--- /dev/null
+/*****************************************************************************
+ * pva.c: PVA demuxer
+ *****************************************************************************
+ * Copyright (C) 2004 VideoLAN
+ * $Id: pva.c,v 1.1 2004/01/23 17:42:10 fenrir Exp $
+ *
+ * Authors: Laurent Aimar <fenrir@via.ecp.fr>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
+ *****************************************************************************/
+
+/*****************************************************************************
+ * Preamble
+ *****************************************************************************/
+#include <stdlib.h> /* malloc(), free() */
+
+#include <vlc/vlc.h>
+#include <vlc/input.h>
+
+/* TODO:
+ * - ...
+ */
+
+/*****************************************************************************
+ * Module descriptor
+ *****************************************************************************/
+static int Open ( vlc_object_t * );
+static void Close ( vlc_object_t * );
+
+vlc_module_begin();
+ set_description( _("PVA demuxer" ) );
+ set_capability( "demux2", 10 );
+ set_callbacks( Open, Close );
+ add_shortcut( "pva" );
+vlc_module_end();
+
+/*****************************************************************************
+ * Local prototypes
+ *****************************************************************************/
+
+struct demux_sys_t
+{
+ es_out_id_t *p_video;
+ es_out_id_t *p_audio;
+
+ /* counter */
+ int i_vc;
+ int i_ac;
+
+ /* audio/video block */
+ block_t *p_pes; /* audio */
+ block_t *p_es; /* video */
+
+ int64_t b_pcr_audio;
+};
+
+static int Demux ( demux_t *p_demux );
+static int Control ( demux_t *p_demux, int i_query, va_list args );
+
+static int ReSynch ( demux_t * );
+static void ParsePES( demux_t * );
+
+/*****************************************************************************
+ * Open
+ *****************************************************************************/
+static int Open( vlc_object_t *p_this )
+{
+ demux_t *p_demux = (demux_t*)p_this;
+ demux_sys_t *p_sys;
+ es_format_t fmt;
+ uint8_t *p_peek;
+
+ if( stream_Peek( p_demux->s, &p_peek, 5 ) < 5 )
+ {
+ msg_Err( p_demux, "cannot peek" );
+ return VLC_EGENERIC;
+ }
+ if( p_peek[0] != 'A' || p_peek[1] != 'V' || p_peek[4] != 0x55 )
+ {
+ /* In case we had forced this demuxer we try to resynch */
+ if( strcasecmp( p_demux->psz_demux, "pva" ) || ReSynch( p_demux ) )
+ {
+ msg_Warn( p_demux, "PVA module discarded" );
+ return VLC_EGENERIC;
+ }
+ }
+
+ /* Fill p_demux field */
+ p_demux->pf_demux = Demux;
+ p_demux->pf_control = Control;
+ p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
+
+ /* Register one audio and one video stream */
+ es_format_Init( &fmt, AUDIO_ES, VLC_FOURCC( 'm', 'p', 'g', 'a' ) );
+ p_sys->p_audio = es_out_Add( p_demux->out, &fmt );
+
+ es_format_Init( &fmt, VIDEO_ES, VLC_FOURCC( 'm', 'p', 'g', 'v' ) );
+ p_sys->p_video = es_out_Add( p_demux->out, &fmt );
+
+ p_sys->i_vc = -1;
+ p_sys->i_ac = -1;
+ p_sys->p_pes = NULL;
+ p_sys->p_es = NULL;
+
+ p_sys->b_pcr_audio = VLC_FALSE;
+
+ return VLC_SUCCESS;
+}
+
+/*****************************************************************************
+ * Close
+ *****************************************************************************/
+static void Close( vlc_object_t *p_this )
+{
+ demux_t *p_demux = (demux_t*)p_this;
+ demux_sys_t *p_sys = p_demux->p_sys;
+
+ if( p_sys->p_es ) block_Release( p_sys->p_es );
+ if( p_sys->p_pes ) block_Release( p_sys->p_pes );
+
+ free( p_sys );
+}
+
+
+/*****************************************************************************
+ * Demux:
+ *****************************************************************************/
+static int Demux( demux_t *p_demux )
+{
+ demux_sys_t *p_sys = p_demux->p_sys;
+
+ uint8_t *p_peek;
+ int i_size;
+ block_t *p_frame;
+ int64_t i_pts;
+ int i_skip;
+
+ if( stream_Peek( p_demux->s, &p_peek, 8 ) < 8 )
+ {
+ msg_Warn( p_demux, "eof ?" );
+ return 0;
+ }
+ if( p_peek[0] != 'A' || p_peek[1] != 'V' || p_peek[4] != 0x55 )
+ {
+ msg_Warn( p_demux, "lost synchro" );
+ if( ReSynch( p_demux ) )
+ {
+ return -1;
+ }
+ if( stream_Peek( p_demux->s, &p_peek, 8 ) < 8 )
+ {
+ msg_Warn( p_demux, "eof ?" );
+ return 0;
+ }
+ }
+
+ i_size = GetWBE( &p_peek[6] );
+ switch( p_peek[2] )
+ {
+ case 0x01: /* VideoStream */
+ if( p_sys->i_vc < 0 )
+ {
+ msg_Dbg( p_demux, "first packet for video" );
+ }
+ else if( ((p_sys->i_vc + 1)&0xff) != p_peek[3] )
+ {
+ msg_Dbg( p_demux, "packet lost (video)" );
+ if( p_sys->p_es )
+ {
+ block_ChainRelease( p_sys->p_es );
+ p_sys->p_es = NULL;
+ }
+ }
+ p_sys->i_vc = p_peek[3];
+
+ /* read the PTS and potential extra bytes TODO: make it a bit more optimised */
+ i_pts = -1;
+ i_skip = 8;
+ if( p_peek[5]&0x10 )
+ {
+ int i_pre = p_peek[5]&0x3;
+
+ if( ( p_frame = stream_Block( p_demux->s, 8 + 4 + i_pre ) ) )
+ {
+ i_pts = GetDWBE( &p_frame->p_buffer[8] );
+ if( p_frame->i_buffer > 12 )
+ {
+ p_frame->p_buffer += 12;
+ p_frame->i_buffer -= 12;
+ block_ChainAppend( &p_sys->p_es, p_frame );
+ }
+ else
+ {
+ block_Release( p_frame );
+ }
+ }
+ i_size -= 4 + i_pre;
+ i_skip = 0;
+ /* Set PCR */
+ if( ( p_frame = p_sys->p_es ) )
+ {
+
+ if( p_frame->i_pts > 0 && !p_sys->b_pcr_audio )
+ {
+ es_out_Control( p_demux->out, ES_OUT_SET_PCR, (int64_t)p_frame->i_pts);
+ }
+ es_out_Send( p_demux->out, p_sys->p_video, p_frame );
+
+ p_sys->p_es = NULL;
+ }
+ }
+
+ if( ( p_frame = stream_Block( p_demux->s, i_size + i_skip ) ) )
+ {
+ p_frame->p_buffer += i_skip;
+ p_frame->i_buffer -= i_skip;
+ if( i_pts > 0 ) p_frame->i_pts = i_pts * 100 / 9;
+ block_ChainAppend( &p_sys->p_es, p_frame );
+ }
+ break;
+
+ case 0x02: /* MainAudioStream */
+ if( p_sys->i_ac < 0 )
+ {
+ msg_Dbg( p_demux, "first packet for audio" );
+ }
+ else if( ((p_sys->i_ac + 1)&0xff) != p_peek[3] )
+ {
+ msg_Dbg( p_demux, "packet lost (audio)" );
+ if( p_sys->p_pes )
+ {
+ block_ChainRelease( p_sys->p_pes );
+ p_sys->p_pes = NULL;
+ }
+ }
+ p_sys->i_ac = p_peek[3];
+
+ if( p_peek[5]&0x10 && p_sys->p_pes )
+ {
+ ParsePES( p_demux );
+ }
+ if( ( p_frame = stream_Block( p_demux->s, i_size + 8 ) ) )
+ {
+ p_frame->p_buffer += 8;
+ p_frame->i_buffer -= 8;
+ /* XXX this a hack, some streams aren't compliant and
+ * doesn't set pes_start flag */
+ if( p_sys->p_pes && p_frame->i_buffer > 4 &&
+ p_frame->p_buffer[0] == 0x00 &&
+ p_frame->p_buffer[1] == 0x00 &&
+ p_frame->p_buffer[2] == 0x01 )
+ {
+ ParsePES( p_demux );
+ }
+ block_ChainAppend( &p_sys->p_pes, p_frame );
+ }
+ break;
+
+ default:
+ msg_Warn( p_demux, "unknown id=0x%x", p_peek[2] );
+ stream_Read( p_demux->s, NULL, i_size + 8 );
+ break;
+ }
+ return 1;
+}
+
+/*****************************************************************************
+ * Control:
+ *****************************************************************************/
+static int Control( demux_t *p_demux, int i_query, va_list args )
+{
+ /* demux_sys_t *p_sys = p_demux->p_sys; */
+ double f, *pf;
+ int64_t i64;
+ switch( i_query )
+ {
+ case DEMUX_GET_POSITION:
+ if( ( i64 = stream_Size( p_demux->s ) ) > 0 )
+ {
+ pf = (double*) va_arg( args, double* );
+ *pf = (double)stream_Tell( p_demux->s ) / (double)i64;
+ return VLC_SUCCESS;
+ }
+ return VLC_EGENERIC;
+
+ case DEMUX_SET_POSITION:
+ f = (double) va_arg( args, double );
+ i64 = stream_Size( p_demux->s );
+
+ es_out_Control( p_demux->out, ES_OUT_RESET_PCR );
+ if( stream_Seek( p_demux->s, (int64_t)(i64 * f) ) || ReSynch( p_demux ) )
+ {
+ return VLC_EGENERIC;
+ }
+ return VLC_SUCCESS;
+
+#if 0
+ case DEMUX_GET_TIME:
+ pi64 = (int64_t*)va_arg( args, int64_t * );
+ if( p_sys->i_time < 0 )
+ {
+ *pi64 = 0;
+ return VLC_EGENERIC;
+ }
+ *pi64 = p_sys->i_time;
+ return VLC_SUCCESS;
+
+#if 0
+ case DEMUX_GET_LENGTH:
+ pi64 = (int64_t*)va_arg( args, int64_t * );
+ if( p_sys->i_mux_rate > 0 )
+ {
+ *pi64 = (int64_t)1000000 * ( stream_Size( p_demux->s ) / 50 ) / p_sys->i_mux_rate;
+ return VLC_SUCCESS;
+ }
+ *pi64 = 0;
+ return VLC_EGENERIC;
+
+ case DEMUX_SET_TIME:
+#endif
+ case DEMUX_GET_FPS:
+ pf = (double*)va_arg( args, double * );
+ *pf = (double)1000000.0 / (double)p_sys->i_pcr_inc;
+ return VLC_SUCCESS;
+#endif
+ default:
+ return VLC_EGENERIC;
+ }
+}
+
+/*****************************************************************************
+ * ReSynch:
+ *****************************************************************************/
+static int ReSynch( demux_t *p_demux )
+{
+ uint8_t *p_peek;
+ int i_skip;
+ int i_peek;
+
+ while( !p_demux->b_die )
+ {
+ if( ( i_peek = stream_Peek( p_demux->s, &p_peek, 1024 ) ) < 8 )
+ {
+ return VLC_EGENERIC;
+ }
+ i_skip = 0;
+
+ while( i_skip < i_peek - 5 )
+ {
+ if( p_peek[0] == 'A' && p_peek[1] == 'V' && p_peek[4] == 0x55 )
+ {
+ if( i_skip > 0 )
+ {
+ stream_Read( p_demux->s, NULL, i_skip );
+ }
+ return VLC_SUCCESS;
+ }
+ p_peek++;
+ i_skip++;
+ }
+
+ stream_Read( p_demux->s, NULL, i_skip );
+ }
+
+ return VLC_EGENERIC;
+}
+
+static void ParsePES( demux_t *p_demux )
+{
+ demux_sys_t *p_sys = p_demux->p_sys;
+ block_t *p_pes = p_sys->p_pes;
+ uint8_t hdr[30];
+ int i_pes_size;
+
+ int i_skip;
+ mtime_t i_dts = -1;
+ mtime_t i_pts = -1;
+
+ p_sys->p_pes = NULL;
+
+ /* FIXME find real max size */
+ block_ChainExtract( p_pes, hdr, 30 );
+
+ if( hdr[0] != 0 || hdr[1] != 0 || hdr[2] != 1 )
+ {
+ msg_Warn( p_demux, "invalid hdr [0x%2.2x:%2.2x:%2.2x:%2.2x]",
+ hdr[0], hdr[1],hdr[2],hdr[3] );
+ block_ChainRelease( p_pes );
+ return;
+ }
+ i_pes_size = GetWBE( &hdr[4] );
+
+ /* we assume mpeg2 PES */
+ i_skip = hdr[8] + 9;
+ if( hdr[7]&0x80 ) /* has pts */
+ {
+ i_pts = ((mtime_t)(hdr[ 9]&0x0e ) << 29)|
+ (mtime_t)(hdr[10] << 22)|
+ ((mtime_t)(hdr[11]&0xfe) << 14)|
+ (mtime_t)(hdr[12] << 7)|
+ (mtime_t)(hdr[12] >> 1);
+
+ if( hdr[7]&0x40 ) /* has dts */
+ {
+ i_dts = ((mtime_t)(hdr[14]&0x0e ) << 29)|
+ (mtime_t)(hdr[15] << 22)|
+ ((mtime_t)(hdr[16]&0xfe) << 14)|
+ (mtime_t)(hdr[17] << 7)|
+ (mtime_t)(hdr[18] >> 1);
+ }
+ }
+
+ p_pes = block_ChainGather( p_pes );
+ if( p_pes->i_buffer <= i_skip )
+ {
+ block_ChainRelease( p_pes );
+ return;
+ }
+
+ p_pes->i_buffer -= i_skip;
+ p_pes->p_buffer += i_skip;
+
+ if( i_dts >= 0 ) p_pes->i_dts = i_dts * 100 / 9;
+ if( i_pts >= 0 ) p_pes->i_pts = i_pts * 100 / 9;
+
+ /* Set PCR */
+ if( p_pes->i_pts > 0 )
+ {
+ es_out_Control( p_demux->out, ES_OUT_SET_PCR, (int64_t)p_pes->i_pts);
+ p_sys->b_pcr_audio = VLC_TRUE;
+ }
+ es_out_Send( p_demux->out, p_sys->p_audio, p_pes );
+}
+
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