/*****************************************************************************
* input_ext-dec.c: services to the decoders
*****************************************************************************
- * Copyright (C) 1998, 1999, 2000 VideoLAN
+ * Copyright (C) 1998-2001 VideoLAN
+ * $Id: input_ext-dec.c,v 1.45 2003/03/04 13:21:19 massiot Exp $
*
- * Authors:
+ * 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
/*****************************************************************************
* Preamble
*****************************************************************************/
-#include "defs.h"
+#include <string.h> /* memcpy(), memset() */
-#include "config.h"
-#include "common.h"
-#include "threads.h"
-#include "mtime.h"
-
-#include "intf_msg.h"
+#include <vlc/vlc.h>
#include "stream_control.h"
#include "input_ext-dec.h"
#include "input_ext-intf.h"
+#include "input_ext-plugins.h"
-#include "input.h"
-
-/*****************************************************************************
- * InitBitstream: initialize a bit_stream_t structure
- *****************************************************************************/
-void InitBitstream( bit_stream_t * p_bit_stream, decoder_fifo_t * p_fifo )
+/****************************************************************************
+ * 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 )
{
- p_bit_stream->p_decoder_fifo = p_fifo;
- p_bit_stream->pf_next_data_packet = NextDataPacket;
- p_bit_stream->pf_bitstream_callback = NULL;
- p_bit_stream->p_callback_arg = NULL;
+ pes_packet_t *p_pes;
- /* Get the first data packet. */
vlc_mutex_lock( &p_fifo->data_lock );
- while ( DECODER_FIFO_ISEMPTY( *p_fifo ) )
+
+ if( p_fifo->p_first == NULL )
{
- if ( p_fifo->b_die )
+ 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_bit_stream->p_data = DECODER_FIFO_START( *p_fifo )->p_first;
+
+ 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;
- vlc_mutex_unlock( &p_fifo->data_lock );
+ 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;
}
/*****************************************************************************
- * NextDataPacket: go to the next data packet
+ * CloseBitstream: free the bitstream structure.
*****************************************************************************/
-void NextDataPacket( bit_stream_t * p_bit_stream )
+void CloseBitstream( bit_stream_t * p_bit_stream )
{
- WORD_TYPE buffer_left;
- ptrdiff_t i_bytes_left;
- decoder_fifo_t * p_fifo = p_bit_stream->p_decoder_fifo;
- boolean_t b_new_pes;
+ 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 );
+ }
+}
- /* Put the remaining bytes (not aligned on a word boundary) in a
- * temporary buffer. */
- i_bytes_left = p_bit_stream->p_end - p_bit_stream->p_byte;
- buffer_left = *((WORD_TYPE *)p_bit_stream->p_end - 1);
+/*****************************************************************************
+ * 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 )
{
- /* We are going to read/write the start and end indexes of the
- * decoder fifo and to use the fifo's conditional variable,
- * that's why we need to take the lock before. */
- vlc_mutex_lock( &p_fifo->data_lock );
-
- /* Free the previous PES packet. */
- p_fifo->pf_delete_pes( p_fifo->p_packets_mgt,
- DECODER_FIFO_START( *p_fifo ) );
- DECODER_FIFO_INCSTART( *p_fifo );
-
- if( DECODER_FIFO_ISEMPTY( *p_fifo ) )
+ /* 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 )
{
- /* Wait for the input to tell us when we receive a packet. */
- vlc_cond_wait( &p_fifo->data_wait, &p_fifo->data_lock );
- }
-
- /* The next byte could be found in the next PES packet */
- p_bit_stream->p_data = DECODER_FIFO_START( *p_fifo )->p_first;
-
- vlc_mutex_unlock( &p_fifo->data_lock );
-
+ /* 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
b_new_pes = 0;
}
- } while ( p_bit_stream->p_data->p_payload_start
- == p_bit_stream->p_data->p_payload_end );
+ } 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->pf_bitstream_callback( p_bit_stream, b_new_pes );
}
- /* Copy remaining bits of the previous packet */
- *((WORD_TYPE *)p_bit_stream->p_byte - 1) = buffer_left;
- p_bit_stream->p_byte -= i_bytes_left;
+ /* 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
+ *****************************************************************************/
+u32 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
+ *****************************************************************************/
+u32 UnalignedGetBits( bit_stream_t * p_bit_stream, unsigned int i_bits )
+{
+ u32 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;
+ }
}
projects / vlc / blobdiff