[deb_ffmpeg.git] / ffmpeg / libavcodec / zmbvenc.c

/*
 * 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;

    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;
    const AVFrame * const p = pict;
    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;
    avctx->coded_frame->pict_type = keyframe ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
    avctx->coded_frame->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;
}

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);

    av_frame_free(&avctx->coded_frame);

    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))) {
        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))) {
        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))) {
        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 = av_frame_alloc();
    if (!avctx->coded_frame) {
        encode_end(avctx);
        return AVERROR(ENOMEM);
    }

    return 0;
}

AVCodec ff_zmbv_encoder = {
    .name           = "zmbv",
    .long_name      = NULL_IF_CONFIG_SMALL("Zip Motion Blocks Video"),
    .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 },
};
Commit	Line	Data
2ba45a60 DM	1	/*
	2	* Zip Motion Blocks Video (ZMBV) encoder
	3	* Copyright (c) 2006 Konstantin Shishkov
	4	*
	5	* This file is part of FFmpeg.
	6	*
	7	* FFmpeg is free software; you can redistribute it and/or
	8	* modify it under the terms of the GNU Lesser General Public
	9	* License as published by the Free Software Foundation; either
	10	* version 2.1 of the License, or (at your option) any later version.
	11	*
	12	* FFmpeg is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	15	* Lesser General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU Lesser General Public
	18	* License along with FFmpeg; if not, write to the Free Software
	19	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	20	*/
	21
	22	/**
	23	* @file
	24	* Zip Motion Blocks Video encoder
	25	*/
	26
	27	#include <stdio.h>
	28	#include <stdlib.h>
	29
	30	#include "libavutil/common.h"
	31	#include "libavutil/intreadwrite.h"
	32	#include "avcodec.h"
	33	#include "internal.h"
	34
	35	#include <zlib.h>
	36
	37	#define ZMBV_KEYFRAME 1
	38	#define ZMBV_DELTAPAL 2
	39
	40	#define ZMBV_BLOCK 16
	41
	42	/**
	43	* Encoder context
	44	*/
	45	typedef struct ZmbvEncContext {
	46	AVCodecContext *avctx;
	47
	48	int range;
	49	uint8_t comp_buf, work_buf;
	50	uint8_t pal[768];
	51	uint32_t pal2[256]; //for quick comparisons
	52	uint8_t *prev;
	53	int pstride;
	54	int comp_size;
	55	int keyint, curfrm;
	56	z_stream zstream;
	57	} ZmbvEncContext;
	58
	59	static int score_tab[256];
	60
	61	/** Block comparing function
	62	* XXX should be optimized and moved to DSPContext
	63	* TODO handle out of edge ME
	64	*/
65	static inline int block_cmp(uint8_t src, int stride, uint8_t src2, int stride2,
66	int bw, int bh, int *xored)
67	{
68	int sum = 0;
69	int i, j;
70	uint8_t histogram[256] = {0};
71
72	*xored = 0;
73	for(j = 0; j < bh; j++){
74	for(i = 0; i < bw; i++){
75	int t = src[i] ^ src2[i];
76	histogram[t]++;
77	*xored \|= t;
78	}
79	src += stride;
80	src2 += stride2;
81	}
82
83	for(i = 1; i < 256; i++)
84	sum += score_tab[histogram[i]];
85
86	return sum;
87	}
88
89	/** Motion estimation function
90	* TODO make better ME decisions
91	*/
92	static int zmbv_me(ZmbvEncContext c, uint8_t src, int sstride, uint8_t *prev,
93	int pstride, int x, int y, int mx, int my, int *xored)
94	{
95	int dx, dy, tx, ty, tv, bv, bw, bh;
96
97	mx = my = 0;
98	bw = FFMIN(ZMBV_BLOCK, c->avctx->width - x);
99	bh = FFMIN(ZMBV_BLOCK, c->avctx->height - y);
100	bv = block_cmp(src, sstride, prev, pstride, bw, bh, xored);
101	if(!bv) return 0;
102	for(ty = FFMAX(y - c->range, 0); ty < FFMIN(y + c->range, c->avctx->height - bh); ty++){
103	for(tx = FFMAX(x - c->range, 0); tx < FFMIN(x + c->range, c->avctx->width - bw); tx++){
104	if(tx == x && ty == y) continue; // we already tested this block
105	dx = tx - x;
106	dy = ty - y;
107	tv = block_cmp(src, sstride, prev + dx + dy*pstride, pstride, bw, bh, xored);
108	if(tv < bv){
109	bv = tv;
110	*mx = dx;
111	*my = dy;
112	if(!bv) return 0;
113	}
114	}
115	}
116	return bv;
117	}
118
119	static int encode_frame(AVCodecContext avctx, AVPacket pkt,
120	const AVFrame pict, int got_packet)
121	{
122	ZmbvEncContext * const c = avctx->priv_data;
123	const AVFrame * const p = pict;
124	uint8_t src, prev, *buf;
125	uint32_t *palptr;
126	int keyframe, chpal;
127	int fl;
128	int work_size = 0, pkt_size;
129	int bw, bh;
130	int i, j, ret;
131
132	keyframe = !c->curfrm;
133	c->curfrm++;
134	if(c->curfrm == c->keyint)
135	c->curfrm = 0;
136	avctx->coded_frame->pict_type = keyframe ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
137	avctx->coded_frame->key_frame = keyframe;
138	chpal = !keyframe && memcmp(p->data[1], c->pal2, 1024);
139
140	palptr = (uint32_t*)p->data[1];
141	src = p->data[0];
142	prev = c->prev;
143	if(chpal){
144	uint8_t tpal[3];
145	for(i = 0; i < 256; i++){
146	AV_WB24(tpal, palptr[i]);
147	c->work_buf[work_size++] = tpal[0] ^ c->pal[i * 3 + 0];
148	c->work_buf[work_size++] = tpal[1] ^ c->pal[i * 3 + 1];
149	c->work_buf[work_size++] = tpal[2] ^ c->pal[i * 3 + 2];
150	c->pal[i * 3 + 0] = tpal[0];
151	c->pal[i * 3 + 1] = tpal[1];
152	c->pal[i * 3 + 2] = tpal[2];
153	}
154	memcpy(c->pal2, p->data[1], 1024);
155	}
156	if(keyframe){
157	for(i = 0; i < 256; i++){
158	AV_WB24(c->pal+(i*3), palptr[i]);
159	}
160	memcpy(c->work_buf, c->pal, 768);
161	memcpy(c->pal2, p->data[1], 1024);
162	work_size = 768;
163	for(i = 0; i < avctx->height; i++){
164	memcpy(c->work_buf + work_size, src, avctx->width);
165	src += p->linesize[0];
166	work_size += avctx->width;
167	}
168	}else{
169	int x, y, bh2, bw2, xored;
170	uint8_t tsrc, tprev;
171	uint8_t *mv;
172	int mx, my;
173
174	bw = (avctx->width + ZMBV_BLOCK - 1) / ZMBV_BLOCK;
175	bh = (avctx->height + ZMBV_BLOCK - 1) / ZMBV_BLOCK;
176	mv = c->work_buf + work_size;
177	memset(c->work_buf + work_size, 0, (bw * bh * 2 + 3) & ~3);
178	work_size += (bw * bh * 2 + 3) & ~3;
179	/* for now just XOR'ing */
180	for(y = 0; y < avctx->height; y += ZMBV_BLOCK) {
181	bh2 = FFMIN(avctx->height - y, ZMBV_BLOCK);
182	for(x = 0; x < avctx->width; x += ZMBV_BLOCK, mv += 2) {
183	bw2 = FFMIN(avctx->width - x, ZMBV_BLOCK);
184
185	tsrc = src + x;
186	tprev = prev + x;
187
188	zmbv_me(c, tsrc, p->linesize[0], tprev, c->pstride, x, y, &mx, &my, &xored);
189	mv[0] = (mx << 1) \| !!xored;
190	mv[1] = my << 1;
191	tprev += mx + my * c->pstride;
192	if(xored){
193	for(j = 0; j < bh2; j++){
194	for(i = 0; i < bw2; i++)
195	c->work_buf[work_size++] = tsrc[i] ^ tprev[i];
196	tsrc += p->linesize[0];
197	tprev += c->pstride;
198	}
199	}
200	}
201	src += p->linesize[0] * ZMBV_BLOCK;
202	prev += c->pstride * ZMBV_BLOCK;
203	}
204	}
205	/* save the previous frame */
206	src = p->data[0];
207	prev = c->prev;
208	for(i = 0; i < avctx->height; i++){
209	memcpy(prev, src, avctx->width);
210	prev += c->pstride;
211	src += p->linesize[0];
212	}
213
214	if (keyframe)
215	deflateReset(&c->zstream);
216
217	c->zstream.next_in = c->work_buf;
218	c->zstream.avail_in = work_size;
219	c->zstream.total_in = 0;
220
221	c->zstream.next_out = c->comp_buf;
222	c->zstream.avail_out = c->comp_size;
223	c->zstream.total_out = 0;
224	if(deflate(&c->zstream, Z_SYNC_FLUSH) != Z_OK){
225	av_log(avctx, AV_LOG_ERROR, "Error compressing data\n");
226	return -1;
227	}
228
229	pkt_size = c->zstream.total_out + 1 + 6*keyframe;
230	if ((ret = ff_alloc_packet2(avctx, pkt, pkt_size)) < 0)
231	return ret;
232	buf = pkt->data;
233
234	fl = (keyframe ? ZMBV_KEYFRAME : 0) \| (chpal ? ZMBV_DELTAPAL : 0);
235	*buf++ = fl;
236	if (keyframe) {
237	*buf++ = 0; // hi ver
238	*buf++ = 1; // lo ver
239	*buf++ = 1; // comp
240	*buf++ = 4; // format - 8bpp
241	*buf++ = ZMBV_BLOCK; // block width
242	*buf++ = ZMBV_BLOCK; // block height
243	}
244	memcpy(buf, c->comp_buf, c->zstream.total_out);
245
246	pkt->flags \|= AV_PKT_FLAG_KEY*keyframe;
247	*got_packet = 1;
248
249	return 0;
250	}
251
252	static av_cold int encode_end(AVCodecContext *avctx)
253	{
254	ZmbvEncContext * const c = avctx->priv_data;
255
256	av_freep(&c->comp_buf);
257	av_freep(&c->work_buf);
258
259	deflateEnd(&c->zstream);
260	av_freep(&c->prev);
261
262	av_frame_free(&avctx->coded_frame);
263
264	return 0;
265	}
266
267	/**
268	* Init zmbv encoder
269	*/
270	static av_cold int encode_init(AVCodecContext *avctx)
271	{
272	ZmbvEncContext * const c = avctx->priv_data;
273	int zret; // Zlib return code
274	int i;
275	int lvl = 9;
276
277	for(i=1; i<256; i++)
278	score_tab[i]= -i * log(i/(double)(ZMBV_BLOCKZMBV_BLOCK)) (256/M_LN2);
279
280	c->avctx = avctx;
281
282	c->curfrm = 0;
283	c->keyint = avctx->keyint_min;
284	c->range = 8;
285	if(avctx->me_range > 0)
286	c->range = FFMIN(avctx->me_range, 127);
287
288	if(avctx->compression_level >= 0)
289	lvl = avctx->compression_level;
290	if(lvl < 0 \|\| lvl > 9){
291	av_log(avctx, AV_LOG_ERROR, "Compression level should be 0-9, not %i\n", lvl);
292	return AVERROR(EINVAL);
293	}
294
295	// Needed if zlib unused or init aborted before deflateInit
296	memset(&c->zstream, 0, sizeof(z_stream));
297	c->comp_size = avctx->width * avctx->height + 1024 +
298	((avctx->width + ZMBV_BLOCK - 1) / ZMBV_BLOCK) * ((avctx->height + ZMBV_BLOCK - 1) / ZMBV_BLOCK) * 2 + 4;
299	if (!(c->work_buf = av_malloc(c->comp_size))) {
300	av_log(avctx, AV_LOG_ERROR, "Can't allocate work buffer.\n");
301	return AVERROR(ENOMEM);
302	}
303	/* Conservative upper bound taken from zlib v1.2.1 source via lcl.c */
304	c->comp_size = c->comp_size + ((c->comp_size + 7) >> 3) +
305	((c->comp_size + 63) >> 6) + 11;
306
307	/* Allocate compression buffer */
308	if (!(c->comp_buf = av_malloc(c->comp_size))) {
309	av_log(avctx, AV_LOG_ERROR, "Can't allocate compression buffer.\n");
310	return AVERROR(ENOMEM);
311	}
312	c->pstride = FFALIGN(avctx->width, 16);
313	if (!(c->prev = av_malloc(c->pstride * avctx->height))) {
314	av_log(avctx, AV_LOG_ERROR, "Can't allocate picture.\n");
315	return AVERROR(ENOMEM);
316	}
317
318	c->zstream.zalloc = Z_NULL;
319	c->zstream.zfree = Z_NULL;
320	c->zstream.opaque = Z_NULL;
321	zret = deflateInit(&c->zstream, lvl);
322	if (zret != Z_OK) {
323	av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
324	return -1;
325	}
326
327	avctx->coded_frame = av_frame_alloc();
328	if (!avctx->coded_frame) {
329	encode_end(avctx);
330	return AVERROR(ENOMEM);
331	}
332
333	return 0;
334	}
335
336	AVCodec ff_zmbv_encoder = {
337	.name = "zmbv",
338	.long_name = NULL_IF_CONFIG_SMALL("Zip Motion Blocks Video"),
339	.type = AVMEDIA_TYPE_VIDEO,
340	.id = AV_CODEC_ID_ZMBV,
341	.priv_data_size = sizeof(ZmbvEncContext),
342	.init = encode_init,
343	.encode2 = encode_frame,
344	.close = encode_end,
345	.pix_fmts = (const enum AVPixelFormat[]){ AV_PIX_FMT_PAL8, AV_PIX_FMT_NONE },
346	};