summaryrefslogtreecommitdiff
path: root/apps/codecs/mpa.c
diff options
context:
space:
mode:
Diffstat (limited to 'apps/codecs/mpa.c')
0 files changed, 0 insertions, 0 deletions
generated by cgit v1.1 at 2026-05-19 05:43:48 +0000
='#n54'>54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 


ABOUT LIBMPEG2

libmpeg2 is a free library for decoding mpeg-2 and mpeg-1 video
streams. It is released under the terms of the GPL license.

The main goals in libmpeg2 development are:

      *	Conformance - libmpeg2 is able to decode all mpeg streams that
	conform to certain restrictions: "constrained parameters" for
	mpeg-1, and "main profile" for mpeg-2. In practice, this is
	what most people are using. For streams that follow these
	restrictions, we believe libmpeg2 is 100% conformant to the
	mpeg standards - and we have a pretty extensive test suite to
	check this.

      *	Speed - there has been huge efforts there, and we believe
	libmpeg2 is the fastest library around for what it
	does. Please tell us if you find a faster one ! With typical
	video streams as found on DVD's, and doing only decoding with
	no display, you should be able to get about 110 fps on a
	PIII/666, or 150 fps on an Athlon/950. This is less than 20
	cycles per output pixel. In a real player program, the display
	routines will probably take as much time as the actual
	decoding !

      *	Portability - most of the code is written in C, and when we
	use platform-specific optimizations (typically assembly
	routines, currently used for the motion compensation and the
	inverse cosine transform stages) we always have a generic C
	routine to fall back on.  This should be portable to all
	architectures - at least we have heard reports from people
	running this code on x86, ppc, sparc, arm and
	sh4. Assembly-optimized implementations are available on x86
	(MMX) and ppc (altivec) architectures. Ultrasparc (VIS) is
	probably the next on the list - we'll see.

      *	Reuseability - we do not want libmpeg2 to include any
	project-specific code, but it should still include enough
	features to be used by very diverse projects. We are only