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added/extended some comments in a64multi_encode_frame()

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Originally committed as revision 24913 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Tobias Bindhammer 2010-08-25 11:47:47 +00:00
parent 7f3468d392
commit 9f63810491
1 changed files with 8 additions and 1 deletions
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9
libavcodec/a64multienc.c
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@ -283,28 +283,35 @@ static int a64multi_encode_frame(AVCodecContext *avctx, unsigned char *buf,
req_size = 0; req_size = 0;
/* copy charset to buf */
//XXX this all should maybe move to the muxer? as well as teh chunked/not chunked thing? //XXX this all should maybe move to the muxer? as well as teh chunked/not chunked thing?
/* either write charset as a whole (more comfy when playing from mem) */ /* either write charset as a whole (more comfy when playing from mem) */
/* copy charset chunk if exists */ /* copy charset chunk if exists */
if(c->mc_lifetime) { if(c->mc_lifetime) {
memcpy(buf,charset,0x800*(INTERLACED+1)); memcpy(buf,charset,0x800*(INTERLACED+1));
/* advance pointers */
buf += 0x800*(INTERLACED+1); buf += 0x800*(INTERLACED+1);
charset += 0x800*(INTERLACED+1); charset += 0x800*(INTERLACED+1);
req_size += 0x800*(INTERLACED+1); req_size += 0x800*(INTERLACED+1);
} }
/* no charset so clean buf */
else memset(buf,0,0x800*(INTERLACED+1)); else memset(buf,0,0x800*(INTERLACED+1));
/* write x frames to buf */ /* write x frames to buf */
for (frame = 0; frame < c->mc_lifetime; frame++) { for (frame = 0; frame < c->mc_lifetime; frame++) {
/* buf is uchar*, charmap is int*, so no memcpy here, sorry */ /* copy charmap to buf. buf is uchar*, charmap is int*, so no memcpy here, sorry */
for (a = 0; a < 1000; a++) { for (a = 0; a < 1000; a++) {
buf[a] = charmap[a]; buf[a] = charmap[a];
} }
/* advance pointers */
buf += 0x400; buf += 0x400;
req_size += 0x400; req_size += 0x400;
/* compress and copy colram to buf */
if(c->mc_use_5col) { if(c->mc_use_5col) {
a64_compress_colram(buf,charmap,colram); a64_compress_colram(buf,charmap,colram);
/* advance pointers */
buf += 0x100; buf += 0x100;
req_size += 0x100; req_size += 0x100;
} }