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Diffstat (limited to 'ffmpeg/libavcodec/zmbvenc.c')
| -rw-r--r-- | ffmpeg/libavcodec/zmbvenc.c | 348 |
1 files changed, 348 insertions, 0 deletions
diff --git a/ffmpeg/libavcodec/zmbvenc.c b/ffmpeg/libavcodec/zmbvenc.c new file mode 100644 index 0000000..fb782a4 --- /dev/null +++ b/ffmpeg/libavcodec/zmbvenc.c @@ -0,0 +1,348 @@ +/* + * Zip Motion Blocks Video (ZMBV) encoder + * Copyright (c) 2006 Konstantin Shishkov + * + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * FFmpeg is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +/** + * @file + * Zip Motion Blocks Video encoder + */ + +#include <stdio.h> +#include <stdlib.h> + +#include "libavutil/common.h" +#include "libavutil/intreadwrite.h" +#include "avcodec.h" +#include "internal.h" + +#include <zlib.h> + +#define ZMBV_KEYFRAME 1 +#define ZMBV_DELTAPAL 2 + +#define ZMBV_BLOCK 16 + +/** + * Encoder context + */ +typedef struct ZmbvEncContext { + AVCodecContext *avctx; + AVFrame pic; + + int range; + uint8_t *comp_buf, *work_buf; + uint8_t pal[768]; + uint32_t pal2[256]; //for quick comparisons + uint8_t *prev; + int pstride; + int comp_size; + int keyint, curfrm; + z_stream zstream; +} ZmbvEncContext; + +static int score_tab[256]; + +/** Block comparing function + * XXX should be optimized and moved to DSPContext + * TODO handle out of edge ME + */ +static inline int block_cmp(uint8_t *src, int stride, uint8_t *src2, int stride2, + int bw, int bh, int *xored) +{ + int sum = 0; + int i, j; + uint8_t histogram[256] = {0}; + + *xored = 0; + for(j = 0; j < bh; j++){ + for(i = 0; i < bw; i++){ + int t = src[i] ^ src2[i]; + histogram[t]++; + *xored |= t; + } + src += stride; + src2 += stride2; + } + + for(i = 1; i < 256; i++) + sum += score_tab[histogram[i]]; + + return sum; +} + +/** Motion estimation function + * TODO make better ME decisions + */ +static int zmbv_me(ZmbvEncContext *c, uint8_t *src, int sstride, uint8_t *prev, + int pstride, int x, int y, int *mx, int *my, int *xored) +{ + int dx, dy, tx, ty, tv, bv, bw, bh; + + *mx = *my = 0; + bw = FFMIN(ZMBV_BLOCK, c->avctx->width - x); + bh = FFMIN(ZMBV_BLOCK, c->avctx->height - y); + bv = block_cmp(src, sstride, prev, pstride, bw, bh, xored); + if(!bv) return 0; + for(ty = FFMAX(y - c->range, 0); ty < FFMIN(y + c->range, c->avctx->height - bh); ty++){ + for(tx = FFMAX(x - c->range, 0); tx < FFMIN(x + c->range, c->avctx->width - bw); tx++){ + if(tx == x && ty == y) continue; // we already tested this block + dx = tx - x; + dy = ty - y; + tv = block_cmp(src, sstride, prev + dx + dy*pstride, pstride, bw, bh, xored); + if(tv < bv){ + bv = tv; + *mx = dx; + *my = dy; + if(!bv) return 0; + } + } + } + return bv; +} + +static int encode_frame(AVCodecContext *avctx, AVPacket *pkt, + const AVFrame *pict, int *got_packet) +{ + ZmbvEncContext * const c = avctx->priv_data; + AVFrame * const p = &c->pic; + uint8_t *src, *prev, *buf; + uint32_t *palptr; + int keyframe, chpal; + int fl; + int work_size = 0, pkt_size; + int bw, bh; + int i, j, ret; + + keyframe = !c->curfrm; + c->curfrm++; + if(c->curfrm == c->keyint) + c->curfrm = 0; + *p = *pict; + p->pict_type= keyframe ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P; + p->key_frame= keyframe; + chpal = !keyframe && memcmp(p->data[1], c->pal2, 1024); + + palptr = (uint32_t*)p->data[1]; + src = p->data[0]; + prev = c->prev; + if(chpal){ + uint8_t tpal[3]; + for(i = 0; i < 256; i++){ + AV_WB24(tpal, palptr[i]); + c->work_buf[work_size++] = tpal[0] ^ c->pal[i * 3 + 0]; + c->work_buf[work_size++] = tpal[1] ^ c->pal[i * 3 + 1]; + c->work_buf[work_size++] = tpal[2] ^ c->pal[i * 3 + 2]; + c->pal[i * 3 + 0] = tpal[0]; + c->pal[i * 3 + 1] = tpal[1]; + c->pal[i * 3 + 2] = tpal[2]; + } + memcpy(c->pal2, p->data[1], 1024); + } + if(keyframe){ + for(i = 0; i < 256; i++){ + AV_WB24(c->pal+(i*3), palptr[i]); + } + memcpy(c->work_buf, c->pal, 768); + memcpy(c->pal2, p->data[1], 1024); + work_size = 768; + for(i = 0; i < avctx->height; i++){ + memcpy(c->work_buf + work_size, src, avctx->width); + src += p->linesize[0]; + work_size += avctx->width; + } + }else{ + int x, y, bh2, bw2, xored; + uint8_t *tsrc, *tprev; + uint8_t *mv; + int mx, my; + + bw = (avctx->width + ZMBV_BLOCK - 1) / ZMBV_BLOCK; + bh = (avctx->height + ZMBV_BLOCK - 1) / ZMBV_BLOCK; + mv = c->work_buf + work_size; + memset(c->work_buf + work_size, 0, (bw * bh * 2 + 3) & ~3); + work_size += (bw * bh * 2 + 3) & ~3; + /* for now just XOR'ing */ + for(y = 0; y < avctx->height; y += ZMBV_BLOCK) { + bh2 = FFMIN(avctx->height - y, ZMBV_BLOCK); + for(x = 0; x < avctx->width; x += ZMBV_BLOCK, mv += 2) { + bw2 = FFMIN(avctx->width - x, ZMBV_BLOCK); + + tsrc = src + x; + tprev = prev + x; + + zmbv_me(c, tsrc, p->linesize[0], tprev, c->pstride, x, y, &mx, &my, &xored); + mv[0] = (mx << 1) | !!xored; + mv[1] = my << 1; + tprev += mx + my * c->pstride; + if(xored){ + for(j = 0; j < bh2; j++){ + for(i = 0; i < bw2; i++) + c->work_buf[work_size++] = tsrc[i] ^ tprev[i]; + tsrc += p->linesize[0]; + tprev += c->pstride; + } + } + } + src += p->linesize[0] * ZMBV_BLOCK; + prev += c->pstride * ZMBV_BLOCK; + } + } + /* save the previous frame */ + src = p->data[0]; + prev = c->prev; + for(i = 0; i < avctx->height; i++){ + memcpy(prev, src, avctx->width); + prev += c->pstride; + 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; + + c->zstream.next_out = c->comp_buf; + c->zstream.avail_out = c->comp_size; + c->zstream.total_out = 0; + if(deflate(&c->zstream, Z_SYNC_FLUSH) != Z_OK){ + av_log(avctx, AV_LOG_ERROR, "Error compressing data\n"); + return -1; + } + + pkt_size = c->zstream.total_out + 1 + 6*keyframe; + if ((ret = ff_alloc_packet2(avctx, pkt, pkt_size)) < 0) + return ret; + buf = pkt->data; + + fl = (keyframe ? ZMBV_KEYFRAME : 0) | (chpal ? ZMBV_DELTAPAL : 0); + *buf++ = fl; + if (keyframe) { + *buf++ = 0; // hi ver + *buf++ = 1; // lo ver + *buf++ = 1; // comp + *buf++ = 4; // format - 8bpp + *buf++ = ZMBV_BLOCK; // block width + *buf++ = ZMBV_BLOCK; // block height + } + memcpy(buf, c->comp_buf, c->zstream.total_out); + + pkt->flags |= AV_PKT_FLAG_KEY*keyframe; + *got_packet = 1; + + return 0; +} + + +/** + * Init zmbv encoder + */ +static av_cold int encode_init(AVCodecContext *avctx) +{ + ZmbvEncContext * const c = avctx->priv_data; + int zret; // Zlib return code + int i; + int lvl = 9; + + for(i=1; i<256; i++) + score_tab[i]= -i * log(i/(double)(ZMBV_BLOCK*ZMBV_BLOCK)) * (256/M_LN2); + + c->avctx = avctx; + + c->curfrm = 0; + c->keyint = avctx->keyint_min; + c->range = 8; + if(avctx->me_range > 0) + c->range = FFMIN(avctx->me_range, 127); + + if(avctx->compression_level >= 0) + lvl = avctx->compression_level; + if(lvl < 0 || lvl > 9){ + av_log(avctx, AV_LOG_ERROR, "Compression level should be 0-9, not %i\n", lvl); + return AVERROR(EINVAL); + } + + // Needed if zlib unused or init aborted before deflateInit + memset(&c->zstream, 0, sizeof(z_stream)); + c->comp_size = avctx->width * avctx->height + 1024 + + ((avctx->width + ZMBV_BLOCK - 1) / ZMBV_BLOCK) * ((avctx->height + ZMBV_BLOCK - 1) / ZMBV_BLOCK) * 2 + 4; + if ((c->work_buf = av_malloc(c->comp_size)) == NULL) { + av_log(avctx, AV_LOG_ERROR, "Can't allocate work buffer.\n"); + return AVERROR(ENOMEM); + } + /* Conservative upper bound taken from zlib v1.2.1 source via lcl.c */ + c->comp_size = c->comp_size + ((c->comp_size + 7) >> 3) + + ((c->comp_size + 63) >> 6) + 11; + + /* Allocate compression buffer */ + if ((c->comp_buf = av_malloc(c->comp_size)) == NULL) { + av_log(avctx, AV_LOG_ERROR, "Can't allocate compression buffer.\n"); + return AVERROR(ENOMEM); + } + c->pstride = FFALIGN(avctx->width, 16); + if ((c->prev = av_malloc(c->pstride * avctx->height)) == NULL) { + av_log(avctx, AV_LOG_ERROR, "Can't allocate picture.\n"); + return AVERROR(ENOMEM); + } + + c->zstream.zalloc = Z_NULL; + c->zstream.zfree = Z_NULL; + c->zstream.opaque = Z_NULL; + zret = deflateInit(&c->zstream, lvl); + if (zret != Z_OK) { + av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret); + return -1; + } + + avctx->coded_frame = &c->pic; + + return 0; +} + + + +/** + * Uninit zmbv encoder + */ +static av_cold int encode_end(AVCodecContext *avctx) +{ + ZmbvEncContext * const c = avctx->priv_data; + + av_freep(&c->comp_buf); + av_freep(&c->work_buf); + + deflateEnd(&c->zstream); + av_freep(&c->prev); + + return 0; +} + +AVCodec ff_zmbv_encoder = { + .name = "zmbv", + .type = AVMEDIA_TYPE_VIDEO, + .id = AV_CODEC_ID_ZMBV, + .priv_data_size = sizeof(ZmbvEncContext), + .init = encode_init, + .encode2 = encode_frame, + .close = encode_end, + .pix_fmts = (const enum AVPixelFormat[]){ AV_PIX_FMT_PAL8, AV_PIX_FMT_NONE }, + .long_name = NULL_IF_CONFIG_SMALL("Zip Motion Blocks Video"), +}; |