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*/
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sh_video->format=0x10000002;
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sh_video->ds=demuxer->video;
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sh_audio->format=0x50;
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sh_audio->ds=demuxer->audio;
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priv->last_video_pts=-1;
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priv->last_audio_pts=-1;
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return demuxer;
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}
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int pva_get_payload(demuxer_t * d,pva_payload_t * payload);
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// 0 = EOF or no stream found
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// 1 = successfully read a packet
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int demux_pva_fill_buffer (demuxer_t * demux)
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{
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uint8_t done=0;
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demux_packet_t * dp;
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pva_priv_t * priv=demux->priv;
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pva_payload_t current_payload;
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while(!done)
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{
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if(!pva_get_payload(demux,¤t_payload)) return 0;
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switch(current_payload.type)
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{
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case VIDEOSTREAM:
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if(!current_payload.is_packet_start && priv->last_video_pts==-1)
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{
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/* We should only be here at the beginning of a stream, when we have
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* not yet encountered a valid Video PTS, or after a seek.
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* So, skip these starting packets in order not to deliver the
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* player a bogus PTS.
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*/
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done=0;
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}
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else
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{
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/*
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* In every other condition, we are delivering the payload. Set this
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* so that the following code knows whether to skip it or read it.
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*/
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done=1;
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}
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if(current_payload.is_packet_start)
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{
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priv->last_video_pts=((float)current_payload.pts)/90000;
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//mp_msg(MSGT_DEMUXER,MSGL_DBG2,"demux_pva: Video PTS=%llu , delivered %f\n",current_payload.pts,priv->last_video_pts);
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}
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if(done)
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{
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dp=new_demux_packet(current_payload.size);
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dp->pts=priv->last_video_pts;
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stream_read(demux->stream,dp->buffer,current_payload.size);
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ds_add_packet(demux->video,dp);
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}
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else
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{
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//printf("Skipping %u video bytes\n",current_payload.size);
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stream_skip(demux->stream,current_payload.size);
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}
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break;
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case MAINAUDIOSTREAM:
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if(!current_payload.is_packet_start && priv->last_audio_pts==-1)
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{
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/* Same as above for invalid video PTS, just for audio. */
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done=0;
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}
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else
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{
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done=1;
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}
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if(current_payload.is_packet_start)
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{
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priv->last_audio_pts=(float)current_payload.pts/90000;
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}
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if(done)
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{
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dp=new_demux_packet(current_payload.size);
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dp->pts=priv->last_audio_pts;
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stream_read(demux->stream,dp->buffer,current_payload.size);
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ds_add_packet(demux->audio,dp);
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}
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else
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{
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stream_skip(demux->stream,current_payload.size);
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}
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break;
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}
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}
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return 1;
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}
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int pva_get_payload(demuxer_t * d,pva_payload_t * payload)
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{
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uint8_t flags,pes_head_len;
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uint16_t pack_size;
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long long next_offset,pva_payload_start;
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unsigned char buffer[256];
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demux_packet_t * dp; //hack to deliver the preBytes (see PVA doc)
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pva_priv_t * priv=(pva_priv_t *) d->priv;
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if(d==NULL)
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{
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printf("demux_pva: pva_get_payload got passed a NULL pointer!\n");
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return 0;
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}
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if(d->stream->eof)
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{
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mp_msg(MSGT_DEMUX,MSGL_V,"demux_pva: pva_get_payload() detected stream->eof!!!\n");
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return 0;
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}
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//printf("priv->just_synced %s\n",priv->just_synced?"SET":"UNSET");
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if(!priv->just_synced)
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{
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if(stream_read_word(d->stream) != (('A'<<8)|'V'))
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{
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mp_msg(MSGT_DEMUX,MSGL_V,"demux_pva: pva_get_payload() missed a SyncWord at %ld!! Trying to sync...\n",stream_tell(d->stream));
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if(!pva_sync(d)) return 0;
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}
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}
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if(priv->just_synced)
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{
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payload->type=priv->synced_stream_id;
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priv->just_synced=0;
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}
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else
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{
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payload->type=stream_read_char(d->stream);
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stream_skip(d->stream,2); //counter and reserved
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}
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flags=stream_read_char(d->stream);
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payload->is_packet_start=flags & 0x10;
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pack_size=le2me_16(stream_read_word(d->stream));
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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);
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pva_payload_start=stream_tell(d->stream);
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next_offset=pva_payload_start+pack_size;
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if(!payload->is_packet_start)
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{
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payload->offset=stream_tell(d->stream);
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payload->size=pack_size;
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}
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else
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{ //here comes the good part...
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switch(payload->type)
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{
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case VIDEOSTREAM:
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payload->pts=le2me_32(stream_read_dword(d->stream));
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//printf("Video PTS: %llu\n",payload->pts);
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if((flags&0x03) && ((pva_priv_t *)d->priv)->last_video_pts!=-1)
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{
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dp=new_demux_packet(flags&0x03);
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stream_read(d->stream,dp->buffer,flags & 0x03); //read PreBytes
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dp->pts=((pva_priv_t *)d->priv)->last_video_pts;
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ds_add_packet(d->video,dp);
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}
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else
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{
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stream_skip(d->stream,flags&0x03);
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}
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//now we are at real beginning of payload.
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payload->offset=stream_tell(d->stream);
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//size is pack_size minus PTS size minus padding size.
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payload->size=pack_size - 4 - (flags & 0x03);
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break;
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case MAINAUDIOSTREAM:
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stream_skip(d->stream,8); //FIXME properly parse PES header.
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//assuming byte 8 is PES residual header length.
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pes_head_len=stream_read_char(d->stream);
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stream_read(d->stream,buffer,pes_head_len);
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//we should now be on start of real payload.
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//let's now parse the PTS...
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if((buffer[0] & 0xf0)!=0x20)
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{
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mp_msg(MSGT_DEMUX,MSGL_ERR,"demux_pva: expected audio PTS but badly formatted... (read 0x%02X)\n",buffer[0]);
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return 0;
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}
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payload->pts=0LL;
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payload->pts|=((uint64_t)(buffer[0] & 0x0e) << 29);
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payload->pts|=buffer[1]<<22;
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payload->pts|=(buffer[2] & 0xfe) << 14;
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payload->pts|=buffer[3]<<7;
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payload->pts|=(buffer[4] & 0xfe) >> 1;
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/*
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* PTS parsing is hopefully finished.
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* Let's now fill in offset and size.
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*/
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payload->pts=le2me_64(payload->pts);
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payload->offset=stream_tell(d->stream);
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payload->size=pack_size-stream_tell(d->stream)+pva_payload_start;
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break;
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}
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}
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return 1;
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}
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int demux_seek_pva(demuxer_t * demuxer,float rel_seek_secs,int flags)
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{
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int total_bitrate=0;
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long dest_offset;
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pva_priv_t * priv=demuxer->priv;
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total_bitrate=((sh_audio_t *)demuxer->audio->sh)->i_bps + ((sh_video_t *)demuxer->video->sh)->i_bps;
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/*
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* Compute absolute offset inside the stream. Approximate total bitrate with sum of bitrates
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* reported by the audio and video codecs. The seek is not accurate because, just like
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* with MPEG streams, the bitrate is not constant. Moreover, we do not take into account
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* the overhead caused by PVA and PES headers.
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* If the calculated absolute offset is negative, seek to the beginning of the file.
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*/
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dest_offset=stream_tell(demuxer->stream)+rel_seek_secs*total_bitrate;
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if(dest_offset<0) dest_offset=0;
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stream_seek(demuxer->stream,dest_offset);
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if(!pva_sync(demuxer))
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{
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mp_msg(MSGT_DEMUX,MSGL_V,"demux_pva: Couldn't seek!\n");
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return 0;
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}
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/*
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* Reset the PTS info inside the pva_priv_t structure. This way we don't deliver
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* data with the wrong PTSs (the ones we had before seeking).
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*
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*/
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priv->last_video_pts=-1;
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priv->last_audio_pts=-1;
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return 1;
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}
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void demux_close_pva(demuxer_t * demuxer)
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{
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if(demuxer->priv)
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{
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free(demuxer->priv);
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demuxer->priv=NULL;
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}
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}
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