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zmbvenc: move header writing to the end of encode_frame().

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This makes switching to encode2() simpler, because it allows us to know
exactly how large should the output buffer be before we start writing
into it.
This commit is contained in:
Anton Khirnov 2012-02-19 11:16:16 +01:00
parent 8fb26950ed
commit 8c8c7b5e37
1 changed files with 13 additions and 11 deletions
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24
libavcodec/zmbvenc.c
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@ -138,17 +138,6 @@ static int encode_frame(AVCodecContext *avctx, uint8_t *buf, int buf_size, void
p->key_frame= keyframe;
chpal = !keyframe && memcmp(p->data[1], c->pal2, 1024);
fl = (keyframe ? ZMBV_KEYFRAME : 0) | (chpal ? ZMBV_DELTAPAL : 0);
*buf++ = fl; len++;
if(keyframe){
deflateReset(&c->zstream);
*buf++ = 0; len++; // hi ver
*buf++ = 1; len++; // lo ver
*buf++ = 1; len++; // comp
*buf++ = 4; len++; // format - 8bpp
*buf++ = ZMBV_BLOCK; len++; // block width
*buf++ = ZMBV_BLOCK; len++; // block height
}
palptr = (uint32_t*)p->data[1];
src = p->data[0];
prev = c->prev;
@ -223,6 +212,9 @@ static int encode_frame(AVCodecContext *avctx, uint8_t *buf, int buf_size, void
src += p->linesize[0];
}
if (keyframe)
deflateReset(&c->zstream);
c->zstream.next_in = c->work_buf;
c->zstream.avail_in = work_size;
c->zstream.total_in = 0;
@ -235,6 +227,16 @@ static int encode_frame(AVCodecContext *avctx, uint8_t *buf, int buf_size, void
return -1;
}
fl = (keyframe ? ZMBV_KEYFRAME : 0) | (chpal ? ZMBV_DELTAPAL : 0);
*buf++ = fl; len++;
if (keyframe) {
*buf++ = 0; len++; // hi ver
*buf++ = 1; len++; // lo ver
*buf++ = 1; len++; // comp
*buf++ = 4; len++; // format - 8bpp
*buf++ = ZMBV_BLOCK; len++; // block width
*buf++ = ZMBV_BLOCK; len++; // block height
}
memcpy(buf, c->comp_buf, c->zstream.total_out);
return len + c->zstream.total_out;
}