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Commit 4d50b304 authored by Laurent Aimar's avatar Laurent Aimar
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* input_ext-dec.c: useless file.

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/*****************************************************************************
* input_ext-dec.c: services to the decoders
*****************************************************************************
* Copyright (C) 1998-2001 VideoLAN
* $Id: input_ext-dec.c,v 1.46 2003/08/17 20:39:08 fenrir Exp $
*
* Authors: Christophe Massiot <massiot@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 <string.h> /* memcpy(), memset() */
#include <vlc/vlc.h>
#include "stream_control.h"
#include "input_ext-dec.h"
#include "input_ext-intf.h"
#include "input_ext-plugins.h"
/****************************************************************************
* input_ExtractPES
*****************************************************************************
* Extract a PES from the fifo. If pp_pes is NULL then the PES is just
* deleted, otherwise *pp_pes will point to this PES.
****************************************************************************/
void input_ExtractPES( decoder_fifo_t *p_fifo, pes_packet_t **pp_pes )
{
pes_packet_t *p_pes;
vlc_mutex_lock( &p_fifo->data_lock );
if( p_fifo->p_first == NULL )
{
if( p_fifo->b_die )
{
vlc_mutex_unlock( &p_fifo->data_lock );
if( pp_pes ) *pp_pes = NULL;
return;
}
/* Signal the input thread we're waiting. This is only
* needed in case of slave clock (ES plug-in) but it won't
* harm. */
vlc_cond_signal( &p_fifo->data_wait );
/* Wait for the input to tell us when we received a packet. */
vlc_cond_wait( &p_fifo->data_wait, &p_fifo->data_lock );
}
p_pes = p_fifo->p_first;
p_fifo->p_first = p_pes->p_next;
p_pes->p_next = NULL;
p_fifo->i_depth--;
if( !p_fifo->p_first )
{
/* No PES in the FIFO. p_last is no longer valid. */
p_fifo->pp_last = &p_fifo->p_first;
}
vlc_mutex_unlock( &p_fifo->data_lock );
if( pp_pes )
*pp_pes = p_pes;
else
input_DeletePES( p_fifo->p_packets_mgt, p_pes );
}
/*****************************************************************************
* InitBitstream: initialize a bit_stream_t structure and returns VLC_SUCCESS
* on success.
*****************************************************************************/
int InitBitstream( bit_stream_t * p_bit_stream, decoder_fifo_t * p_fifo,
void (* pf_bitstream_callback)( bit_stream_t *, vlc_bool_t ),
void * p_callback_arg )
{
/* Get the first pes packet */
input_ExtractPES( p_fifo, &p_bit_stream->p_pes );
if( !p_bit_stream->p_pes )
return VLC_EGENERIC;
p_bit_stream->p_decoder_fifo = p_fifo;
p_bit_stream->pf_bitstream_callback = pf_bitstream_callback;
p_bit_stream->p_callback_arg = p_callback_arg;
p_bit_stream->p_data = p_bit_stream->p_pes->p_first;
p_bit_stream->p_byte = p_bit_stream->p_data->p_payload_start;
p_bit_stream->p_end = p_bit_stream->p_data->p_payload_end;
p_bit_stream->fifo.buffer = 0;
p_bit_stream->fifo.i_available = 0;
p_bit_stream->i_pts = p_bit_stream->p_pes->i_pts;
p_bit_stream->i_dts = p_bit_stream->p_pes->i_dts;
p_bit_stream->p_pts_validity = p_bit_stream->p_byte;
/* Call back the decoder. */
if( p_bit_stream->pf_bitstream_callback != NULL )
{
p_bit_stream->pf_bitstream_callback( p_bit_stream, 1 );
}
if( p_bit_stream->p_byte <= p_bit_stream->p_end - sizeof(WORD_TYPE) )
{
/* Get aligned on a word boundary.
* NB : we _will_ get aligned, because we have at most
* sizeof(WORD_TYPE) - 1 bytes to store, and at least
* sizeof(WORD_TYPE) - 1 empty bytes in the bit buffer. */
AlignWord( p_bit_stream );
}
return VLC_SUCCESS;
}
/*****************************************************************************
* CloseBitstream: free the bitstream structure.
*****************************************************************************/
void CloseBitstream( bit_stream_t * p_bit_stream )
{
if( p_bit_stream->p_pes )
input_DeletePES( p_bit_stream->p_decoder_fifo->p_packets_mgt,
p_bit_stream->p_pes );
}
/*****************************************************************************
* DecoderError : an error occured, use this function to empty the fifo
*****************************************************************************/
void DecoderError( decoder_fifo_t * p_fifo )
{
/* No need to take the lock, because input_ExtractPES already takes it
* and also check for p_fifo->b_die */
/* Wait until a `die' order is sent */
while( !p_fifo->b_die )
{
/* Trash all received PES packets */
input_ExtractPES( p_fifo, NULL );
}
}
/*****************************************************************************
* NextDataPacket: go to the data packet after *pp_data, return 1 if we
* changed PES. This function can fail in case of end of stream, you can
* check p_bit_stream->p_data or p_bit_stream->p_pes to know wether we did get
* the next data packet.
*****************************************************************************/
static inline vlc_bool_t _NextDataPacket( decoder_fifo_t * p_fifo,
bit_stream_t * p_bit_stream )
{
vlc_bool_t b_new_pes;
/* We are looking for the next data packet that contains real data,
* and not just a PES header */
do
{
/* Sanity check. Yes, this can happen if the caller doesn't check
* for p_fifo->b_die beforehand. */
if( p_bit_stream->p_pes == NULL ) return 0;
/* We were reading the last data packet of this PES packet... It's
* time to jump to the next PES packet */
if( p_bit_stream->p_data->p_next == NULL )
{
/* The next packet could be found in the next PES packet */
input_DeletePES( p_fifo->p_packets_mgt, p_bit_stream->p_pes );
input_ExtractPES( p_fifo, &p_bit_stream->p_pes );
if( !p_bit_stream->p_pes )
{
/* Couldn't get the next PES, might be an eos */
p_bit_stream->p_data = NULL;
return 0;
}
p_bit_stream->p_data = p_bit_stream->p_pes->p_first;
b_new_pes = 1;
}
else
{
/* Perhaps the next data packet of the current PES packet contains
* real data (ie its payload's size is greater than 0). */
p_bit_stream->p_data = p_bit_stream->p_data->p_next;
b_new_pes = 0;
}
} while ( p_bit_stream->p_data->p_payload_start ==
p_bit_stream->p_data->p_payload_end );
return( b_new_pes );
}
vlc_bool_t NextDataPacket( decoder_fifo_t * p_fifo,
bit_stream_t * p_bit_stream )
{
return( _NextDataPacket( p_fifo, p_bit_stream ) );
}
/*****************************************************************************
* BitstreamNextDataPacket: go to the next data packet, and update bitstream
* context. This function can fail in case of eos!
*****************************************************************************/
static inline void _BitstreamNextDataPacket( bit_stream_t * p_bit_stream )
{
decoder_fifo_t * p_fifo = p_bit_stream->p_decoder_fifo;
vlc_bool_t b_new_pes;
b_new_pes = _NextDataPacket( p_fifo, p_bit_stream );
if( !p_bit_stream->p_pes ) return;
/* We've found a data packet which contains interesting data... */
p_bit_stream->p_byte = p_bit_stream->p_data->p_payload_start;
p_bit_stream->p_end = p_bit_stream->p_data->p_payload_end;
/* Call back the decoder. */
if( p_bit_stream->pf_bitstream_callback != NULL )
{
p_bit_stream->pf_bitstream_callback( p_bit_stream, b_new_pes );
}
/* Discontinuity management. */
if( p_bit_stream->p_data->b_discard_payload )
{
p_bit_stream->i_pts = p_bit_stream->i_dts = 0;
}
/* Retrieve the PTS. */
if( b_new_pes && p_bit_stream->p_pes->i_pts )
{
p_bit_stream->i_pts = p_bit_stream->p_pes->i_pts;
p_bit_stream->i_dts = p_bit_stream->p_pes->i_dts;
p_bit_stream->p_pts_validity = p_bit_stream->p_byte;
}
}
void BitstreamNextDataPacket( bit_stream_t * p_bit_stream )
{
_BitstreamNextDataPacket( p_bit_stream );
}
/*****************************************************************************
* UnalignedShowBits : places i_bits bits into the bit buffer, even when
* not aligned on a word boundary
*****************************************************************************/
uint32_t UnalignedShowBits( bit_stream_t * p_bit_stream, unsigned int i_bits )
{
/* We just fill in the bit buffer. */
while( (unsigned int)p_bit_stream->fifo.i_available < i_bits )
{
if( p_bit_stream->p_byte < p_bit_stream->p_end )
{
p_bit_stream->fifo.buffer |= *(p_bit_stream->p_byte++)
<< (8 * sizeof(WORD_TYPE) - 8
- p_bit_stream->fifo.i_available);
p_bit_stream->fifo.i_available += 8;
}
else
{
_BitstreamNextDataPacket( p_bit_stream );
if( p_bit_stream->p_decoder_fifo->b_die ) return 0;
if( (ptrdiff_t)p_bit_stream->p_byte & (sizeof(WORD_TYPE) - 1) )
{
/* We are not aligned anymore. */
if( ((ptrdiff_t)p_bit_stream->p_byte
& (sizeof(WORD_TYPE) - 1)) * 8
< (unsigned int)p_bit_stream->fifo.i_available )
{
/* We are not aligned, and won't be. Copy the first word
* of the packet in a temporary buffer, and we'll see
* later. */
int i;
/* sizeof(WORD_TYPE) - number of bytes to trash
* from the last payload */
int j;
p_bit_stream->i_showbits_buffer = 0;
for( j = i = 0 ; i < (int)sizeof(WORD_TYPE) ; i++ )
{
if( p_bit_stream->p_byte >= p_bit_stream->p_end )
{
j = i;
_BitstreamNextDataPacket( p_bit_stream );
if( p_bit_stream->p_decoder_fifo->b_die ) return 0;
}
((byte_t *)&p_bit_stream->i_showbits_buffer)[i] =
* p_bit_stream->p_byte;
p_bit_stream->p_byte++;
}
/* This is kind of kludgy. */
p_bit_stream->p_data->p_payload_start +=
sizeof(WORD_TYPE) - j;
p_bit_stream->p_byte =
(byte_t *)&p_bit_stream->i_showbits_buffer;
p_bit_stream->p_end =
(byte_t *)&p_bit_stream->i_showbits_buffer
+ sizeof(WORD_TYPE);
p_bit_stream->showbits_data.p_next = p_bit_stream->p_data;
p_bit_stream->p_data = &p_bit_stream->showbits_data;
}
else
{
/* We are not aligned, but we can be. */
AlignWord( p_bit_stream );
}
}
/* We have 32 bits ready for reading, it will be enough. */
break;
}
}
/* It shouldn't loop :-)) */
return( ShowBits( p_bit_stream, i_bits ) );
}
/*****************************************************************************
* UnalignedGetBits : returns i_bits bits from the bit stream and removes
* them from the buffer, even when the bit stream is not aligned on a word
* boundary
*****************************************************************************/
uint32_t UnalignedGetBits( bit_stream_t * p_bit_stream, unsigned int i_bits )
{
uint32_t i_result;
i_result = p_bit_stream->fifo.buffer
>> (8 * sizeof(WORD_TYPE) - i_bits);
i_bits = -p_bit_stream->fifo.i_available;
/* Gather missing bytes. */
while( i_bits >= 8 )
{
if( p_bit_stream->p_byte < p_bit_stream->p_end )
{
i_result |= *(p_bit_stream->p_byte++) << (i_bits - 8);
i_bits -= 8;
}
else
{
_BitstreamNextDataPacket( p_bit_stream );
if( p_bit_stream->p_decoder_fifo->b_die ) return 0;
i_result |= *(p_bit_stream->p_byte++) << (i_bits - 8);
i_bits -= 8;
}
}
/* Gather missing bits. */
if( i_bits > 0 )
{
unsigned int i_tmp = 8 - i_bits;
if( p_bit_stream->p_byte < p_bit_stream->p_end )
{
i_result |= *p_bit_stream->p_byte >> i_tmp;
p_bit_stream->fifo.buffer = *(p_bit_stream->p_byte++)
<< ( sizeof(WORD_TYPE) * 8 - i_tmp );
p_bit_stream->fifo.i_available = i_tmp;
}
else
{
_BitstreamNextDataPacket( p_bit_stream );
if( p_bit_stream->p_decoder_fifo->b_die ) return 0;
i_result |= *p_bit_stream->p_byte >> i_tmp;
p_bit_stream->fifo.buffer = *(p_bit_stream->p_byte++)
<< ( sizeof(WORD_TYPE) * 8 - i_tmp );
p_bit_stream->fifo.i_available = i_tmp;
}
}
else
{
p_bit_stream->fifo.i_available = 0;
p_bit_stream->fifo.buffer = 0;
}
if( p_bit_stream->p_byte <= p_bit_stream->p_end - sizeof(WORD_TYPE) )
{
/* Get aligned on a word boundary. Otherwise it is safer
* to do it the next time.
* NB : we _will_ get aligned, because we have at most
* sizeof(WORD_TYPE) - 1 bytes to store, and at least
* sizeof(WORD_TYPE) - 1 empty bytes in the bit buffer. */
AlignWord( p_bit_stream );
}
return( i_result );
}
/*****************************************************************************
* UnalignedRemoveBits : removes i_bits (== -i_available) from the bit
* buffer, even when the bit stream is not aligned on a word boundary
*****************************************************************************/
void UnalignedRemoveBits( bit_stream_t * p_bit_stream )
{
/* First remove all unnecessary bytes. */
while( p_bit_stream->fifo.i_available <= -8 )
{
if( p_bit_stream->p_byte < p_bit_stream->p_end )
{
p_bit_stream->p_byte++;
p_bit_stream->fifo.i_available += 8;
}
else
{
_BitstreamNextDataPacket( p_bit_stream );
if( p_bit_stream->p_decoder_fifo->b_die ) return;
p_bit_stream->p_byte++;
p_bit_stream->fifo.i_available += 8;
}
}
/* Remove unnecessary bits. */
if( p_bit_stream->fifo.i_available < 0 )
{
if( p_bit_stream->p_byte < p_bit_stream->p_end )
{
p_bit_stream->fifo.buffer = *(p_bit_stream->p_byte++)
<< ( sizeof(WORD_TYPE) * 8 - 8
- p_bit_stream->fifo.i_available );
p_bit_stream->fifo.i_available += 8;
}
else
{
_BitstreamNextDataPacket( p_bit_stream );
if( p_bit_stream->p_decoder_fifo->b_die ) return;
p_bit_stream->fifo.buffer = *(p_bit_stream->p_byte++)
<< ( sizeof(WORD_TYPE) * 8 - 8
- p_bit_stream->fifo.i_available );
p_bit_stream->fifo.i_available += 8;
}
}
else
{
p_bit_stream->fifo.buffer = 0;
}
if( p_bit_stream->p_byte <= p_bit_stream->p_end - sizeof(WORD_TYPE) )
{
/* Get aligned on a word boundary. Otherwise it is safer
* to do it the next time.
* NB : we _will_ get aligned, because we have at most
* sizeof(WORD_TYPE) - 1 bytes to store, and at least
* sizeof(WORD_TYPE) - 1 empty bytes in the bit buffer. */
AlignWord( p_bit_stream );
}
}
/*****************************************************************************
* CurrentPTS: returns the current PTS and DTS
*****************************************************************************/
void CurrentPTS( bit_stream_t * p_bit_stream, mtime_t * pi_pts,
mtime_t * pi_dts )
{
/* Check if the current PTS is already valid (ie. if the first byte
* of the packet has already been used in the decoder). */
ptrdiff_t p_diff = p_bit_stream->p_pts_validity - p_bit_stream->p_byte;
if( p_diff < 0 || p_diff > 4 /* We are far away so it is valid */
|| (p_diff * 8) >= p_bit_stream->fifo.i_available
/* We have buffered less bytes than actually read */ )
{
*pi_pts = p_bit_stream->i_pts;
if( pi_dts != NULL ) *pi_dts = p_bit_stream->i_dts;
p_bit_stream->i_pts = 0;
p_bit_stream->i_dts = 0;
}
else
{
*pi_pts = 0;
if( pi_dts != NULL) *pi_dts = 0;
}
}
/*****************************************************************************
* NextPTS: returns the PTS and DTS for the next starting byte
*****************************************************************************/
void NextPTS( bit_stream_t * p_bit_stream, mtime_t * pi_pts,
mtime_t * pi_dts )
{
/* Check if the current PTS is already valid (ie. if the first byte
* of the packet has already been used in the decoder). */
ptrdiff_t p_diff = p_bit_stream->p_pts_validity - p_bit_stream->p_byte - 1;
if( p_diff < 0 || p_diff > 4 /* We are far away so it is valid */
|| (p_diff * 8) >= p_bit_stream->fifo.i_available
/* We have buffered less bytes than actually read */ )
{
*pi_pts = p_bit_stream->i_pts;
if( pi_dts != NULL ) *pi_dts = p_bit_stream->i_dts;
p_bit_stream->i_pts = 0;
p_bit_stream->i_dts = 0;
}
else
{
*pi_pts = 0;
if( pi_dts != NULL) *pi_dts = 0;
}
}
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