[deb_ffmpeg.git] / ffmpeg / libavcodec / escape124.c

/*
 * Escape 124 Video Decoder
 * Copyright (C) 2008 Eli Friedman (eli.friedman@gmail.com)
 *
 * 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
 */

#include "avcodec.h"
#include "internal.h"

#define BITSTREAM_READER_LE
#include "get_bits.h"

typedef union MacroBlock {
    uint16_t pixels[4];
    uint32_t pixels32[2];
} MacroBlock;

typedef union SuperBlock {
    uint16_t pixels[64];
    uint32_t pixels32[32];
} SuperBlock;

typedef struct CodeBook {
    unsigned depth;
    unsigned size;
    MacroBlock* blocks;
} CodeBook;

typedef struct Escape124Context {
    AVFrame *frame;

    unsigned num_superblocks;

    CodeBook codebooks[3];
} Escape124Context;

/**
 * Initialize the decoder
 * @param avctx decoder context
 * @return 0 success, negative on error
 */
static av_cold int escape124_decode_init(AVCodecContext *avctx)
{
    Escape124Context *s = avctx->priv_data;

    avctx->pix_fmt = AV_PIX_FMT_RGB555;

    s->num_superblocks = ((unsigned)avctx->width / 8) *
                         ((unsigned)avctx->height / 8);

    s->frame = av_frame_alloc();
    if (!s->frame)
        return AVERROR(ENOMEM);

    return 0;
}

static av_cold int escape124_decode_close(AVCodecContext *avctx)
{
    unsigned i;
    Escape124Context *s = avctx->priv_data;

    for (i = 0; i < 3; i++)
        av_free(s->codebooks[i].blocks);

    av_frame_free(&s->frame);

    return 0;
}

static CodeBook unpack_codebook(GetBitContext* gb, unsigned depth,
                                 unsigned size)
{
    unsigned i, j;
    CodeBook cb = { 0 };

    if (size >= INT_MAX / 34 || get_bits_left(gb) < size * 34)
        return cb;

    if (size >= INT_MAX / sizeof(MacroBlock))
        return cb;
    cb.blocks = av_malloc(size ? size * sizeof(MacroBlock) : 1);
    if (!cb.blocks)
        return cb;

    cb.depth = depth;
    cb.size = size;
    for (i = 0; i < size; i++) {
        unsigned mask_bits = get_bits(gb, 4);
        unsigned color0 = get_bits(gb, 15);
        unsigned color1 = get_bits(gb, 15);

        for (j = 0; j < 4; j++) {
            if (mask_bits & (1 << j))
                cb.blocks[i].pixels[j] = color1;
            else
                cb.blocks[i].pixels[j] = color0;
        }
    }
    return cb;
}

static unsigned decode_skip_count(GetBitContext* gb)
{
    unsigned value;
    // This function reads a maximum of 23 bits,
    // which is within the padding space
    if (get_bits_left(gb) < 1)
        return -1;
    value = get_bits1(gb);
    if (!value)
        return value;

    value += get_bits(gb, 3);
    if (value != (1 + ((1 << 3) - 1)))
        return value;

    value += get_bits(gb, 7);
    if (value != (1 + ((1 << 3) - 1)) + ((1 << 7) - 1))
        return value;

    return value + get_bits(gb, 12);
}

static MacroBlock decode_macroblock(Escape124Context* s, GetBitContext* gb,
                                    int* codebook_index, int superblock_index)
{
    // This function reads a maximum of 22 bits; the callers
    // guard this function appropriately
    unsigned block_index, depth;

    if (get_bits1(gb)) {
        static const char transitions[3][2] = { {2, 1}, {0, 2}, {1, 0} };
        *codebook_index = transitions[*codebook_index][get_bits1(gb)];
    }

    depth = s->codebooks[*codebook_index].depth;

    // depth = 0 means that this shouldn't read any bits;
    // in theory, this is the same as get_bits(gb, 0), but
    // that doesn't actually work.
    block_index = depth ? get_bits(gb, depth) : 0;

    if (*codebook_index == 1) {
        block_index += superblock_index << s->codebooks[1].depth;
    }

    // This condition can occur with invalid bitstreams and
    // *codebook_index == 2
    if (block_index >= s->codebooks[*codebook_index].size)
        return (MacroBlock) { { 0 } };

    return s->codebooks[*codebook_index].blocks[block_index];
}

static void insert_mb_into_sb(SuperBlock* sb, MacroBlock mb, unsigned index) {
   // Formula: ((index / 4) * 16 + (index % 4) * 2) / 2
   uint32_t *dst = sb->pixels32 + index + (index & -4);

   // This technically violates C99 aliasing rules, but it should be safe.
   dst[0] = mb.pixels32[0];
   dst[4] = mb.pixels32[1];
}

static void copy_superblock(uint16_t* dest, unsigned dest_stride,
                            uint16_t* src, unsigned src_stride)
{
    unsigned y;
    if (src)
        for (y = 0; y < 8; y++)
            memcpy(dest + y * dest_stride, src + y * src_stride,
                   sizeof(uint16_t) * 8);
    else
        for (y = 0; y < 8; y++)
            memset(dest + y * dest_stride, 0, sizeof(uint16_t) * 8);
}

static const uint16_t mask_matrix[] = {0x1,   0x2,   0x10,   0x20,
                                       0x4,   0x8,   0x40,   0x80,
                                       0x100, 0x200, 0x1000, 0x2000,
                                       0x400, 0x800, 0x4000, 0x8000};

static int escape124_decode_frame(AVCodecContext *avctx,
                                  void *data, int *got_frame,
                                  AVPacket *avpkt)
{
    int buf_size = avpkt->size;
    Escape124Context *s = avctx->priv_data;
    AVFrame *frame = data;

    GetBitContext gb;
    unsigned frame_flags, frame_size;
    unsigned i;

    unsigned superblock_index, cb_index = 1,
             superblock_col_index = 0,
             superblocks_per_row = avctx->width / 8, skip = -1;

    uint16_t* old_frame_data, *new_frame_data;
    unsigned old_stride, new_stride;

    int ret;

    if ((ret = init_get_bits8(&gb, avpkt->data, avpkt->size)) < 0)
        return ret;

    // This call also guards the potential depth reads for the
    // codebook unpacking.
    if (get_bits_left(&gb) < 64)
        return -1;

    frame_flags = get_bits_long(&gb, 32);
    frame_size  = get_bits_long(&gb, 32);

    // Leave last frame unchanged
    // FIXME: Is this necessary?  I haven't seen it in any real samples
    if (!(frame_flags & 0x114) || !(frame_flags & 0x7800000)) {
        if (!s->frame->data[0])
            return AVERROR_INVALIDDATA;

        av_log(avctx, AV_LOG_DEBUG, "Skipping frame\n");

        *got_frame = 1;
        if ((ret = av_frame_ref(frame, s->frame)) < 0)
            return ret;

        return frame_size;
    }

    for (i = 0; i < 3; i++) {
        if (frame_flags & (1 << (17 + i))) {
            unsigned cb_depth, cb_size;
            if (i == 2) {
                // This codebook can be cut off at places other than
                // powers of 2, leaving some of the entries undefined.
                cb_size = get_bits_long(&gb, 20);
                cb_depth = av_log2(cb_size - 1) + 1;
            } else {
                cb_depth = get_bits(&gb, 4);
                if (i == 0) {
                    // This is the most basic codebook: pow(2,depth) entries
                    // for a depth-length key
                    cb_size = 1 << cb_depth;
                } else {
                    // This codebook varies per superblock
                    // FIXME: I don't think this handles integer overflow
                    // properly
                    cb_size = s->num_superblocks << cb_depth;
                }
            }
            av_free(s->codebooks[i].blocks);
            s->codebooks[i] = unpack_codebook(&gb, cb_depth, cb_size);
            if (!s->codebooks[i].blocks)
                return -1;
        }
    }

    if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)
        return ret;

    new_frame_data = (uint16_t*)frame->data[0];
    new_stride = frame->linesize[0] / 2;
    old_frame_data = (uint16_t*)s->frame->data[0];
    old_stride = s->frame->linesize[0] / 2;

    for (superblock_index = 0; superblock_index < s->num_superblocks;
         superblock_index++) {
        MacroBlock mb;
        SuperBlock sb;
        unsigned multi_mask = 0;

        if (skip == -1) {
            // Note that this call will make us skip the rest of the blocks
            // if the frame prematurely ends
            skip = decode_skip_count(&gb);
        }

        if (skip) {
            copy_superblock(new_frame_data, new_stride,
                            old_frame_data, old_stride);
        } else {
            copy_superblock(sb.pixels, 8,
                            old_frame_data, old_stride);

            while (get_bits_left(&gb) >= 1 && !get_bits1(&gb)) {
                unsigned mask;
                mb = decode_macroblock(s, &gb, &cb_index, superblock_index);
                mask = get_bits(&gb, 16);
                multi_mask |= mask;
                for (i = 0; i < 16; i++) {
                    if (mask & mask_matrix[i]) {
                        insert_mb_into_sb(&sb, mb, i);
                    }
                }
            }

            if (!get_bits1(&gb)) {
                unsigned inv_mask = get_bits(&gb, 4);
                for (i = 0; i < 4; i++) {
                    if (inv_mask & (1 << i)) {
                        multi_mask ^= 0xF << i*4;
                    } else {
                        multi_mask ^= get_bits(&gb, 4) << i*4;
                    }
                }

                for (i = 0; i < 16; i++) {
                    if (multi_mask & mask_matrix[i]) {
                        mb = decode_macroblock(s, &gb, &cb_index,
                                               superblock_index);
                        insert_mb_into_sb(&sb, mb, i);
                    }
                }
            } else if (frame_flags & (1 << 16)) {
                while (get_bits_left(&gb) >= 1 && !get_bits1(&gb)) {
                    mb = decode_macroblock(s, &gb, &cb_index, superblock_index);
                    insert_mb_into_sb(&sb, mb, get_bits(&gb, 4));
                }
            }

            copy_superblock(new_frame_data, new_stride, sb.pixels, 8);
        }

        superblock_col_index++;
        new_frame_data += 8;
        if (old_frame_data)
            old_frame_data += 8;
        if (superblock_col_index == superblocks_per_row) {
            new_frame_data += new_stride * 8 - superblocks_per_row * 8;
            if (old_frame_data)
                old_frame_data += old_stride * 8 - superblocks_per_row * 8;
            superblock_col_index = 0;
        }
        skip--;
    }

    av_log(avctx, AV_LOG_DEBUG,
           "Escape sizes: %i, %i, %i\n",
           frame_size, buf_size, get_bits_count(&gb) / 8);

    av_frame_unref(s->frame);
    if ((ret = av_frame_ref(s->frame, frame)) < 0)
        return ret;

    *got_frame = 1;

    return frame_size;
}


AVCodec ff_escape124_decoder = {
    .name           = "escape124",
    .long_name      = NULL_IF_CONFIG_SMALL("Escape 124"),
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = AV_CODEC_ID_ESCAPE124,
    .priv_data_size = sizeof(Escape124Context),
    .init           = escape124_decode_init,
    .close          = escape124_decode_close,
    .decode         = escape124_decode_frame,
    .capabilities   = CODEC_CAP_DR1,
};
Commit	Line	Data
2ba45a60 DM	1	/*
	2	* Escape 124 Video Decoder
	3	* Copyright (C) 2008 Eli Friedman (eli.friedman@gmail.com)
	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	#include "avcodec.h"
	23	#include "internal.h"
	24
	25	#define BITSTREAM_READER_LE
	26	#include "get_bits.h"
	27
	28	typedef union MacroBlock {
	29	uint16_t pixels[4];
	30	uint32_t pixels32[2];
	31	} MacroBlock;
	32
	33	typedef union SuperBlock {
	34	uint16_t pixels[64];
	35	uint32_t pixels32[32];
	36	} SuperBlock;
	37
	38	typedef struct CodeBook {
	39	unsigned depth;
	40	unsigned size;
	41	MacroBlock* blocks;
	42	} CodeBook;
	43
	44	typedef struct Escape124Context {
	45	AVFrame *frame;
	46
	47	unsigned num_superblocks;
	48
	49	CodeBook codebooks[3];
	50	} Escape124Context;
	51
	52	/**
	53	* Initialize the decoder
	54	* @param avctx decoder context
	55	* @return 0 success, negative on error
	56	*/
	57	static av_cold int escape124_decode_init(AVCodecContext *avctx)
	58	{
	59	Escape124Context *s = avctx->priv_data;
	60
	61	avctx->pix_fmt = AV_PIX_FMT_RGB555;
	62
	63	s->num_superblocks = ((unsigned)avctx->width / 8) *
	64	((unsigned)avctx->height / 8);
65
66	s->frame = av_frame_alloc();
67	if (!s->frame)
68	return AVERROR(ENOMEM);
69
70	return 0;
71	}
72
73	static av_cold int escape124_decode_close(AVCodecContext *avctx)
74	{
75	unsigned i;
76	Escape124Context *s = avctx->priv_data;
77
78	for (i = 0; i < 3; i++)
79	av_free(s->codebooks[i].blocks);
80
81	av_frame_free(&s->frame);
82
83	return 0;
84	}
85
86	static CodeBook unpack_codebook(GetBitContext* gb, unsigned depth,
87	unsigned size)
88	{
89	unsigned i, j;
90	CodeBook cb = { 0 };
91
92	if (size >= INT_MAX / 34 \|\| get_bits_left(gb) < size * 34)
93	return cb;
94
95	if (size >= INT_MAX / sizeof(MacroBlock))
96	return cb;
97	cb.blocks = av_malloc(size ? size * sizeof(MacroBlock) : 1);
98	if (!cb.blocks)
99	return cb;
100
101	cb.depth = depth;
102	cb.size = size;
103	for (i = 0; i < size; i++) {
104	unsigned mask_bits = get_bits(gb, 4);
105	unsigned color0 = get_bits(gb, 15);
106	unsigned color1 = get_bits(gb, 15);
107
108	for (j = 0; j < 4; j++) {
109	if (mask_bits & (1 << j))
110	cb.blocks[i].pixels[j] = color1;
111	else
112	cb.blocks[i].pixels[j] = color0;
113	}
114	}
115	return cb;
116	}
117
118	static unsigned decode_skip_count(GetBitContext* gb)
119	{
120	unsigned value;
121	// This function reads a maximum of 23 bits,
122	// which is within the padding space
123	if (get_bits_left(gb) < 1)
124	return -1;
125	value = get_bits1(gb);
126	if (!value)
127	return value;
128
129	value += get_bits(gb, 3);
130	if (value != (1 + ((1 << 3) - 1)))
131	return value;
132
133	value += get_bits(gb, 7);
134	if (value != (1 + ((1 << 3) - 1)) + ((1 << 7) - 1))
135	return value;
136
137	return value + get_bits(gb, 12);
138	}
139
140	static MacroBlock decode_macroblock(Escape124Context* s, GetBitContext* gb,
141	int* codebook_index, int superblock_index)
142	{
143	// This function reads a maximum of 22 bits; the callers
144	// guard this function appropriately
145	unsigned block_index, depth;
146
147	if (get_bits1(gb)) {
148	static const char transitions[3][2] = { {2, 1}, {0, 2}, {1, 0} };
149	codebook_index = transitions[codebook_index][get_bits1(gb)];
150	}
151
152	depth = s->codebooks[*codebook_index].depth;
153
154	// depth = 0 means that this shouldn't read any bits;
155	// in theory, this is the same as get_bits(gb, 0), but
156	// that doesn't actually work.
157	block_index = depth ? get_bits(gb, depth) : 0;
158
159	if (*codebook_index == 1) {
160	block_index += superblock_index << s->codebooks[1].depth;
161	}
162
163	// This condition can occur with invalid bitstreams and
164	// *codebook_index == 2
165	if (block_index >= s->codebooks[*codebook_index].size)
166	return (MacroBlock) { { 0 } };
167
168	return s->codebooks[*codebook_index].blocks[block_index];
169	}
170
171	static void insert_mb_into_sb(SuperBlock* sb, MacroBlock mb, unsigned index) {
172	// Formula: ((index / 4) * 16 + (index % 4) * 2) / 2
173	uint32_t *dst = sb->pixels32 + index + (index & -4);
174
175	// This technically violates C99 aliasing rules, but it should be safe.
176	dst[0] = mb.pixels32[0];
177	dst[4] = mb.pixels32[1];
178	}
179
180	static void copy_superblock(uint16_t* dest, unsigned dest_stride,
181	uint16_t* src, unsigned src_stride)
182	{
183	unsigned y;
184	if (src)
185	for (y = 0; y < 8; y++)
186	memcpy(dest + y * dest_stride, src + y * src_stride,
187	sizeof(uint16_t) * 8);
188	else
189	for (y = 0; y < 8; y++)
190	memset(dest + y * dest_stride, 0, sizeof(uint16_t) * 8);
191	}
192
193	static const uint16_t mask_matrix[] = {0x1, 0x2, 0x10, 0x20,
194	0x4, 0x8, 0x40, 0x80,
195	0x100, 0x200, 0x1000, 0x2000,
196	0x400, 0x800, 0x4000, 0x8000};
197
198	static int escape124_decode_frame(AVCodecContext *avctx,
199	void data, int got_frame,
200	AVPacket *avpkt)
201	{
202	int buf_size = avpkt->size;
203	Escape124Context *s = avctx->priv_data;
204	AVFrame *frame = data;
205
206	GetBitContext gb;
207	unsigned frame_flags, frame_size;
208	unsigned i;
209
210	unsigned superblock_index, cb_index = 1,
211	superblock_col_index = 0,
212	superblocks_per_row = avctx->width / 8, skip = -1;
213
214	uint16_t* old_frame_data, *new_frame_data;
215	unsigned old_stride, new_stride;
216
217	int ret;
218
219	if ((ret = init_get_bits8(&gb, avpkt->data, avpkt->size)) < 0)
220	return ret;
221
222	// This call also guards the potential depth reads for the
223	// codebook unpacking.
224	if (get_bits_left(&gb) < 64)
225	return -1;
226
227	frame_flags = get_bits_long(&gb, 32);
228	frame_size = get_bits_long(&gb, 32);
229
230	// Leave last frame unchanged
231	// FIXME: Is this necessary? I haven't seen it in any real samples
232	if (!(frame_flags & 0x114) \|\| !(frame_flags & 0x7800000)) {
233	if (!s->frame->data[0])
234	return AVERROR_INVALIDDATA;
235
236	av_log(avctx, AV_LOG_DEBUG, "Skipping frame\n");
237
238	*got_frame = 1;
239	if ((ret = av_frame_ref(frame, s->frame)) < 0)
240	return ret;
241
242	return frame_size;
243	}
244
245	for (i = 0; i < 3; i++) {
246	if (frame_flags & (1 << (17 + i))) {
247	unsigned cb_depth, cb_size;
248	if (i == 2) {
249	// This codebook can be cut off at places other than
250	// powers of 2, leaving some of the entries undefined.
251	cb_size = get_bits_long(&gb, 20);
252	cb_depth = av_log2(cb_size - 1) + 1;
253	} else {
254	cb_depth = get_bits(&gb, 4);
255	if (i == 0) {
256	// This is the most basic codebook: pow(2,depth) entries
257	// for a depth-length key
258	cb_size = 1 << cb_depth;
259	} else {
260	// This codebook varies per superblock
261	// FIXME: I don't think this handles integer overflow
262	// properly
263	cb_size = s->num_superblocks << cb_depth;
264	}
265	}
266	av_free(s->codebooks[i].blocks);
267	s->codebooks[i] = unpack_codebook(&gb, cb_depth, cb_size);
268	if (!s->codebooks[i].blocks)
269	return -1;
270	}
271	}
272
273	if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)
274	return ret;
275
276	new_frame_data = (uint16_t*)frame->data[0];
277	new_stride = frame->linesize[0] / 2;
278	old_frame_data = (uint16_t*)s->frame->data[0];
279	old_stride = s->frame->linesize[0] / 2;
280
281	for (superblock_index = 0; superblock_index < s->num_superblocks;
282	superblock_index++) {
283	MacroBlock mb;
284	SuperBlock sb;
285	unsigned multi_mask = 0;
286
287	if (skip == -1) {
288	// Note that this call will make us skip the rest of the blocks
289	// if the frame prematurely ends
290	skip = decode_skip_count(&gb);
291	}
292
293	if (skip) {
294	copy_superblock(new_frame_data, new_stride,
295	old_frame_data, old_stride);
296	} else {
297	copy_superblock(sb.pixels, 8,
298	old_frame_data, old_stride);
299
300	while (get_bits_left(&gb) >= 1 && !get_bits1(&gb)) {
301	unsigned mask;
302	mb = decode_macroblock(s, &gb, &cb_index, superblock_index);
303	mask = get_bits(&gb, 16);
304	multi_mask \|= mask;
305	for (i = 0; i < 16; i++) {
306	if (mask & mask_matrix[i]) {
307	insert_mb_into_sb(&sb, mb, i);
308	}
309	}
310	}
311
312	if (!get_bits1(&gb)) {
313	unsigned inv_mask = get_bits(&gb, 4);
314	for (i = 0; i < 4; i++) {
315	if (inv_mask & (1 << i)) {
316	multi_mask ^= 0xF << i*4;
317	} else {
318	multi_mask ^= get_bits(&gb, 4) << i*4;
319	}
320	}
321
322	for (i = 0; i < 16; i++) {
323	if (multi_mask & mask_matrix[i]) {
324	mb = decode_macroblock(s, &gb, &cb_index,
325	superblock_index);
326	insert_mb_into_sb(&sb, mb, i);
327	}
328	}
329	} else if (frame_flags & (1 << 16)) {
330	while (get_bits_left(&gb) >= 1 && !get_bits1(&gb)) {
331	mb = decode_macroblock(s, &gb, &cb_index, superblock_index);
332	insert_mb_into_sb(&sb, mb, get_bits(&gb, 4));
333	}
334	}
335
336	copy_superblock(new_frame_data, new_stride, sb.pixels, 8);
337	}
338
339	superblock_col_index++;
340	new_frame_data += 8;
341	if (old_frame_data)
342	old_frame_data += 8;
343	if (superblock_col_index == superblocks_per_row) {
344	new_frame_data += new_stride * 8 - superblocks_per_row * 8;
345	if (old_frame_data)
346	old_frame_data += old_stride * 8 - superblocks_per_row * 8;
347	superblock_col_index = 0;
348	}
349	skip--;
350	}
351
352	av_log(avctx, AV_LOG_DEBUG,
353	"Escape sizes: %i, %i, %i\n",
354	frame_size, buf_size, get_bits_count(&gb) / 8);
355
356	av_frame_unref(s->frame);
357	if ((ret = av_frame_ref(s->frame, frame)) < 0)
358	return ret;
359
360	*got_frame = 1;
361
362	return frame_size;
363	}
364
365
366	AVCodec ff_escape124_decoder = {
367	.name = "escape124",
368	.long_name = NULL_IF_CONFIG_SMALL("Escape 124"),
369	.type = AVMEDIA_TYPE_VIDEO,
370	.id = AV_CODEC_ID_ESCAPE124,
371	.priv_data_size = sizeof(Escape124Context),
372	.init = escape124_decode_init,
373	.close = escape124_decode_close,
374	.decode = escape124_decode_frame,
375	.capabilities = CODEC_CAP_DR1,
376	};