X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=include%2Finput_ext-dec.h;h=e2acfa587818a7da82d3bed8536006186836a1d4;hb=0ce68cce73ff641488667f664b5f9e296001a6a6;hp=da3ba0f7c7819fe89fd88876a600d45d0c35b6a0;hpb=6d6601ea132822dfb9a172b70dbca6969f229185;p=vlc diff --git a/include/input_ext-dec.h b/include/input_ext-dec.h index da3ba0f7c7..e2acfa5878 100644 --- a/include/input_ext-dec.h +++ b/include/input_ext-dec.h @@ -2,7 +2,7 @@ * input_ext-dec.h: structures exported to the VideoLAN decoders ***************************************************************************** * Copyright (C) 1999-2001 VideoLAN - * $Id: input_ext-dec.h,v 1.75 2002/10/27 16:58:14 gbazin Exp $ + * $Id: input_ext-dec.h,v 1.83 2003/11/24 00:39:00 fenrir Exp $ * * Authors: Christophe Massiot * Michel Kaempf @@ -80,450 +80,9 @@ struct pes_packet_t unsigned int i_nb_data; /* Number of data packets in the chained list */ }; -/***************************************************************************** - * decoder_fifo_t - ***************************************************************************** - * This rotative FIFO contains PES packets that are to be decoded. - *****************************************************************************/ -struct decoder_fifo_t -{ - VLC_COMMON_MEMBERS - - /* Thread structures */ - vlc_mutex_t data_lock; /* fifo data lock */ - vlc_cond_t data_wait; /* fifo data conditional variable */ - - /* Data */ - pes_packet_t * p_first; - pes_packet_t ** pp_last; - int i_depth; /* number of PES packets in the stack */ - - /* Communication interface between input and decoders */ - input_buffers_t *p_packets_mgt; /* packets management services data */ - - /* Standard pointers given to the decoders as a toolbox. */ - u16 i_id; - vlc_fourcc_t i_fourcc; - es_sys_t * p_demux_data; - stream_ctrl_t * p_stream_ctrl; - sout_instance_t * p_sout; - - /* Module properties */ - module_t * p_module; - int ( * pf_run ) ( decoder_fifo_t * ); -}; - -/***************************************************************************** - * bit_fifo_t : bit fifo descriptor - ***************************************************************************** - * This type describes a bit fifo used to store bits while working with the - * input stream at the bit level. - *****************************************************************************/ -typedef u32 WORD_TYPE; - -typedef struct bit_fifo_t -{ - /* This unsigned integer allows us to work at the bit level. This buffer - * can contain 32 bits, and the used space can be found on the MSb's side - * and the available space on the LSb's side. */ - WORD_TYPE buffer; - - /* Number of bits available in the bit buffer */ - int i_available; - -} bit_fifo_t; - -/***************************************************************************** - * bit_stream_t : bit stream descriptor - ***************************************************************************** - * This type, based on a PES stream, includes all the structures needed to - * handle the input stream like a bit stream. - *****************************************************************************/ -struct bit_stream_t -{ - /* - * Bit structures - */ - bit_fifo_t fifo; - - /* - * Input structures - */ - /* The decoder fifo contains the data of the PES stream */ - decoder_fifo_t * p_decoder_fifo; - - /* Callback to the decoder used when changing data packets ; set - * to NULL if your decoder doesn't need it. */ - void (* pf_bitstream_callback)( bit_stream_t *, vlc_bool_t ); - /* Optional argument to the callback */ - void * p_callback_arg; - - /* - * PTS retrieval - */ - mtime_t i_pts, i_dts; - byte_t * p_pts_validity; - - /* - * Byte structures - */ - /* Current PES packet (extracted from the PES stream) */ - pes_packet_t * p_pes; - /* Current data packet (in the current PES packet) */ - data_packet_t * p_data; - /* Pointer to the next byte that is to be read (in the current packet) */ - byte_t * p_byte; - /* Pointer to the last byte that is to be read (in the current packet */ - byte_t * p_end; - /* Temporary buffer in case we're not aligned when changing data packets */ - WORD_TYPE i_showbits_buffer; - data_packet_t showbits_data; -}; - -/***************************************************************************** - * Inline functions used by the decoders to read bit_stream_t - *****************************************************************************/ - -/* - * DISCUSSION : How to use the bit_stream structures - * - * sizeof(WORD_TYPE) (usually 32) bits are read at the same time, thus - * minimizing the number of p_byte changes. - * Bits are read via GetBits() or ShowBits. - * - * XXX : Be aware that if, in the forthcoming functions, i_bits > 24, - * the data have to be already aligned on an 8-bit boundary, or wrong - * results will be returned. Use RealignBits() if unsure. - */ - -#if (WORD_TYPE == u32) -# define WORD_AT U32_AT -# define WORD_SIGNED s32 -#elif (WORD_TYPE == u64) -# define WORD_AT U64_AT -# define WORD_SIGNED s64 -#else -# error Unsupported WORD_TYPE -#endif - /***************************************************************************** * Prototypes from input_ext-dec.c *****************************************************************************/ -VLC_EXPORT( int, InitBitstream, ( bit_stream_t *, decoder_fifo_t *, void ( * )( bit_stream_t *, vlc_bool_t ), void * p_callback_arg ) ); -VLC_EXPORT( vlc_bool_t, NextDataPacket, ( decoder_fifo_t *, bit_stream_t * ) ); -VLC_EXPORT( void, BitstreamNextDataPacket, ( bit_stream_t * ) ); -VLC_EXPORT( u32, UnalignedShowBits, ( bit_stream_t *, unsigned int ) ); -VLC_EXPORT( void, UnalignedRemoveBits, ( bit_stream_t * ) ); -VLC_EXPORT( u32, UnalignedGetBits, ( bit_stream_t *, unsigned int ) ); -VLC_EXPORT( void, CloseBitstream, ( bit_stream_t * ) ); -VLC_EXPORT( void, CurrentPTS, ( bit_stream_t *, mtime_t *, mtime_t * ) ); -VLC_EXPORT( void, NextPTS, ( bit_stream_t *, mtime_t *, mtime_t * ) ); - -/***************************************************************************** - * AlignWord : fill in the bit buffer so that the byte pointer be aligned - * on a word boundary (XXX: there must be at least sizeof(WORD_TYPE) - 1 - * empty bytes in the bit buffer) - *****************************************************************************/ -static inline void AlignWord( bit_stream_t * p_bit_stream ) -{ - while( (ptrdiff_t)p_bit_stream->p_byte - & (sizeof(WORD_TYPE) - 1) ) - { - 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 ); - 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; - } - } -} - -/***************************************************************************** - * ShowBits : return i_bits bits from the bit stream - *****************************************************************************/ -static inline u32 ShowBits( bit_stream_t * p_bit_stream, unsigned int i_bits ) -{ - if( p_bit_stream->fifo.i_available >= i_bits ) - { - return( p_bit_stream->fifo.buffer >> (8 * sizeof(WORD_TYPE) - i_bits) ); - } - - if( p_bit_stream->p_byte <= p_bit_stream->p_end - sizeof(WORD_TYPE) ) - { - return( (p_bit_stream->fifo.buffer | - (WORD_AT( p_bit_stream->p_byte ) - >> p_bit_stream->fifo.i_available)) - >> (8 * sizeof(WORD_TYPE) - i_bits) ); - } - - return( UnalignedShowBits( p_bit_stream, i_bits ) ); -} - -/***************************************************************************** - * ShowSignedBits : return i_bits bits from the bit stream, using signed - * arithmetic - *****************************************************************************/ -static inline s32 ShowSignedBits( bit_stream_t * p_bit_stream, - unsigned int i_bits ) -{ - if( p_bit_stream->fifo.i_available >= i_bits ) - { - return( (WORD_SIGNED)p_bit_stream->fifo.buffer - >> (8 * sizeof(WORD_TYPE) - i_bits) ); - } - - /* You can probably do something a little faster, but now I'm tired. */ - return( (WORD_SIGNED)(ShowBits( p_bit_stream, i_bits ) << (32 - i_bits)) - >> (32 - i_bits) ); -} - -/***************************************************************************** - * RemoveBits : removes i_bits bits from the bit buffer - * XXX: do not use for 32 bits, see RemoveBits32 - *****************************************************************************/ -static inline void RemoveBits( bit_stream_t * p_bit_stream, - unsigned int i_bits ) -{ - p_bit_stream->fifo.i_available -= i_bits; - - if( p_bit_stream->fifo.i_available >= 0 ) - { - p_bit_stream->fifo.buffer <<= i_bits; - return; - } - - if( p_bit_stream->p_byte <= p_bit_stream->p_end - sizeof(WORD_TYPE) ) - { - p_bit_stream->fifo.buffer = WORD_AT( p_bit_stream->p_byte ) - << ( -p_bit_stream->fifo.i_available ); - p_bit_stream->p_byte = - (byte_t *) ( ((WORD_TYPE *)p_bit_stream->p_byte) + 1 ); - p_bit_stream->fifo.i_available += sizeof(WORD_TYPE) * 8; - return; - } - - UnalignedRemoveBits( p_bit_stream ); -} - -/***************************************************************************** - * RemoveBits32 : removes 32 bits from the bit buffer (and as a side effect, - * refill it) - *****************************************************************************/ -#if (WORD_TYPE == u32) -static inline void RemoveBits32( bit_stream_t * p_bit_stream ) -{ - if( p_bit_stream->p_byte <= p_bit_stream->p_end - sizeof(WORD_TYPE) ) - { - if( p_bit_stream->fifo.i_available ) - { - p_bit_stream->fifo.buffer = WORD_AT( p_bit_stream->p_byte ) - << (32 - p_bit_stream->fifo.i_available); - p_bit_stream->p_byte = - (byte_t *) ( ((WORD_TYPE *)p_bit_stream->p_byte) + 1 ); - return; - } - - p_bit_stream->p_byte = - (byte_t *) ( ((WORD_TYPE *)p_bit_stream->p_byte) + 1 ); - return; - } - - p_bit_stream->fifo.i_available -= 32; - UnalignedRemoveBits( p_bit_stream ); -} -#else -# define RemoveBits32( p_bit_stream ) RemoveBits( p_bit_stream, 32 ) -#endif - -/***************************************************************************** - * GetBits : returns i_bits bits from the bit stream and removes them - * XXX: do not use for 32 bits, see GetBits32 - *****************************************************************************/ -static inline u32 GetBits( bit_stream_t * p_bit_stream, unsigned int i_bits ) -{ - u32 i_result; - - p_bit_stream->fifo.i_available -= i_bits; - - if( p_bit_stream->fifo.i_available >= 0 ) - { - i_result = p_bit_stream->fifo.buffer - >> (8 * sizeof(WORD_TYPE) - i_bits); - p_bit_stream->fifo.buffer <<= i_bits; - return( i_result ); - } - - if( p_bit_stream->p_byte <= p_bit_stream->p_end - sizeof(WORD_TYPE) ) - { - i_result = p_bit_stream->fifo.buffer - >> (8 * sizeof(WORD_TYPE) - i_bits); - p_bit_stream->fifo.buffer = WORD_AT( p_bit_stream->p_byte ); - p_bit_stream->p_byte = - (byte_t *) ( ((WORD_TYPE *)p_bit_stream->p_byte) + 1 ); - i_result |= p_bit_stream->fifo.buffer - >> (8 * sizeof(WORD_TYPE) - + p_bit_stream->fifo.i_available); - p_bit_stream->fifo.buffer <<= ( -p_bit_stream->fifo.i_available ); - p_bit_stream->fifo.i_available += sizeof(WORD_TYPE) * 8; - return( i_result ); - } - - return UnalignedGetBits( p_bit_stream, i_bits ); -} - -/***************************************************************************** - * GetSignedBits : returns i_bits bits from the bit stream and removes them, - * using signed arithmetic - * XXX: do not use for 32 bits - *****************************************************************************/ -static inline s32 GetSignedBits( bit_stream_t * p_bit_stream, - unsigned int i_bits ) -{ - if( p_bit_stream->fifo.i_available >= i_bits ) - { - s32 i_result; - - p_bit_stream->fifo.i_available -= i_bits; - i_result = (WORD_SIGNED)p_bit_stream->fifo.buffer - >> (8 * sizeof(WORD_TYPE) - i_bits); - p_bit_stream->fifo.buffer <<= i_bits; - return( i_result ); - } - - /* You can probably do something a little faster, but now I'm tired. */ - return( (WORD_SIGNED)(GetBits( p_bit_stream, i_bits ) << (32 - i_bits)) - >> (32 - i_bits) ); -} - -/***************************************************************************** - * GetBits32 : returns 32 bits from the bit stream and removes them - *****************************************************************************/ -#if (WORD_TYPE == u32) -static inline u32 GetBits32( bit_stream_t * p_bit_stream ) -{ - u32 i_result; - - if( p_bit_stream->fifo.i_available == 32 ) - { - p_bit_stream->fifo.i_available = 0; - i_result = p_bit_stream->fifo.buffer; - p_bit_stream->fifo.buffer = 0; - return( i_result ); - } - - if( p_bit_stream->p_byte <= p_bit_stream->p_end - sizeof(WORD_TYPE) ) - { - if( p_bit_stream->fifo.i_available ) - { - i_result = p_bit_stream->fifo.buffer; - p_bit_stream->fifo.buffer = WORD_AT( p_bit_stream->p_byte ); - p_bit_stream->p_byte = - (byte_t *) ( ((WORD_TYPE *)p_bit_stream->p_byte) + 1 ); - i_result |= p_bit_stream->fifo.buffer - >> (p_bit_stream->fifo.i_available); - p_bit_stream->fifo.buffer <<= (32 - p_bit_stream->fifo.i_available); - return( i_result ); - } - - i_result = WORD_AT( p_bit_stream->p_byte ); - p_bit_stream->p_byte = - (byte_t *) ( ((WORD_TYPE *)p_bit_stream->p_byte) + 1 ); - return( i_result ); - } - - p_bit_stream->fifo.i_available -= 32; - return UnalignedGetBits( p_bit_stream, 32 ); -} -#else -# define GetBits32( p_bit_stream ) GetBits( p_bit_stream, 32 ) -#endif - -/***************************************************************************** - * RealignBits : realigns the bit buffer on an 8-bit boundary - *****************************************************************************/ -static inline void RealignBits( bit_stream_t * p_bit_stream ) -{ - p_bit_stream->fifo.buffer <<= (p_bit_stream->fifo.i_available & 0x7); - p_bit_stream->fifo.i_available &= ~0x7; -} - - -/***************************************************************************** - * GetChunk : reads a large chunk of data - ***************************************************************************** - * The position in the stream must be byte-aligned, if unsure call - * RealignBits(). p_buffer must point to a buffer at least as big as i_buf_len - * otherwise your code will crash. - *****************************************************************************/ -static inline void GetChunk( bit_stream_t * p_bit_stream, - byte_t * p_buffer, size_t i_buf_len ) -{ - ptrdiff_t i_available; - - /* We need to take care because i_buf_len may be < 4. */ - while( p_bit_stream->fifo.i_available > 0 && i_buf_len ) - { - *p_buffer = p_bit_stream->fifo.buffer >> (8 * sizeof(WORD_TYPE) - 8); - p_buffer++; - i_buf_len--; - p_bit_stream->fifo.buffer <<= 8; - p_bit_stream->fifo.i_available -= 8; - } - - if( (i_available = p_bit_stream->p_end - p_bit_stream->p_byte) - >= i_buf_len ) - { - p_bit_stream->p_decoder_fifo->p_vlc->pf_memcpy( p_buffer, - p_bit_stream->p_byte, i_buf_len ); - p_bit_stream->p_byte += i_buf_len; - } - else - { - do - { - p_bit_stream->p_decoder_fifo->p_vlc->pf_memcpy( p_buffer, - p_bit_stream->p_byte, i_available ); - p_bit_stream->p_byte = p_bit_stream->p_end; - p_buffer += i_available; - i_buf_len -= i_available; - BitstreamNextDataPacket( p_bit_stream ); - if( p_bit_stream->p_decoder_fifo->b_die ) - return; - } - while( (i_available = p_bit_stream->p_end - p_bit_stream->p_byte) - <= i_buf_len ); - - if( i_buf_len ) - { - p_bit_stream->p_decoder_fifo->p_vlc->pf_memcpy( p_buffer, - p_bit_stream->p_byte, i_buf_len ); - p_bit_stream->p_byte += i_buf_len; - } - } - - if( p_bit_stream->p_byte <= p_bit_stream->p_end - sizeof(WORD_TYPE) ) - { - AlignWord( p_bit_stream ); - } -} - - -/* - * Communication interface between input and decoders - */ - -/***************************************************************************** - * Prototypes from input_dec.c - *****************************************************************************/ -VLC_EXPORT( void, DecoderError, ( decoder_fifo_t * p_fifo ) ); +VLC_EXPORT( void, input_DeletePES, ( input_buffers_t *, pes_packet_t * ) ); #endif /* "input_ext-dec.h" */