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

/*
 * MxPEG decoder
 * Copyright (c) 2011 Anatoly Nenashev
 *
 * 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
 * MxPEG decoder
 */

#include "internal.h"
#include "mjpeg.h"
#include "mjpegdec.h"

typedef struct MXpegDecodeContext {
    MJpegDecodeContext jpg;
    AVFrame *picture[2]; /* pictures array */
    int picture_index; /* index of current picture */
    int got_sof_data; /* true if SOF data successfully parsed */
    int got_mxm_bitmask; /* true if MXM bitmask available */
    uint8_t *mxm_bitmask; /* bitmask buffer */
    unsigned bitmask_size; /* size of bitmask */
    int has_complete_frame; /* true if has complete frame */
    uint8_t *completion_bitmask; /* completion bitmask of macroblocks */
    unsigned mb_width, mb_height; /* size of picture in MB's from MXM header */
} MXpegDecodeContext;

static av_cold int mxpeg_decode_end(AVCodecContext *avctx)
{
    MXpegDecodeContext *s = avctx->priv_data;
    MJpegDecodeContext *jpg = &s->jpg;
    int i;

    jpg->picture_ptr = NULL;
    ff_mjpeg_decode_end(avctx);

    for (i = 0; i < 2; ++i)
        av_frame_free(&s->picture[i]);

    s->bitmask_size = 0;
    av_freep(&s->mxm_bitmask);
    av_freep(&s->completion_bitmask);

    return 0;
}

static av_cold int mxpeg_decode_init(AVCodecContext *avctx)
{
    MXpegDecodeContext *s = avctx->priv_data;

    s->picture[0] = av_frame_alloc();
    s->picture[1] = av_frame_alloc();
    if (!s->picture[0] || !s->picture[1]) {
        mxpeg_decode_end(avctx);
        return AVERROR(ENOMEM);
    }

    s->jpg.picture_ptr      = s->picture[0];
    return ff_mjpeg_decode_init(avctx);
}

static int mxpeg_decode_app(MXpegDecodeContext *s,
                            const uint8_t *buf_ptr, int buf_size)
{
    int len;
    if (buf_size < 2)
        return 0;
    len = AV_RB16(buf_ptr);
    skip_bits(&s->jpg.gb, 8*FFMIN(len,buf_size));

    return 0;
}

static int mxpeg_decode_mxm(MXpegDecodeContext *s,
                            const uint8_t *buf_ptr, int buf_size)
{
    unsigned bitmask_size, mb_count;
    int i;

    s->mb_width  = AV_RL16(buf_ptr+4);
    s->mb_height = AV_RL16(buf_ptr+6);
    mb_count = s->mb_width * s->mb_height;

    bitmask_size = (mb_count + 7) >> 3;
    if (bitmask_size > buf_size - 12) {
        av_log(s->jpg.avctx, AV_LOG_ERROR,
               "MXM bitmask is not complete\n");
        return AVERROR(EINVAL);
    }

    if (s->bitmask_size != bitmask_size) {
        s->bitmask_size = 0;
        av_freep(&s->mxm_bitmask);
        s->mxm_bitmask = av_malloc(bitmask_size);
        if (!s->mxm_bitmask) {
            av_log(s->jpg.avctx, AV_LOG_ERROR,
                   "MXM bitmask memory allocation error\n");
            return AVERROR(ENOMEM);
        }

        av_freep(&s->completion_bitmask);
        s->completion_bitmask = av_mallocz(bitmask_size);
        if (!s->completion_bitmask) {
            av_log(s->jpg.avctx, AV_LOG_ERROR,
                   "Completion bitmask memory allocation error\n");
            return AVERROR(ENOMEM);
        }

        s->bitmask_size = bitmask_size;
    }

    memcpy(s->mxm_bitmask, buf_ptr + 12, bitmask_size);
    s->got_mxm_bitmask = 1;

    if (!s->has_complete_frame) {
        uint8_t completion_check = 0xFF;
        for (i = 0; i < bitmask_size; ++i) {
            s->completion_bitmask[i] |= s->mxm_bitmask[i];
            completion_check &= s->completion_bitmask[i];
        }
        s->has_complete_frame = !(completion_check ^ 0xFF);
    }

    return 0;
}

static int mxpeg_decode_com(MXpegDecodeContext *s,
                            const uint8_t *buf_ptr, int buf_size)
{
    int len, ret = 0;
    if (buf_size < 2)
        return 0;
    len = AV_RB16(buf_ptr);
    if (len > 14 && len <= buf_size && !strncmp(buf_ptr + 2, "MXM", 3)) {
        ret = mxpeg_decode_mxm(s, buf_ptr + 2, len - 2);
    }
    skip_bits(&s->jpg.gb, 8*FFMIN(len,buf_size));

    return ret;
}

static int mxpeg_check_dimensions(MXpegDecodeContext *s, MJpegDecodeContext *jpg,
                                  AVFrame *reference_ptr)
{
    if ((jpg->width + 0x0F)>>4 != s->mb_width ||
        (jpg->height + 0x0F)>>4 != s->mb_height) {
        av_log(jpg->avctx, AV_LOG_ERROR,
               "Picture dimensions stored in SOF and MXM mismatch\n");
        return AVERROR(EINVAL);
    }

    if (reference_ptr->data[0]) {
        int i;
        for (i = 0; i < MAX_COMPONENTS; ++i) {
            if ( (!reference_ptr->data[i] ^ !jpg->picture_ptr->data[i]) ||
                 reference_ptr->linesize[i] != jpg->picture_ptr->linesize[i]) {
                av_log(jpg->avctx, AV_LOG_ERROR,
                       "Dimensions of current and reference picture mismatch\n");
                return AVERROR(EINVAL);
            }
        }
    }

    return 0;
}

static int mxpeg_decode_frame(AVCodecContext *avctx,
                          void *data, int *got_frame,
                          AVPacket *avpkt)
{
    const uint8_t *buf = avpkt->data;
    int buf_size = avpkt->size;
    MXpegDecodeContext *s = avctx->priv_data;
    MJpegDecodeContext *jpg = &s->jpg;
    const uint8_t *buf_end, *buf_ptr;
    const uint8_t *unescaped_buf_ptr;
    int unescaped_buf_size;
    int start_code;
    int ret;

    buf_ptr = buf;
    buf_end = buf + buf_size;
    jpg->got_picture = 0;
    s->got_mxm_bitmask = 0;
    while (buf_ptr < buf_end) {
        start_code = ff_mjpeg_find_marker(jpg, &buf_ptr, buf_end,
                                          &unescaped_buf_ptr, &unescaped_buf_size);
        if (start_code < 0)
            goto the_end;
        {
            init_get_bits(&jpg->gb, unescaped_buf_ptr, unescaped_buf_size*8);

            if (start_code >= APP0 && start_code <= APP15) {
                mxpeg_decode_app(s, unescaped_buf_ptr, unescaped_buf_size);
            }

            switch (start_code) {
            case SOI:
                if (jpg->got_picture) //emulating EOI
                    goto the_end;
                break;
            case EOI:
                goto the_end;
            case DQT:
                ret = ff_mjpeg_decode_dqt(jpg);
                if (ret < 0) {
                    av_log(avctx, AV_LOG_ERROR,
                           "quantization table decode error\n");
                    return ret;
                }
                break;
            case DHT:
                ret = ff_mjpeg_decode_dht(jpg);
                if (ret < 0) {
                    av_log(avctx, AV_LOG_ERROR,
                           "huffman table decode error\n");
                    return ret;
                }
                break;
            case COM:
                ret = mxpeg_decode_com(s, unescaped_buf_ptr,
                                       unescaped_buf_size);
                if (ret < 0)
                    return ret;
                break;
            case SOF0:
                s->got_sof_data = 0;
                ret = ff_mjpeg_decode_sof(jpg);
                if (ret < 0) {
                    av_log(avctx, AV_LOG_ERROR,
                           "SOF data decode error\n");
                    return ret;
                }
                if (jpg->interlaced) {
                    av_log(avctx, AV_LOG_ERROR,
                           "Interlaced mode not supported in MxPEG\n");
                    return AVERROR(EINVAL);
                }
                s->got_sof_data = 1;
                break;
            case SOS:
                if (!s->got_sof_data) {
                    av_log(avctx, AV_LOG_WARNING,
                           "Can not process SOS without SOF data, skipping\n");
                    break;
                }
                if (!jpg->got_picture) {
                    if (jpg->first_picture) {
                        av_log(avctx, AV_LOG_WARNING,
                               "First picture has no SOF, skipping\n");
                        break;
                    }
                    if (!s->got_mxm_bitmask){
                        av_log(avctx, AV_LOG_WARNING,
                               "Non-key frame has no MXM, skipping\n");
                        break;
                    }
                    /* use stored SOF data to allocate current picture */
                    av_frame_unref(jpg->picture_ptr);
                    if ((ret = ff_get_buffer(avctx, jpg->picture_ptr,
                                             AV_GET_BUFFER_FLAG_REF)) < 0)
                        return ret;
                    jpg->picture_ptr->pict_type = AV_PICTURE_TYPE_P;
                    jpg->picture_ptr->key_frame = 0;
                    jpg->got_picture = 1;
                } else {
                    jpg->picture_ptr->pict_type = AV_PICTURE_TYPE_I;
                    jpg->picture_ptr->key_frame = 1;
                }

                if (s->got_mxm_bitmask) {
                    AVFrame *reference_ptr = s->picture[s->picture_index ^ 1];
                    if (mxpeg_check_dimensions(s, jpg, reference_ptr) < 0)
                        break;

                    /* allocate dummy reference picture if needed */
                    if (!reference_ptr->data[0] &&
                        (ret = ff_get_buffer(avctx, reference_ptr,
                                             AV_GET_BUFFER_FLAG_REF)) < 0)
                        return ret;

                    ret = ff_mjpeg_decode_sos(jpg, s->mxm_bitmask, s->bitmask_size, reference_ptr);
                    if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE))
                        return ret;
                } else {
                    ret = ff_mjpeg_decode_sos(jpg, NULL, 0, NULL);
                    if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE))
                        return ret;
                }

                break;
            }

            buf_ptr += (get_bits_count(&jpg->gb)+7) >> 3;
        }

    }

the_end:
    if (jpg->got_picture) {
        int ret = av_frame_ref(data, jpg->picture_ptr);
        if (ret < 0)
            return ret;
        *got_frame = 1;

        s->picture_index ^= 1;
        jpg->picture_ptr = s->picture[s->picture_index];

        if (!s->has_complete_frame) {
            if (!s->got_mxm_bitmask)
                s->has_complete_frame = 1;
            else
                *got_frame = 0;
        }
    }

    return buf_ptr - buf;
}

AVCodec ff_mxpeg_decoder = {
    .name           = "mxpeg",
    .long_name      = NULL_IF_CONFIG_SMALL("Mobotix MxPEG video"),
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = AV_CODEC_ID_MXPEG,
    .priv_data_size = sizeof(MXpegDecodeContext),
    .init           = mxpeg_decode_init,
    .close          = mxpeg_decode_end,
    .decode         = mxpeg_decode_frame,
    .capabilities   = CODEC_CAP_DR1,
    .max_lowres     = 3,
};
Commit	Line	Data
2ba45a60 DM	1	/*
	2	* MxPEG decoder
	3	* Copyright (c) 2011 Anatoly Nenashev
	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	/**
	24	* @file
	25	* MxPEG decoder
	26	*/
	27
	28	#include "internal.h"
	29	#include "mjpeg.h"
	30	#include "mjpegdec.h"
	31
	32	typedef struct MXpegDecodeContext {
	33	MJpegDecodeContext jpg;
	34	AVFrame picture[2]; / pictures array */
	35	int picture_index; /* index of current picture */
	36	int got_sof_data; /* true if SOF data successfully parsed */
	37	int got_mxm_bitmask; /* true if MXM bitmask available */
	38	uint8_t mxm_bitmask; / bitmask buffer */
	39	unsigned bitmask_size; /* size of bitmask */
	40	int has_complete_frame; /* true if has complete frame */
	41	uint8_t completion_bitmask; / completion bitmask of macroblocks */
	42	unsigned mb_width, mb_height; /* size of picture in MB's from MXM header */
	43	} MXpegDecodeContext;
	44
	45	static av_cold int mxpeg_decode_end(AVCodecContext *avctx)
	46	{
	47	MXpegDecodeContext *s = avctx->priv_data;
	48	MJpegDecodeContext *jpg = &s->jpg;
	49	int i;
	50
	51	jpg->picture_ptr = NULL;
	52	ff_mjpeg_decode_end(avctx);
	53
	54	for (i = 0; i < 2; ++i)
	55	av_frame_free(&s->picture[i]);
	56
	57	s->bitmask_size = 0;
	58	av_freep(&s->mxm_bitmask);
	59	av_freep(&s->completion_bitmask);
	60
	61	return 0;
	62	}
	63
	64	static av_cold int mxpeg_decode_init(AVCodecContext *avctx)
65	{
66	MXpegDecodeContext *s = avctx->priv_data;
67
68	s->picture[0] = av_frame_alloc();
69	s->picture[1] = av_frame_alloc();
70	if (!s->picture[0] \|\| !s->picture[1]) {
71	mxpeg_decode_end(avctx);
72	return AVERROR(ENOMEM);
73	}
74
75	s->jpg.picture_ptr = s->picture[0];
76	return ff_mjpeg_decode_init(avctx);
77	}
78
79	static int mxpeg_decode_app(MXpegDecodeContext *s,
80	const uint8_t *buf_ptr, int buf_size)
81	{
82	int len;
83	if (buf_size < 2)
84	return 0;
85	len = AV_RB16(buf_ptr);
86	skip_bits(&s->jpg.gb, 8*FFMIN(len,buf_size));
87
88	return 0;
89	}
90
91	static int mxpeg_decode_mxm(MXpegDecodeContext *s,
92	const uint8_t *buf_ptr, int buf_size)
93	{
94	unsigned bitmask_size, mb_count;
95	int i;
96
97	s->mb_width = AV_RL16(buf_ptr+4);
98	s->mb_height = AV_RL16(buf_ptr+6);
99	mb_count = s->mb_width * s->mb_height;
100
101	bitmask_size = (mb_count + 7) >> 3;
102	if (bitmask_size > buf_size - 12) {
103	av_log(s->jpg.avctx, AV_LOG_ERROR,
104	"MXM bitmask is not complete\n");
105	return AVERROR(EINVAL);
106	}
107
108	if (s->bitmask_size != bitmask_size) {
109	s->bitmask_size = 0;
110	av_freep(&s->mxm_bitmask);
111	s->mxm_bitmask = av_malloc(bitmask_size);
112	if (!s->mxm_bitmask) {
113	av_log(s->jpg.avctx, AV_LOG_ERROR,
114	"MXM bitmask memory allocation error\n");
115	return AVERROR(ENOMEM);
116	}
117
118	av_freep(&s->completion_bitmask);
119	s->completion_bitmask = av_mallocz(bitmask_size);
120	if (!s->completion_bitmask) {
121	av_log(s->jpg.avctx, AV_LOG_ERROR,
122	"Completion bitmask memory allocation error\n");
123	return AVERROR(ENOMEM);
124	}
125
126	s->bitmask_size = bitmask_size;
127	}
128
129	memcpy(s->mxm_bitmask, buf_ptr + 12, bitmask_size);
130	s->got_mxm_bitmask = 1;
131
132	if (!s->has_complete_frame) {
133	uint8_t completion_check = 0xFF;
134	for (i = 0; i < bitmask_size; ++i) {
135	s->completion_bitmask[i] \|= s->mxm_bitmask[i];
136	completion_check &= s->completion_bitmask[i];
137	}
138	s->has_complete_frame = !(completion_check ^ 0xFF);
139	}
140
141	return 0;
142	}
143
144	static int mxpeg_decode_com(MXpegDecodeContext *s,
145	const uint8_t *buf_ptr, int buf_size)
146	{
147	int len, ret = 0;
148	if (buf_size < 2)
149	return 0;
150	len = AV_RB16(buf_ptr);
151	if (len > 14 && len <= buf_size && !strncmp(buf_ptr + 2, "MXM", 3)) {
152	ret = mxpeg_decode_mxm(s, buf_ptr + 2, len - 2);
153	}
154	skip_bits(&s->jpg.gb, 8*FFMIN(len,buf_size));
155
156	return ret;
157	}
158
159	static int mxpeg_check_dimensions(MXpegDecodeContext s, MJpegDecodeContext jpg,
160	AVFrame *reference_ptr)
161	{
162	if ((jpg->width + 0x0F)>>4 != s->mb_width \|\|
163	(jpg->height + 0x0F)>>4 != s->mb_height) {
164	av_log(jpg->avctx, AV_LOG_ERROR,
165	"Picture dimensions stored in SOF and MXM mismatch\n");
166	return AVERROR(EINVAL);
167	}
168
169	if (reference_ptr->data[0]) {
170	int i;
171	for (i = 0; i < MAX_COMPONENTS; ++i) {
172	if ( (!reference_ptr->data[i] ^ !jpg->picture_ptr->data[i]) \|\|
173	reference_ptr->linesize[i] != jpg->picture_ptr->linesize[i]) {
174	av_log(jpg->avctx, AV_LOG_ERROR,
175	"Dimensions of current and reference picture mismatch\n");
176	return AVERROR(EINVAL);
177	}
178	}
179	}
180
181	return 0;
182	}
183
184	static int mxpeg_decode_frame(AVCodecContext *avctx,
185	void data, int got_frame,
186	AVPacket *avpkt)
187	{
188	const uint8_t *buf = avpkt->data;
189	int buf_size = avpkt->size;
190	MXpegDecodeContext *s = avctx->priv_data;
191	MJpegDecodeContext *jpg = &s->jpg;
192	const uint8_t buf_end, buf_ptr;
193	const uint8_t *unescaped_buf_ptr;
194	int unescaped_buf_size;
195	int start_code;
196	int ret;
197
198	buf_ptr = buf;
199	buf_end = buf + buf_size;
200	jpg->got_picture = 0;
201	s->got_mxm_bitmask = 0;
202	while (buf_ptr < buf_end) {
203	start_code = ff_mjpeg_find_marker(jpg, &buf_ptr, buf_end,
204	&unescaped_buf_ptr, &unescaped_buf_size);
205	if (start_code < 0)
206	goto the_end;
207	{
208	init_get_bits(&jpg->gb, unescaped_buf_ptr, unescaped_buf_size*8);
209
210	if (start_code >= APP0 && start_code <= APP15) {
211	mxpeg_decode_app(s, unescaped_buf_ptr, unescaped_buf_size);
212	}
213
214	switch (start_code) {
215	case SOI:
216	if (jpg->got_picture) //emulating EOI
217	goto the_end;
218	break;
219	case EOI:
220	goto the_end;
221	case DQT:
222	ret = ff_mjpeg_decode_dqt(jpg);
223	if (ret < 0) {
224	av_log(avctx, AV_LOG_ERROR,
225	"quantization table decode error\n");
226	return ret;
227	}
228	break;
229	case DHT:
230	ret = ff_mjpeg_decode_dht(jpg);
231	if (ret < 0) {
232	av_log(avctx, AV_LOG_ERROR,
233	"huffman table decode error\n");
234	return ret;
235	}
236	break;
237	case COM:
238	ret = mxpeg_decode_com(s, unescaped_buf_ptr,
239	unescaped_buf_size);
240	if (ret < 0)
241	return ret;
242	break;
243	case SOF0:
244	s->got_sof_data = 0;
245	ret = ff_mjpeg_decode_sof(jpg);
246	if (ret < 0) {
247	av_log(avctx, AV_LOG_ERROR,
248	"SOF data decode error\n");
249	return ret;
250	}
251	if (jpg->interlaced) {
252	av_log(avctx, AV_LOG_ERROR,
253	"Interlaced mode not supported in MxPEG\n");
254	return AVERROR(EINVAL);
255	}
256	s->got_sof_data = 1;
257	break;
258	case SOS:
259	if (!s->got_sof_data) {
260	av_log(avctx, AV_LOG_WARNING,
261	"Can not process SOS without SOF data, skipping\n");
262	break;
263	}
264	if (!jpg->got_picture) {
265	if (jpg->first_picture) {
266	av_log(avctx, AV_LOG_WARNING,
267	"First picture has no SOF, skipping\n");
268	break;
269	}
270	if (!s->got_mxm_bitmask){
271	av_log(avctx, AV_LOG_WARNING,
272	"Non-key frame has no MXM, skipping\n");
273	break;
274	}
275	/* use stored SOF data to allocate current picture */
276	av_frame_unref(jpg->picture_ptr);
277	if ((ret = ff_get_buffer(avctx, jpg->picture_ptr,
278	AV_GET_BUFFER_FLAG_REF)) < 0)
279	return ret;
280	jpg->picture_ptr->pict_type = AV_PICTURE_TYPE_P;
281	jpg->picture_ptr->key_frame = 0;
282	jpg->got_picture = 1;
283	} else {
284	jpg->picture_ptr->pict_type = AV_PICTURE_TYPE_I;
285	jpg->picture_ptr->key_frame = 1;
286	}
287
288	if (s->got_mxm_bitmask) {
289	AVFrame *reference_ptr = s->picture[s->picture_index ^ 1];
290	if (mxpeg_check_dimensions(s, jpg, reference_ptr) < 0)
291	break;
292
293	/* allocate dummy reference picture if needed */
294	if (!reference_ptr->data[0] &&
295	(ret = ff_get_buffer(avctx, reference_ptr,
296	AV_GET_BUFFER_FLAG_REF)) < 0)
297	return ret;
298
299	ret = ff_mjpeg_decode_sos(jpg, s->mxm_bitmask, s->bitmask_size, reference_ptr);
300	if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE))
301	return ret;
302	} else {
303	ret = ff_mjpeg_decode_sos(jpg, NULL, 0, NULL);
304	if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE))
305	return ret;
306	}
307
308	break;
309	}
310
311	buf_ptr += (get_bits_count(&jpg->gb)+7) >> 3;
312	}
313
314	}
315
316	the_end:
317	if (jpg->got_picture) {
318	int ret = av_frame_ref(data, jpg->picture_ptr);
319	if (ret < 0)
320	return ret;
321	*got_frame = 1;
322
323	s->picture_index ^= 1;
324	jpg->picture_ptr = s->picture[s->picture_index];
325
326	if (!s->has_complete_frame) {
327	if (!s->got_mxm_bitmask)
328	s->has_complete_frame = 1;
329	else
330	*got_frame = 0;
331	}
332	}
333
334	return buf_ptr - buf;
335	}
336
337	AVCodec ff_mxpeg_decoder = {
338	.name = "mxpeg",
339	.long_name = NULL_IF_CONFIG_SMALL("Mobotix MxPEG video"),
340	.type = AVMEDIA_TYPE_VIDEO,
341	.id = AV_CODEC_ID_MXPEG,
342	.priv_data_size = sizeof(MXpegDecodeContext),
343	.init = mxpeg_decode_init,
344	.close = mxpeg_decode_end,
345	.decode = mxpeg_decode_frame,
346	.capabilities = CODEC_CAP_DR1,
347	.max_lowres = 3,
348	};