mirror of
https://github.com/mpv-player/mpv
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76538ed792
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@6351 b3059339-0415-0410-9bf9-f77b7e298cf2
188 lines
4.1 KiB
Plaintext
188 lines
4.1 KiB
Plaintext
The work has been based on the RV30 codec, but since RV20 has the same
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interface, it might work for it as well.
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error codes (the software uses redmond originated error codes)
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1. internal code (1-10)
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2. result
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0 00000000 success
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1 80004005 E_FAIL
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2 8007000E E_OUTOFMEMORY
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3,9 80004001 E_NOTIMPL
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4,5 80070005 E_ACCESSDENIED
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6 80004003 E_POINTER
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7,10 80070057 E_INVALIDREG
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8 80040FC1 (or 1FC?: CO_E_OBJISREG) - never occured here
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I think the only relevant file is the decoder drv[23].so.6.0
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The rv[23]0 ones are just for streaming. We do this ourselves.
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The codec consists of several functions. The relevant ones are:
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RV20toYUV420Init()
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RV20toYUV420Transform()
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RV20toYUV420CustomMessage()
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RV20toYUV420Free()
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The others are irrelevant (seems to me). HiveMessage doesn't manipulate
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anything and is only called in the beginning.
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result=RV20toYUV420Init(struct init_data *, struct rvyuvMain **);
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struct init_data {
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short constant=0xb;
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short width, height;
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short 0, 0, 0;
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ulong format1;
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long 1;
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ulong format2;
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};
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format1 and format2 are stored in the .rm file's stream headers.
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(format1>>16)&3 seems to be a sub-codec id/selector, at least for rv30
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it's the only difference between low and high bitrate files.
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result=RV20toYUV420Transform(char *input_stream, char *output_data,
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struct transin *, struct transout *, struct rvyuvMain *);
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struct transin {
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ulong length_of_input_data;
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ulong null;
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ulong num_sub_packets_in_block_minus_one;
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ulong *sub_packets_list;
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ulong another_null;
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ulong timestamp_from_stream;
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};
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struct transout {
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ulong flag1; // ((var_94&2!=0)&&(result==0))?1:0
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ulong flag2; // 4 LBS from var_94
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ulong zero;
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ulong width, height;
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};
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The length of output_stream is 1.5*width*height (I420 planar yuv 4:2:0).
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input_stream is the exact data from the data block for one frame.
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sub_packets_list is a list of num_sub_packets pairs of long values, in form:
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1, 0,
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1, offset_2nd,
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1, offset_3rd,
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1, offset_4th,
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...
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where offset_* are the offsets or sub-packets relative to input_stream.
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result=RV20toYUV420CustomMessage(ulong *msg, struct rvyuvMain *);
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Messages used by RV30:
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A message is a triplet (cmd,val,ext) of ulong.
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NOTE:
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rv30 only requires the (0x24,2|3,{w,h,w,h}) message. others can be left out!
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rv20 only requires the (0x11,2,0) message in rp8, before each transform call.
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(3,2,0)
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returns always(?) an error, since a global variable inside the codec
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(which points to a function similar to custommessage), is always NULL
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(0x11,0|1|2,0)
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val=0|1: sets intern2 to val, when intern1 is non-zero
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return 3 when intern1 is zero and val is 1
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else returns 0
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val=2: return intern2
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what does intern[1,2] mean?
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(0x12,...)
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used by rv20, function unknown, can be ignored
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(0x1e,2|3,1)
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calls a subroutine and returns the result, purpose has to be detemined
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(0x24,subcodec,{...})
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copies 4 dwords to rvyuvMain+07c: { width, height, 0, 0 }
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subcodec must be 2 (low-bitrate) or 3 (high-bitrate) for rv30.
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the codec type (low vs high) can be determined from 1+((format1>>16)&3)
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for rv20, this call should be ignored! (makes codec crashing)
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(0x1c,a,b) - called inside transform
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to be analyzed
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(105,...)
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used by rv20, function unknown, can be ignored
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structure of rvyuvMain:
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-----------------------
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DWORDS (the entries are not always constant)
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there are two w/h pairs at 05C. the first is the size of the
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unscaled video stream, the second possibly image size
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000 1 6 3 1
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010 1 0 AEBFC0D1(magic) 0
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020 0 ptr->? 0 0
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030 0 0 ->rvyuvMain+0x050 ?
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040 width height 0x17 0x479
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050 ->rvyuvMain 0x17 0x17 width
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060 height width height 0
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070 0 1 0 0
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080 0 0xb w h
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090 w h 0 0
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0A0 1 0xb0(w?) 0x58 0x58
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0B0 ptr->? 0 0 1
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0C0 0x32 1 0 0
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0D0 0 0 0 0
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0E0 0 0 0 0
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0F0 0 0 0 0
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100 0 0 0 0
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110 p p p p p are pointers to several function, for
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120 p p p p example to the actual public functions
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130 p p p p (except init, the others are some kind of
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140 p p p p interfaces)
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150 p 0 0 0
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160 0 0x2000 1 0
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170 0 0 0 0
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180 1 1 0 0
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190 0 0 0 0
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1A0 0 0 0 0
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1B0 1 0 ptr->? ptr->?
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1C0 1 0 0 0
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1D0 0 0 0 0
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1E0 0 0 0 0
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...
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Order of calls:
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---------------
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Init
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(0x11,0,0)
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(0x24,2,{...})
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[
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(3,2,0)->80004001
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(0x11,1,0)
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(0x1e,3,1)
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Transform (internally calls (0x1c,x,y))
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(11,2,0)
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]
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Free
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