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

/*
 * Motion Pixels Video Decoder
 * Copyright (c) 2008 Gregory Montoir (cyx@users.sourceforge.net)
 *
 * 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 "get_bits.h"
#include "bswapdsp.h"
#include "internal.h"

#define MAX_HUFF_CODES 16

#include "motionpixels_tablegen.h"

typedef struct HuffCode {
    int code;
    uint8_t size;
    uint8_t delta;
} HuffCode;

typedef struct MotionPixelsContext {
    AVCodecContext *avctx;
    AVFrame *frame;
    BswapDSPContext bdsp;
    uint8_t *changes_map;
    int offset_bits_len;
    int codes_count, current_codes_count;
    int max_codes_bits;
    HuffCode codes[MAX_HUFF_CODES];
    VLC vlc;
    YuvPixel *vpt, *hpt;
    uint8_t gradient_scale[3];
    uint8_t *bswapbuf;
    int bswapbuf_size;
} MotionPixelsContext;

static av_cold int mp_decode_end(AVCodecContext *avctx)
{
    MotionPixelsContext *mp = avctx->priv_data;

    av_freep(&mp->changes_map);
    av_freep(&mp->vpt);
    av_freep(&mp->hpt);
    av_freep(&mp->bswapbuf);
    av_frame_free(&mp->frame);

    return 0;
}

static av_cold int mp_decode_init(AVCodecContext *avctx)
{
    MotionPixelsContext *mp = avctx->priv_data;
    int w4 = (avctx->width  + 3) & ~3;
    int h4 = (avctx->height + 3) & ~3;

    if(avctx->extradata_size < 2){
        av_log(avctx, AV_LOG_ERROR, "extradata too small\n");
        return AVERROR_INVALIDDATA;
    }

    motionpixels_tableinit();
    mp->avctx = avctx;
    ff_bswapdsp_init(&mp->bdsp);
    mp->changes_map = av_mallocz_array(avctx->width, h4);
    mp->offset_bits_len = av_log2(avctx->width * avctx->height) + 1;
    mp->vpt = av_mallocz_array(avctx->height, sizeof(YuvPixel));
    mp->hpt = av_mallocz_array(h4 / 4, w4 / 4 * sizeof(YuvPixel));
    if (!mp->changes_map || !mp->vpt || !mp->hpt) {
        av_freep(&mp->changes_map);
        av_freep(&mp->vpt);
        av_freep(&mp->hpt);
        return AVERROR(ENOMEM);
    }
    avctx->pix_fmt = AV_PIX_FMT_RGB555;

    mp->frame = av_frame_alloc();
    if (!mp->frame) {
        mp_decode_end(avctx);
        return AVERROR(ENOMEM);
    }

    return 0;
}

static void mp_read_changes_map(MotionPixelsContext *mp, GetBitContext *gb, int count, int bits_len, int read_color)
{
    uint16_t *pixels;
    int offset, w, h, color = 0, x, y, i;

    while (count--) {
        offset = get_bits_long(gb, mp->offset_bits_len);
        w      = get_bits(gb, bits_len) + 1;
        h      = get_bits(gb, bits_len) + 1;
        if (read_color)
            color = get_bits(gb, 15);
        x = offset % mp->avctx->width;
        y = offset / mp->avctx->width;
        if (y >= mp->avctx->height)
            continue;
        w = FFMIN(w, mp->avctx->width  - x);
        h = FFMIN(h, mp->avctx->height - y);
        pixels = (uint16_t *)&mp->frame->data[0][y * mp->frame->linesize[0] + x * 2];
        while (h--) {
            mp->changes_map[offset] = w;
            if (read_color)
                for (i = 0; i < w; ++i)
                    pixels[i] = color;
            offset += mp->avctx->width;
            pixels += mp->frame->linesize[0] / 2;
        }
    }
}

static int mp_get_code(MotionPixelsContext *mp, GetBitContext *gb, int size, int code)
{
    while (get_bits1(gb)) {
        ++size;
        if (size > mp->max_codes_bits) {
            av_log(mp->avctx, AV_LOG_ERROR, "invalid code size %d/%d\n", size, mp->max_codes_bits);
            return AVERROR_INVALIDDATA;
        }
        code <<= 1;
        if (mp_get_code(mp, gb, size, code + 1) < 0)
            return AVERROR_INVALIDDATA;
    }
    if (mp->current_codes_count >= MAX_HUFF_CODES) {
        av_log(mp->avctx, AV_LOG_ERROR, "too many codes\n");
        return AVERROR_INVALIDDATA;
    }

    mp->codes[mp->current_codes_count  ].code = code;
    mp->codes[mp->current_codes_count++].size = size;
    return 0;
}

static int mp_read_codes_table(MotionPixelsContext *mp, GetBitContext *gb)
{
    if (mp->codes_count == 1) {
        mp->codes[0].delta = get_bits(gb, 4);
    } else {
        int i;
        int ret;

        mp->max_codes_bits = get_bits(gb, 4);
        for (i = 0; i < mp->codes_count; ++i)
            mp->codes[i].delta = get_bits(gb, 4);
        mp->current_codes_count = 0;
        if ((ret = mp_get_code(mp, gb, 0, 0)) < 0)
            return ret;
        if (mp->current_codes_count < mp->codes_count) {
            av_log(mp->avctx, AV_LOG_ERROR, "too few codes\n");
            return AVERROR_INVALIDDATA;
        }
   }
   return 0;
}

static int mp_gradient(MotionPixelsContext *mp, int component, int v)
{
    int delta;

    delta = (v - 7) * mp->gradient_scale[component];
    mp->gradient_scale[component] = (v == 0 || v == 14) ? 2 : 1;
    return delta;
}

static YuvPixel mp_get_yuv_from_rgb(MotionPixelsContext *mp, int x, int y)
{
    int color;

    color = *(uint16_t *)&mp->frame->data[0][y * mp->frame->linesize[0] + x * 2];
    return mp_rgb_yuv_table[color];
}

static void mp_set_rgb_from_yuv(MotionPixelsContext *mp, int x, int y, const YuvPixel *p)
{
    int color;

    color = mp_yuv_to_rgb(p->y, p->v, p->u, 1);
    *(uint16_t *)&mp->frame->data[0][y * mp->frame->linesize[0] + x * 2] = color;
}

static int mp_get_vlc(MotionPixelsContext *mp, GetBitContext *gb)
{
    int i;

    i = (mp->codes_count == 1) ? 0 : get_vlc2(gb, mp->vlc.table, mp->max_codes_bits, 1);
    return mp->codes[i].delta;
}

static void mp_decode_line(MotionPixelsContext *mp, GetBitContext *gb, int y)
{
    YuvPixel p;
    const int y0 = y * mp->avctx->width;
    int w, i, x = 0;

    p = mp->vpt[y];
    if (mp->changes_map[y0 + x] == 0) {
        memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale));
        ++x;
    }
    while (x < mp->avctx->width) {
        w = mp->changes_map[y0 + x];
        if (w != 0) {
            if ((y & 3) == 0) {
                if (mp->changes_map[y0 + x + mp->avctx->width] < w ||
                    mp->changes_map[y0 + x + mp->avctx->width * 2] < w ||
                    mp->changes_map[y0 + x + mp->avctx->width * 3] < w) {
                    for (i = (x + 3) & ~3; i < x + w; i += 4) {
                        mp->hpt[((y / 4) * mp->avctx->width + i) / 4] = mp_get_yuv_from_rgb(mp, i, y);
                    }
                }
            }
            x += w;
            memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale));
            p = mp_get_yuv_from_rgb(mp, x - 1, y);
        } else {
            p.y += mp_gradient(mp, 0, mp_get_vlc(mp, gb));
            p.y = av_clip(p.y, 0, 31);
            if ((x & 3) == 0) {
                if ((y & 3) == 0) {
                    p.v += mp_gradient(mp, 1, mp_get_vlc(mp, gb));
                    p.v = av_clip(p.v, -32, 31);
                    p.u += mp_gradient(mp, 2, mp_get_vlc(mp, gb));
                    p.u = av_clip(p.u, -32, 31);
                    mp->hpt[((y / 4) * mp->avctx->width + x) / 4] = p;
                } else {
                    p.v = mp->hpt[((y / 4) * mp->avctx->width + x) / 4].v;
                    p.u = mp->hpt[((y / 4) * mp->avctx->width + x) / 4].u;
                }
            }
            mp_set_rgb_from_yuv(mp, x, y, &p);
            ++x;
        }
    }
}

static void mp_decode_frame_helper(MotionPixelsContext *mp, GetBitContext *gb)
{
    YuvPixel p;
    int y, y0;

    av_assert1(mp->changes_map[0]);

    for (y = 0; y < mp->avctx->height; ++y) {
        if (mp->changes_map[y * mp->avctx->width] != 0) {
            memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale));
            p = mp_get_yuv_from_rgb(mp, 0, y);
        } else {
            p.y += mp_gradient(mp, 0, mp_get_vlc(mp, gb));
            p.y = av_clip(p.y, 0, 31);
            if ((y & 3) == 0) {
                p.v += mp_gradient(mp, 1, mp_get_vlc(mp, gb));
                p.v = av_clip(p.v, -32, 31);
                p.u += mp_gradient(mp, 2, mp_get_vlc(mp, gb));
                p.u = av_clip(p.u, -32, 31);
            }
            mp->vpt[y] = p;
            mp_set_rgb_from_yuv(mp, 0, y, &p);
        }
    }
    for (y0 = 0; y0 < 2; ++y0)
        for (y = y0; y < mp->avctx->height; y += 2)
            mp_decode_line(mp, gb, y);
}

static int mp_decode_frame(AVCodecContext *avctx,
                                 void *data, int *got_frame,
                                 AVPacket *avpkt)
{
    const uint8_t *buf = avpkt->data;
    int buf_size = avpkt->size;
    MotionPixelsContext *mp = avctx->priv_data;
    GetBitContext gb;
    int i, count1, count2, sz, ret;

    if ((ret = ff_reget_buffer(avctx, mp->frame)) < 0)
        return ret;

    /* le32 bitstream msb first */
    av_fast_padded_malloc(&mp->bswapbuf, &mp->bswapbuf_size, buf_size);
    if (!mp->bswapbuf)
        return AVERROR(ENOMEM);
    mp->bdsp.bswap_buf((uint32_t *) mp->bswapbuf, (const uint32_t *) buf,
                       buf_size / 4);
    if (buf_size & 3)
        memcpy(mp->bswapbuf + (buf_size & ~3), buf + (buf_size & ~3), buf_size & 3);
    init_get_bits(&gb, mp->bswapbuf, buf_size * 8);

    memset(mp->changes_map, 0, avctx->width * avctx->height);
    for (i = !(avctx->extradata[1] & 2); i < 2; ++i) {
        count1 = get_bits(&gb, 12);
        count2 = get_bits(&gb, 12);
        mp_read_changes_map(mp, &gb, count1, 8, i);
        mp_read_changes_map(mp, &gb, count2, 4, i);
    }

    mp->codes_count = get_bits(&gb, 4);
    if (mp->codes_count == 0)
        goto end;

    if (mp->changes_map[0] == 0) {
        *(uint16_t *)mp->frame->data[0] = get_bits(&gb, 15);
        mp->changes_map[0] = 1;
    }
    if (mp_read_codes_table(mp, &gb) < 0)
        goto end;

    sz = get_bits(&gb, 18);
    if (avctx->extradata[0] != 5)
        sz += get_bits(&gb, 18);
    if (sz == 0)
        goto end;

    if (mp->max_codes_bits <= 0)
        goto end;
    if (init_vlc(&mp->vlc, mp->max_codes_bits, mp->codes_count, &mp->codes[0].size, sizeof(HuffCode), 1, &mp->codes[0].code, sizeof(HuffCode), 4, 0))
        goto end;
    mp_decode_frame_helper(mp, &gb);
    ff_free_vlc(&mp->vlc);

end:
    if ((ret = av_frame_ref(data, mp->frame)) < 0)
        return ret;
    *got_frame       = 1;
    return buf_size;
}

AVCodec ff_motionpixels_decoder = {
    .name           = "motionpixels",
    .long_name      = NULL_IF_CONFIG_SMALL("Motion Pixels video"),
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = AV_CODEC_ID_MOTIONPIXELS,
    .priv_data_size = sizeof(MotionPixelsContext),
    .init           = mp_decode_init,
    .close          = mp_decode_end,
    .decode         = mp_decode_frame,
    .capabilities   = CODEC_CAP_DR1,
};
Commit	Line	Data
2ba45a60 DM	1	/*
	2	* Motion Pixels Video Decoder
	3	* Copyright (c) 2008 Gregory Montoir (cyx@users.sourceforge.net)
	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 "get_bits.h"
	24	#include "bswapdsp.h"
	25	#include "internal.h"
	26
	27	#define MAX_HUFF_CODES 16
	28
	29	#include "motionpixels_tablegen.h"
	30
	31	typedef struct HuffCode {
	32	int code;
	33	uint8_t size;
	34	uint8_t delta;
	35	} HuffCode;
	36
	37	typedef struct MotionPixelsContext {
	38	AVCodecContext *avctx;
	39	AVFrame *frame;
	40	BswapDSPContext bdsp;
	41	uint8_t *changes_map;
	42	int offset_bits_len;
	43	int codes_count, current_codes_count;
	44	int max_codes_bits;
	45	HuffCode codes[MAX_HUFF_CODES];
	46	VLC vlc;
	47	YuvPixel vpt, hpt;
	48	uint8_t gradient_scale[3];
	49	uint8_t *bswapbuf;
	50	int bswapbuf_size;
	51	} MotionPixelsContext;
	52
	53	static av_cold int mp_decode_end(AVCodecContext *avctx)
	54	{
	55	MotionPixelsContext *mp = avctx->priv_data;
	56
	57	av_freep(&mp->changes_map);
	58	av_freep(&mp->vpt);
	59	av_freep(&mp->hpt);
	60	av_freep(&mp->bswapbuf);
	61	av_frame_free(&mp->frame);
	62
	63	return 0;
	64	}
65
66	static av_cold int mp_decode_init(AVCodecContext *avctx)
67	{
68	MotionPixelsContext *mp = avctx->priv_data;
69	int w4 = (avctx->width + 3) & ~3;
70	int h4 = (avctx->height + 3) & ~3;
71
72	if(avctx->extradata_size < 2){
73	av_log(avctx, AV_LOG_ERROR, "extradata too small\n");
74	return AVERROR_INVALIDDATA;
75	}
76
77	motionpixels_tableinit();
78	mp->avctx = avctx;
79	ff_bswapdsp_init(&mp->bdsp);
80	mp->changes_map = av_mallocz_array(avctx->width, h4);
81	mp->offset_bits_len = av_log2(avctx->width * avctx->height) + 1;
82	mp->vpt = av_mallocz_array(avctx->height, sizeof(YuvPixel));
83	mp->hpt = av_mallocz_array(h4 / 4, w4 / 4 * sizeof(YuvPixel));
84	if (!mp->changes_map \|\| !mp->vpt \|\| !mp->hpt) {
85	av_freep(&mp->changes_map);
86	av_freep(&mp->vpt);
87	av_freep(&mp->hpt);
88	return AVERROR(ENOMEM);
89	}
90	avctx->pix_fmt = AV_PIX_FMT_RGB555;
91
92	mp->frame = av_frame_alloc();
93	if (!mp->frame) {
94	mp_decode_end(avctx);
95	return AVERROR(ENOMEM);
96	}
97
98	return 0;
99	}
100
101	static void mp_read_changes_map(MotionPixelsContext mp, GetBitContext gb, int count, int bits_len, int read_color)
102	{
103	uint16_t *pixels;
104	int offset, w, h, color = 0, x, y, i;
105
106	while (count--) {
107	offset = get_bits_long(gb, mp->offset_bits_len);
108	w = get_bits(gb, bits_len) + 1;
109	h = get_bits(gb, bits_len) + 1;
110	if (read_color)
111	color = get_bits(gb, 15);
112	x = offset % mp->avctx->width;
113	y = offset / mp->avctx->width;
114	if (y >= mp->avctx->height)
115	continue;
116	w = FFMIN(w, mp->avctx->width - x);
117	h = FFMIN(h, mp->avctx->height - y);
118	pixels = (uint16_t )&mp->frame->data[0][y mp->frame->linesize[0] + x * 2];
119	while (h--) {
120	mp->changes_map[offset] = w;
121	if (read_color)
122	for (i = 0; i < w; ++i)
123	pixels[i] = color;
124	offset += mp->avctx->width;
125	pixels += mp->frame->linesize[0] / 2;
126	}
127	}
128	}
129
130	static int mp_get_code(MotionPixelsContext mp, GetBitContext gb, int size, int code)
131	{
132	while (get_bits1(gb)) {
133	++size;
134	if (size > mp->max_codes_bits) {
135	av_log(mp->avctx, AV_LOG_ERROR, "invalid code size %d/%d\n", size, mp->max_codes_bits);
136	return AVERROR_INVALIDDATA;
137	}
138	code <<= 1;
139	if (mp_get_code(mp, gb, size, code + 1) < 0)
140	return AVERROR_INVALIDDATA;
141	}
142	if (mp->current_codes_count >= MAX_HUFF_CODES) {
143	av_log(mp->avctx, AV_LOG_ERROR, "too many codes\n");
144	return AVERROR_INVALIDDATA;
145	}
146
147	mp->codes[mp->current_codes_count ].code = code;
148	mp->codes[mp->current_codes_count++].size = size;
149	return 0;
150	}
151
152	static int mp_read_codes_table(MotionPixelsContext mp, GetBitContext gb)
153	{
154	if (mp->codes_count == 1) {
155	mp->codes[0].delta = get_bits(gb, 4);
156	} else {
157	int i;
158	int ret;
159
160	mp->max_codes_bits = get_bits(gb, 4);
161	for (i = 0; i < mp->codes_count; ++i)
162	mp->codes[i].delta = get_bits(gb, 4);
163	mp->current_codes_count = 0;
164	if ((ret = mp_get_code(mp, gb, 0, 0)) < 0)
165	return ret;
166	if (mp->current_codes_count < mp->codes_count) {
167	av_log(mp->avctx, AV_LOG_ERROR, "too few codes\n");
168	return AVERROR_INVALIDDATA;
169	}
170	}
171	return 0;
172	}
173
174	static int mp_gradient(MotionPixelsContext *mp, int component, int v)
175	{
176	int delta;
177
178	delta = (v - 7) * mp->gradient_scale[component];
179	mp->gradient_scale[component] = (v == 0 \|\| v == 14) ? 2 : 1;
180	return delta;
181	}
182
183	static YuvPixel mp_get_yuv_from_rgb(MotionPixelsContext *mp, int x, int y)
184	{
185	int color;
186
187	color = (uint16_t )&mp->frame->data[0][y * mp->frame->linesize[0] + x * 2];
188	return mp_rgb_yuv_table[color];
189	}
190
191	static void mp_set_rgb_from_yuv(MotionPixelsContext mp, int x, int y, const YuvPixel p)
192	{
193	int color;
194
195	color = mp_yuv_to_rgb(p->y, p->v, p->u, 1);
196	(uint16_t )&mp->frame->data[0][y * mp->frame->linesize[0] + x * 2] = color;
197	}
198
199	static int mp_get_vlc(MotionPixelsContext mp, GetBitContext gb)
200	{
201	int i;
202
203	i = (mp->codes_count == 1) ? 0 : get_vlc2(gb, mp->vlc.table, mp->max_codes_bits, 1);
204	return mp->codes[i].delta;
205	}
206
207	static void mp_decode_line(MotionPixelsContext mp, GetBitContext gb, int y)
208	{
209	YuvPixel p;
210	const int y0 = y * mp->avctx->width;
211	int w, i, x = 0;
212
213	p = mp->vpt[y];
214	if (mp->changes_map[y0 + x] == 0) {
215	memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale));
216	++x;
217	}
218	while (x < mp->avctx->width) {
219	w = mp->changes_map[y0 + x];
220	if (w != 0) {
221	if ((y & 3) == 0) {
222	if (mp->changes_map[y0 + x + mp->avctx->width] < w \|\|
223	mp->changes_map[y0 + x + mp->avctx->width * 2] < w \|\|
224	mp->changes_map[y0 + x + mp->avctx->width * 3] < w) {
225	for (i = (x + 3) & ~3; i < x + w; i += 4) {
226	mp->hpt[((y / 4) * mp->avctx->width + i) / 4] = mp_get_yuv_from_rgb(mp, i, y);
227	}
228	}
229	}
230	x += w;
231	memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale));
232	p = mp_get_yuv_from_rgb(mp, x - 1, y);
233	} else {
234	p.y += mp_gradient(mp, 0, mp_get_vlc(mp, gb));
235	p.y = av_clip(p.y, 0, 31);
236	if ((x & 3) == 0) {
237	if ((y & 3) == 0) {
238	p.v += mp_gradient(mp, 1, mp_get_vlc(mp, gb));
239	p.v = av_clip(p.v, -32, 31);
240	p.u += mp_gradient(mp, 2, mp_get_vlc(mp, gb));
241	p.u = av_clip(p.u, -32, 31);
242	mp->hpt[((y / 4) * mp->avctx->width + x) / 4] = p;
243	} else {
244	p.v = mp->hpt[((y / 4) * mp->avctx->width + x) / 4].v;
245	p.u = mp->hpt[((y / 4) * mp->avctx->width + x) / 4].u;
246	}
247	}
248	mp_set_rgb_from_yuv(mp, x, y, &p);
249	++x;
250	}
251	}
252	}
253
254	static void mp_decode_frame_helper(MotionPixelsContext mp, GetBitContext gb)
255	{
256	YuvPixel p;
257	int y, y0;
258
259	av_assert1(mp->changes_map[0]);
260
261	for (y = 0; y < mp->avctx->height; ++y) {
262	if (mp->changes_map[y * mp->avctx->width] != 0) {
263	memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale));
264	p = mp_get_yuv_from_rgb(mp, 0, y);
265	} else {
266	p.y += mp_gradient(mp, 0, mp_get_vlc(mp, gb));
267	p.y = av_clip(p.y, 0, 31);
268	if ((y & 3) == 0) {
269	p.v += mp_gradient(mp, 1, mp_get_vlc(mp, gb));
270	p.v = av_clip(p.v, -32, 31);
271	p.u += mp_gradient(mp, 2, mp_get_vlc(mp, gb));
272	p.u = av_clip(p.u, -32, 31);
273	}
274	mp->vpt[y] = p;
275	mp_set_rgb_from_yuv(mp, 0, y, &p);
276	}
277	}
278	for (y0 = 0; y0 < 2; ++y0)
279	for (y = y0; y < mp->avctx->height; y += 2)
280	mp_decode_line(mp, gb, y);
281	}
282
283	static int mp_decode_frame(AVCodecContext *avctx,
284	void data, int got_frame,
285	AVPacket *avpkt)
286	{
287	const uint8_t *buf = avpkt->data;
288	int buf_size = avpkt->size;
289	MotionPixelsContext *mp = avctx->priv_data;
290	GetBitContext gb;
291	int i, count1, count2, sz, ret;
292
293	if ((ret = ff_reget_buffer(avctx, mp->frame)) < 0)
294	return ret;
295
296	/* le32 bitstream msb first */
297	av_fast_padded_malloc(&mp->bswapbuf, &mp->bswapbuf_size, buf_size);
298	if (!mp->bswapbuf)
299	return AVERROR(ENOMEM);
300	mp->bdsp.bswap_buf((uint32_t ) mp->bswapbuf, (const uint32_t ) buf,
301	buf_size / 4);
302	if (buf_size & 3)
303	memcpy(mp->bswapbuf + (buf_size & ~3), buf + (buf_size & ~3), buf_size & 3);
304	init_get_bits(&gb, mp->bswapbuf, buf_size * 8);
305
306	memset(mp->changes_map, 0, avctx->width * avctx->height);
307	for (i = !(avctx->extradata[1] & 2); i < 2; ++i) {
308	count1 = get_bits(&gb, 12);
309	count2 = get_bits(&gb, 12);
310	mp_read_changes_map(mp, &gb, count1, 8, i);
311	mp_read_changes_map(mp, &gb, count2, 4, i);
312	}
313
314	mp->codes_count = get_bits(&gb, 4);
315	if (mp->codes_count == 0)
316	goto end;
317
318	if (mp->changes_map[0] == 0) {
319	(uint16_t )mp->frame->data[0] = get_bits(&gb, 15);
320	mp->changes_map[0] = 1;
321	}
322	if (mp_read_codes_table(mp, &gb) < 0)
323	goto end;
324
325	sz = get_bits(&gb, 18);
326	if (avctx->extradata[0] != 5)
327	sz += get_bits(&gb, 18);
328	if (sz == 0)
329	goto end;
330
331	if (mp->max_codes_bits <= 0)
332	goto end;
333	if (init_vlc(&mp->vlc, mp->max_codes_bits, mp->codes_count, &mp->codes[0].size, sizeof(HuffCode), 1, &mp->codes[0].code, sizeof(HuffCode), 4, 0))
334	goto end;
335	mp_decode_frame_helper(mp, &gb);
336	ff_free_vlc(&mp->vlc);
337
338	end:
339	if ((ret = av_frame_ref(data, mp->frame)) < 0)
340	return ret;
341	*got_frame = 1;
342	return buf_size;
343	}
344
345	AVCodec ff_motionpixels_decoder = {
346	.name = "motionpixels",
347	.long_name = NULL_IF_CONFIG_SMALL("Motion Pixels video"),
348	.type = AVMEDIA_TYPE_VIDEO,
349	.id = AV_CODEC_ID_MOTIONPIXELS,
350	.priv_data_size = sizeof(MotionPixelsContext),
351	.init = mp_decode_init,
352	.close = mp_decode_end,
353	.decode = mp_decode_frame,
354	.capabilities = CODEC_CAP_DR1,
355	};