mirror of https://code.videolan.org/videolan/vlc
* Updated documentation with recent changes ;
* Decoders are niced again, for it is really better.
This commit is contained in:
Christophe Massiot
parent
24305848d4
commit
33687bb4ac
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@ -0,0 +1,7 @@
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manual.aux
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manual.dvi
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manual.html
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manual.log
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manual.ps
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manual.tex
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manual.txt
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@ -18,25 +18,25 @@ JADE=jade
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manual: manual.txt manual.ps manual.html
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%.tex: %.xml
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$(JADE) -t tex -V %section-autolabel% -d $(PRINT_SS) $(XML_DECL) $<
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manual.tex: audio_output.xml debugging.xml decoders.xml gfdl.xml glossary.xml history.xml input.xml interface.xml manual.xml overview.xml ports.xml video_output.xml
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$(JADE) -t tex -V %section-autolabel% -d $(PRINT_SS) $(XML_DECL) manual.xml
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perl -i.bak -pe 's/\000//g' $@ && rm $*.tex.bak
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# No it's not a joke
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%.html: %.xml
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manual.html: audio_output.xml debugging.xml decoders.xml gfdl.xml glossary.xml history.xml input.xml interface.xml manual.xml overview.xml ports.xml video_output.xml
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$(JADE) -t sgml -V %section-autolabel% -V nochunks \
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-d $(HTML_SS) $(XML_DECL) $< > $@
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-d $(HTML_SS) $(XML_DECL) manual.xml > $@
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%.dvi: %.tex
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jadetex $<
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jadetex $<
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jadetex $<
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manual.dvi: manual.tex modules.eps ps.eps stream.eps ts.eps
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jadetex manual.tex
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jadetex manual.tex
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jadetex manual.tex
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%.ps: %.dvi
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manual.ps: manual.dvi
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dvips -f $< > $@
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%.txt: %.xml
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$(JADE) -t sgml -V nochunks -d $(HTML_SS) $(XML_DECL) $< > dump.html
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manual.txt: audio_output.xml debugging.xml decoders.xml gfdl.xml glossary.xml history.xml input.xml interface.xml manual.xml overview.xml ports.xml video_output.xml
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$(JADE) -t sgml -V nochunks -d $(HTML_SS) $(XML_DECL) manual.xml > dump.html
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lynx -force_html -dump dump.html > $@
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-rm -f dump.html
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@ -310,16 +310,13 @@ be described in the following section.
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VideoLAN Client provides an MPEG-1, and an MPEG-2 Main Profile @
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Main Level decoder. It has been natively written for VLC, and is quite
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mature. Its status is a bit special, since it is splitted between two
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modules : video parser and video decoder [this is subject to change].
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logicial entities : video parser and video decoder.
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The initial goal is to separate bit stream parsing functions from
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highly parallelizable mathematical algorithms. In theory, there can be
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one video parser thread (and only one, otherwise we would have race
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conditions reading the bit stream), along with several video decoder
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conditions reading the bit stream), along with a pool of video decoder
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threads, which do IDCT and motion compensation on several blocks
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at once [practically,
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multi-threaded mode hasn't been tested for a while, still needs some
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work, and was actually slower than mono-threaded mode ; the
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multi-threaded mode won't be documented for the moment].
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at once.
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</para>
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<para>
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@ -375,7 +372,9 @@ Note also that the DMV algorithm is untested and is probably buggy.
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<para>
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Just like motion compensation, IDCT is platform-specific. So we moved it
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to <filename> plugins/idct</filename>. You need to define four methods :
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to <filename> plugins/idct</filename>. This module does the IDCT
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calculation, and copies the data to the final picture. You need to define
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seven methods :
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</para>
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<itemizedlist>
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@ -407,6 +406,25 @@ to <filename> plugins/idct</filename>. You need to define four methods :
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some IDCT (MMX) need to invert certain coefficients in the
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MPEG scan matrices (see ISO/IEC 13818-2).
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</para> </listitem>
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<listitem> <para> <function> vdec_InitDecode </function>
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<parameter> ( struct vdec_thread_s * p_vdec ) </parameter> :
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Initializes the IDCT and optional crop tables.
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</para> </listitem>
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<listitem> <para> <function> vdec_DecodeMacroblockC </function>
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<parameter> ( struct vdec_thread_s *p_vdec,
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struct macroblock_s * p_mb ); </parameter> :
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Decodes an entire macroblock and copies its data to the final
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picture, including chromatic information.
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</para> </listitem>
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<listitem> <para> <function> vdec_DecodeMacroblockBW </function>
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<parameter> ( struct vdec_thread_s *p_vdec,
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struct macroblock_s * p_mb ); </parameter> :
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Decodes an entire macroblock and copies its data to the final
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picture, except chromatic information (used in grayscale mode).
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</para> </listitem>
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</itemizedlist>
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<para>
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@ -417,10 +435,21 @@ and the simple 1-D separation IDCT from the ISO reference decoder
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(<filename>idctclassic.c</filename>).
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</para>
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</sect2>
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<sect2> <title> Symmetrical Multiprocessing </title>
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<para>
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[In the future, the IDCT plug-in will include <function> vdec_AddBlock
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</function> and <function> vdec_CopyBlock </function>, which are
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often architecture-specific.]
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The MPEG video decoder of VLC can take advantage of several processors if
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necessary. The idea is to launch a pool of decoders, which will do
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IDCT/motion compensation on several macroblocks at once.
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</para>
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<para>
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The functions managing the pool are in <filename>
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src/video_decoder/vpar_pool.c</filename>. Its use on non-SMP machines is
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not recommanded, since it is actually slower than the monothread version.
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Even on SMP machines sometimes...
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</para>
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</sect2>
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@ -92,6 +92,7 @@ reasons, we don't call <function>pthread_*</function> functions
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directly, but use a similar wrapper, made of <function> vlc_thread_create,
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vlc_thread_exit, vlc_thread_join, vlc_mutex_init, vlc_mutex_lock,
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vlc_mutex_unlock, vlc_mutex_destroy, vlc_cond_init, vlc_cond_signal,
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vlc_cond_broadcast,
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vlc_cond_wait, vlc_cond_destroy</function>, and structures <type>
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vlc_thread_t, vlc_mutex_t, and vlc_cond_t</type>.
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</para>
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@ -165,7 +166,7 @@ don't need usage of the module name.
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<sect2> <title> Variable naming </title>
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<para>
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Hungarian notations used, that means we have the following prefixes :
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Hungarian notations are used, that means we have the following prefixes :
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</para>
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<itemizedlist>
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@ -458,7 +458,10 @@
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#define VDEC_SMP_VAR "vlc_smp"
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/* No SMP by default, since it slows down things on non-smp machines. */
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#define VDEC_SMP_DEFAULT 0
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#define VDEC_SMP_DEFAULT 0
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/* Nice increments for decoders -- necessary for x11 scheduling */
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#define VDEC_NICE 3
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/*****************************************************************************
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* Messages and console interfaces configuration
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@ -2,7 +2,7 @@
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* video_decoder.c : video decoder thread
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*****************************************************************************
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* Copyright (C) 1999, 2000 VideoLAN
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* $Id: video_decoder.c,v 1.54 2001/07/18 14:21:00 massiot Exp $
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* $Id: video_decoder.c,v 1.55 2001/07/18 17:05:39 massiot Exp $
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*
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* Authors: Christophe Massiot <massiot@via.ecp.fr>
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* Gaël Hendryckx <jimmy@via.ecp.fr>
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@ -130,6 +130,18 @@ void vdec_InitThread( vdec_thread_t *p_vdec )
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{
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intf_DbgMsg("vdec debug: initializing video decoder thread %p", p_vdec);
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#if !defined(SYS_BEOS) && !defined(WIN32)
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# if VDEC_NICE
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/* Re-nice ourself - otherwise we would steal CPU time from the video
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* output, which would make a poor display. */
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if( nice(VDEC_NICE) == -1 )
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{
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intf_WarnMsg( 2, "vpar warning : couldn't nice() (%s)",
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strerror(errno) );
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}
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# endif
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#endif
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p_vdec->p_idct_data = NULL;
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p_vdec->p_pool->pf_decode_init( p_vdec );
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@ -2,7 +2,7 @@
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* vpar_blocks.c : blocks parsing
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*****************************************************************************
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* Copyright (C) 1999, 2000 VideoLAN
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* $Id: vpar_blocks.c,v 1.3 2001/07/18 14:21:00 massiot Exp $
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* $Id: vpar_blocks.c,v 1.4 2001/07/18 17:05:39 massiot Exp $
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*
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* Authors: Christophe Massiot <massiot@via.ecp.fr>
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* Jean-Marc Dressler <polux@via.ecp.fr>
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@ -1347,6 +1347,9 @@ static __inline__ void MotionVector( vpar_thread_t * p_vpar,
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}
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/* Dual Prime Arithmetic (ISO/IEC 13818-2 section 7.6.3.6). */
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/* FIXME */
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intf_Msg( "Your stream uses Dual Prime Arithmetic. Please send a mail"
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"to massiot@via.ecp.fr for debugging purposes. Thank you." );
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#define i_mv_x p_mb->pppi_motion_vectors[0][0][0]
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if( i_structure == FRAME_STRUCTURE )
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