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/*****************************************************************************
* spu_decoder.c : spu decoder thread
*****************************************************************************
* Copyright (C) 2000 VideoLAN
*
* Authors:
*
* 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.
*****************************************************************************/
/* repomp sur video_decoder.c
* FIXME: passer en terminate/destroy avec les signaux supplmentaires ?? */
/*****************************************************************************
* Preamble
*****************************************************************************/
#include "defs.h"
#include <stdlib.h> /* malloc(), free() */
#include <sys/types.h> /* on BSD, uio.h needs types.h */
#include <sys/uio.h> /* for input.h */
#include <unistd.h> /* getpid() */
#include "config.h"
#include "common.h"
#include "threads.h"
#include "mtime.h"
#include "plugins.h"
#include "intf_msg.h"
#include "debug.h" /* ASSERT */
#include "input.h"
#include "input_netlist.h"
#include "decoder_fifo.h"
#include "video.h"
#include "video_output.h"
#include "spu_decoder.h"
/*
* Local prototypes
*/
static int InitThread ( spudec_thread_t *p_spudec );
static void RunThread ( spudec_thread_t *p_spudec );
static void ErrorThread ( spudec_thread_t *p_spudec );
static void EndThread ( spudec_thread_t *p_spudec );
#define GetWord( i ) \
i = GetByte( &p_spudec->bit_stream ) << 8; \
i += GetByte( &p_spudec->bit_stream ); \
i_index += 2;
/*****************************************************************************
* spudec_CreateThread: create a spu decoder thread
*****************************************************************************/
spudec_thread_t * spudec_CreateThread( input_thread_t * p_input )
{
spudec_thread_t * p_spudec;
intf_DbgMsg("spudec debug: creating spu decoder thread\n");
/* Allocate the memory needed to store the thread's structure */
if ( (p_spudec = (spudec_thread_t *)malloc( sizeof(spudec_thread_t) )) == NULL )
{
intf_ErrMsg("spudec error: not enough memory for spudec_CreateThread() to create the new thread\n");
return( NULL );
}
/*
* Initialize the thread properties
*/
p_spudec->b_die = 0;
p_spudec->b_error = 0;
/*
* Initialize the input properties
*/
/* Initialize the decoder fifo's data lock and conditional variable and set
* its buffer as empty */
vlc_mutex_init( &p_spudec->fifo.data_lock );
vlc_cond_init( &p_spudec->fifo.data_wait );
p_spudec->fifo.i_start = 0;
p_spudec->fifo.i_end = 0;
/* Initialize the bit stream structure */
p_spudec->bit_stream.p_input = p_input;
p_spudec->bit_stream.p_decoder_fifo = &p_spudec->fifo;
p_spudec->bit_stream.fifo.buffer = 0;
p_spudec->bit_stream.fifo.i_available = 0;
/* Get the video output informations */
p_spudec->p_vout = p_input->p_vout;
/* Spawn the spu decoder thread */
if ( vlc_thread_create(&p_spudec->thread_id, "spu decoder",
(vlc_thread_func_t)RunThread, (void *)p_spudec) )
{
intf_ErrMsg("spudec error: can't spawn spu decoder thread\n");
free( p_spudec );
return( NULL );
}
intf_DbgMsg("spudec debug: spu decoder thread (%p) created\n", p_spudec);
return( p_spudec );
}
/*****************************************************************************
* spudec_DestroyThread: destroy a spu decoder thread
*****************************************************************************
* Destroy and terminate thread. This function will return 0 if the thread could
* be destroyed, and non 0 else. The last case probably means that the thread
* was still active, and another try may succeed.
*****************************************************************************/
void spudec_DestroyThread( spudec_thread_t *p_spudec )
{
intf_DbgMsg( "spudec debug: requesting termination of "
"spu decoder thread %p\n", p_spudec);
/* Ask thread to kill itself */
p_spudec->b_die = 1;
/* Warn the decoder that we're quitting */
vlc_mutex_lock( &p_spudec->fifo.data_lock );
vlc_cond_signal( &p_spudec->fifo.data_wait );
vlc_mutex_unlock( &p_spudec->fifo.data_lock );
/* Waiting for the decoder thread to exit */
/* Remove this as soon as the "status" flag is implemented */
vlc_thread_join( p_spudec->thread_id );
}
/* following functions are local */
/*****************************************************************************
* InitThread: initialize spu decoder thread
*****************************************************************************
* This function is called from RunThread and performs the second step of the
* initialization. It returns 0 on success. Note that the thread's flag are not
* modified inside this function.
*****************************************************************************/
static int InitThread( spudec_thread_t *p_spudec )
{
intf_DbgMsg("spudec debug: initializing spu decoder thread %p\n", p_spudec);
/* Our first job is to initialize the bit stream structure with the
* beginning of the input stream */
vlc_mutex_lock( &p_spudec->fifo.data_lock );
while ( DECODER_FIFO_ISEMPTY(p_spudec->fifo) )
{
if ( p_spudec->b_die )
{
vlc_mutex_unlock( &p_spudec->fifo.data_lock );
return( 1 );
}
vlc_cond_wait( &p_spudec->fifo.data_wait, &p_spudec->fifo.data_lock );
}
p_spudec->bit_stream.p_ts = DECODER_FIFO_START( p_spudec->fifo )->p_first_ts;
p_spudec->bit_stream.p_byte = p_spudec->bit_stream.p_ts->buffer + p_spudec->bit_stream.p_ts->i_payload_start;
p_spudec->bit_stream.p_end = p_spudec->bit_stream.p_ts->buffer + p_spudec->bit_stream.p_ts->i_payload_end;
vlc_mutex_unlock( &p_spudec->fifo.data_lock );
/* Mark thread as running and return */
intf_DbgMsg( "spudec debug: InitThread(%p) succeeded\n", p_spudec );
return( 0 );
}
/*****************************************************************************
* RunThread: spu decoder thread
*****************************************************************************
* spu decoder thread. This function only returns when the thread is
* terminated.
*****************************************************************************/
static void RunThread( spudec_thread_t *p_spudec )
{
intf_DbgMsg("spudec debug: running spu decoder thread (%p) (pid == %i)\n",
p_spudec, getpid());
/*
* Initialize thread and free configuration
*/
p_spudec->b_error = InitThread( p_spudec );
p_spudec->b_run = 1;
/*
* Main loop - it is not executed if an error occured during
* initialization
*/
while( (!p_spudec->b_die) && (!p_spudec->b_error) )
{
int i_packet_size;
int i_rle_size;
int i_index;
int i_pes_size;
int i_pes_count;
boolean_t b_finished;
unsigned char * p_spu_data;
subpicture_t * p_spu = NULL;
while( !DECODER_FIFO_ISEMPTY(p_spudec->fifo) )
{
/* wait for the next SPU ID.
* XXX: We trash 0xff bytes since they probably come from
* an incomplete previous packet */
do
{
i_packet_size = GetByte( &p_spudec->bit_stream );
}
while( i_packet_size == 0xff );
if( p_spudec->b_die )
break;
/* the total size - should equal the sum of the
* PES packet size that form the SPU packet */
i_packet_size = ( i_packet_size << 8 )
+ GetByte( &p_spudec->bit_stream );
i_index = 2;
/* get the useful PES size (real size - 10) */
i_pes_size = DECODER_FIFO_START(p_spudec->fifo)->i_pes_size - 9;
i_pes_count = 1;
/* the RLE stuff size */
GetWord( i_rle_size );
/* if the values we got aren't too strange, decode the data */
if( i_rle_size < i_packet_size )
{
/* allocate the subpicture.
* FIXME: we should check if the allocation failed */
p_spu = vout_CreateSubPicture( p_spudec->p_vout,
DVD_SUBPICTURE, i_rle_size );
p_spu_data = p_spu->p_data;
/* get display time */
p_spu->begin_date = p_spu->end_date
= DECODER_FIFO_START(p_spudec->fifo)->i_pts;
/* getting the RLE part */
while( i_index++ < i_rle_size )
{
/* skip the leading byte of a PES */
/* FIXME: this part definitely looks strange */
if ( !((i_index + 3) % i_pes_size) )
{
i_pes_count++;
}
*p_spu_data++ = GetByte( &p_spudec->bit_stream );
}
/* getting the control part */
b_finished = 0;
do
{
unsigned char i_cmd;
unsigned int i_word;
unsigned int i_date;
/* the date */
GetWord( i_date );
/* next offset, no next offset if == i_index-5 */
GetWord( i_word );
b_finished = ( i_index - 5 >= i_word );
do
{
i_cmd = GetByte( &p_spudec->bit_stream );
i_index++;
switch( i_cmd )
{
case SPU_CMD_FORCE_DISPLAY:
/* 00 (force displaying) */
break;
/* FIXME: here we have to calculate dates. It's
* around i_date * 12000 but I don't know
* how much exactly.
*/
case SPU_CMD_START_DISPLAY:
/* 01 (start displaying) */
p_spu->begin_date += ( i_date * 12000 );
break;
case SPU_CMD_STOP_DISPLAY:
/* 02 (stop displaying) */
p_spu->end_date += ( i_date * 12000 );
break;
case SPU_CMD_SET_PALETTE:
/* 03xxxx (palette) */
GetWord( i_word );
break;
case SPU_CMD_SET_ALPHACHANNEL:
/* 04xxxx (alpha channel) */
GetWord( i_word );
break;
case SPU_CMD_SET_COORDINATES:
/* 05xxxyyyxxxyyy (coordinates) */
i_word = GetByte( &p_spudec->bit_stream );
p_spu->i_x = (i_word << 4)
| GetBits( &p_spudec->bit_stream, 4 );
i_word = GetBits( &p_spudec->bit_stream, 4 );
p_spu->i_width = p_spu->i_x - ( (i_word << 8)
| GetByte( &p_spudec->bit_stream ) ) + 1;
i_word = GetByte( &p_spudec->bit_stream );
p_spu->i_y = (i_word << 4)
| GetBits( &p_spudec->bit_stream, 4 );
i_word = GetBits( &p_spudec->bit_stream, 4 );
p_spu->i_height = p_spu->i_y - ( (i_word << 8)
| GetByte( &p_spudec->bit_stream ) ) + 1;
i_index += 6;
break;
case SPU_CMD_SET_OFFSETS:
/* 06xxxxyyyy (byte offsets) */
GetWord( i_word );
p_spu->type.spu.i_offset[0] = i_word - 4;
GetWord( i_word );
p_spu->type.spu.i_offset[1] = i_word - 4;
break;
case SPU_CMD_END:
/* ff (end) */
break;
default:
/* ?? (unknown command) */
intf_ErrMsg( "spudec: unknown command 0x%.2x\n",
i_cmd );
break;
}
}
while( i_cmd != SPU_CMD_END );
}
while( !b_finished );
/* SPU is finished - we can tell the video output
* to display it */
vout_DisplaySubPicture( p_spudec->p_vout, p_spu );
}
else
{
/* Unexpected PES packet - trash it */
intf_ErrMsg( "spudec: trying to recover from bad packet\n" );
vlc_mutex_lock( &p_spudec->fifo.data_lock );
input_NetlistFreePES( p_spudec->bit_stream.p_input,
DECODER_FIFO_START(p_spudec->fifo) );
DECODER_FIFO_INCSTART( p_spudec->fifo );
vlc_mutex_unlock( &p_spudec->fifo.data_lock );
}
}
}
/*
* Error loop
*/
if( p_spudec->b_error )
{
ErrorThread( p_spudec );
}
p_spudec->b_run = 0;
/* End of thread */
EndThread( p_spudec );
}
/*****************************************************************************
* ErrorThread: RunThread() error loop
*****************************************************************************
* This function is called when an error occured during thread main's loop. The
* thread can still receive feed, but must be ready to terminate as soon as
* possible.
*****************************************************************************/
static void ErrorThread( spudec_thread_t *p_spudec )
{
/* We take the lock, because we are going to read/write the start/end
* indexes of the decoder fifo */
vlc_mutex_lock( &p_spudec->fifo.data_lock );
/* Wait until a `die' order is sent */
while( !p_spudec->b_die )
{
/* Trash all received PES packets */
while( !DECODER_FIFO_ISEMPTY(p_spudec->fifo) )
{
input_NetlistFreePES( p_spudec->bit_stream.p_input, DECODER_FIFO_START(p_spudec->fifo) );
DECODER_FIFO_INCSTART( p_spudec->fifo );
}
/* Waiting for the input thread to put new PES packets in the fifo */
vlc_cond_wait( &p_spudec->fifo.data_wait, &p_spudec->fifo.data_lock );
}
/* We can release the lock before leaving */
vlc_mutex_unlock( &p_spudec->fifo.data_lock );
}
/*****************************************************************************
* EndThread: thread destruction
*****************************************************************************
* This function is called when the thread ends after a sucessful
* initialization.
*****************************************************************************/
static void EndThread( spudec_thread_t *p_spudec )
{
intf_DbgMsg( "spudec debug: destroying spu decoder thread %p\n", p_spudec );
free( p_spudec );
intf_DbgMsg( "spudec debug: spu decoder thread %p destroyed\n", p_spudec);
}