2 * Motion Pixels Video Decoder
3 * Copyright (c) 2008 Gregory Montoir (cyx@users.sourceforge.net)
5 * This file is part of FFmpeg.
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.
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.
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
27 #define MAX_HUFF_CODES 16
29 #include "motionpixels_tablegen.h"
31 typedef struct HuffCode {
37 typedef struct MotionPixelsContext {
38 AVCodecContext *avctx;
43 int codes_count, current_codes_count;
45 HuffCode codes[MAX_HUFF_CODES];
48 uint8_t gradient_scale[3];
51 } MotionPixelsContext;
53 static av_cold int mp_decode_end(AVCodecContext *avctx)
55 MotionPixelsContext *mp = avctx->priv_data;
57 av_freep(&mp->changes_map);
60 av_freep(&mp->bswapbuf);
61 av_frame_free(&mp->frame);
66 static av_cold int mp_decode_init(AVCodecContext *avctx)
68 MotionPixelsContext *mp = avctx->priv_data;
69 int w4 = (avctx->width + 3) & ~3;
70 int h4 = (avctx->height + 3) & ~3;
72 if(avctx->extradata_size < 2){
73 av_log(avctx, AV_LOG_ERROR, "extradata too small\n");
74 return AVERROR_INVALIDDATA;
77 motionpixels_tableinit();
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 return AVERROR(ENOMEM);
86 avctx->pix_fmt = AV_PIX_FMT_RGB555;
88 mp->frame = av_frame_alloc();
90 return AVERROR(ENOMEM);
95 static void mp_read_changes_map(MotionPixelsContext *mp, GetBitContext *gb, int count, int bits_len, int read_color)
98 int offset, w, h, color = 0, x, y, i;
101 offset = get_bits_long(gb, mp->offset_bits_len);
102 w = get_bits(gb, bits_len) + 1;
103 h = get_bits(gb, bits_len) + 1;
105 color = get_bits(gb, 15);
106 x = offset % mp->avctx->width;
107 y = offset / mp->avctx->width;
108 if (y >= mp->avctx->height)
110 w = FFMIN(w, mp->avctx->width - x);
111 h = FFMIN(h, mp->avctx->height - y);
112 pixels = (uint16_t *)&mp->frame->data[0][y * mp->frame->linesize[0] + x * 2];
114 mp->changes_map[offset] = w;
116 for (i = 0; i < w; ++i)
118 offset += mp->avctx->width;
119 pixels += mp->frame->linesize[0] / 2;
124 static int mp_get_code(MotionPixelsContext *mp, GetBitContext *gb, int size, int code)
126 while (get_bits1(gb)) {
128 if (size > mp->max_codes_bits) {
129 av_log(mp->avctx, AV_LOG_ERROR, "invalid code size %d/%d\n", size, mp->max_codes_bits);
130 return AVERROR_INVALIDDATA;
133 if (mp_get_code(mp, gb, size, code + 1) < 0)
134 return AVERROR_INVALIDDATA;
136 if (mp->current_codes_count >= mp->codes_count) {
137 av_log(mp->avctx, AV_LOG_ERROR, "too many codes\n");
138 return AVERROR_INVALIDDATA;
141 mp->codes[mp->current_codes_count ].code = code;
142 mp->codes[mp->current_codes_count++].size = size;
146 static int mp_read_codes_table(MotionPixelsContext *mp, GetBitContext *gb)
148 if (mp->codes_count == 1) {
149 mp->codes[0].delta = get_bits(gb, 4);
154 mp->max_codes_bits = get_bits(gb, 4);
155 for (i = 0; i < mp->codes_count; ++i)
156 mp->codes[i].delta = get_bits(gb, 4);
157 mp->current_codes_count = 0;
158 if ((ret = mp_get_code(mp, gb, 0, 0)) < 0)
160 if (mp->current_codes_count < mp->codes_count) {
161 av_log(mp->avctx, AV_LOG_ERROR, "too few codes\n");
162 return AVERROR_INVALIDDATA;
168 static av_always_inline int mp_gradient(MotionPixelsContext *mp, int component, int v)
172 delta = (v - 7) * mp->gradient_scale[component];
173 mp->gradient_scale[component] = (v == 0 || v == 14) ? 2 : 1;
177 static YuvPixel mp_get_yuv_from_rgb(MotionPixelsContext *mp, int x, int y)
181 color = *(uint16_t *)&mp->frame->data[0][y * mp->frame->linesize[0] + x * 2];
182 return mp_rgb_yuv_table[color];
185 static void mp_set_rgb_from_yuv(MotionPixelsContext *mp, int x, int y, const YuvPixel *p)
189 color = mp_yuv_to_rgb(p->y, p->v, p->u, 1);
190 *(uint16_t *)&mp->frame->data[0][y * mp->frame->linesize[0] + x * 2] = color;
193 static av_always_inline int mp_get_vlc(MotionPixelsContext *mp, GetBitContext *gb)
197 i = (mp->codes_count == 1) ? 0 : get_vlc2(gb, mp->vlc.table, mp->max_codes_bits, 1);
200 return mp->codes[i].delta;
203 static void mp_decode_line(MotionPixelsContext *mp, GetBitContext *gb, int y)
206 const int y0 = y * mp->avctx->width;
210 if (mp->changes_map[y0 + x] == 0) {
211 memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale));
214 while (x < mp->avctx->width) {
215 w = mp->changes_map[y0 + x];
218 if (mp->changes_map[y0 + x + mp->avctx->width] < w ||
219 mp->changes_map[y0 + x + mp->avctx->width * 2] < w ||
220 mp->changes_map[y0 + x + mp->avctx->width * 3] < w) {
221 for (i = (x + 3) & ~3; i < x + w; i += 4) {
222 mp->hpt[((y / 4) * mp->avctx->width + i) / 4] = mp_get_yuv_from_rgb(mp, i, y);
227 memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale));
228 p = mp_get_yuv_from_rgb(mp, x - 1, y);
230 p.y += mp_gradient(mp, 0, mp_get_vlc(mp, gb));
231 p.y = av_clip_uintp2(p.y, 5);
234 p.v += mp_gradient(mp, 1, mp_get_vlc(mp, gb));
235 p.v = av_clip_intp2(p.v, 5);
236 p.u += mp_gradient(mp, 2, mp_get_vlc(mp, gb));
237 p.u = av_clip_intp2(p.u, 5);
238 mp->hpt[((y / 4) * mp->avctx->width + x) / 4] = p;
240 p.v = mp->hpt[((y / 4) * mp->avctx->width + x) / 4].v;
241 p.u = mp->hpt[((y / 4) * mp->avctx->width + x) / 4].u;
244 mp_set_rgb_from_yuv(mp, x, y, &p);
250 static void mp_decode_frame_helper(MotionPixelsContext *mp, GetBitContext *gb)
255 av_assert1(mp->changes_map[0]);
257 for (y = 0; y < mp->avctx->height; ++y) {
258 if (mp->changes_map[y * mp->avctx->width] != 0) {
259 memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale));
260 p = mp_get_yuv_from_rgb(mp, 0, y);
262 p.y += mp_gradient(mp, 0, mp_get_vlc(mp, gb));
263 p.y = av_clip_uintp2(p.y, 5);
265 p.v += mp_gradient(mp, 1, mp_get_vlc(mp, gb));
266 p.v = av_clip_intp2(p.v, 5);
267 p.u += mp_gradient(mp, 2, mp_get_vlc(mp, gb));
268 p.u = av_clip_intp2(p.u, 5);
271 mp_set_rgb_from_yuv(mp, 0, y, &p);
274 for (y0 = 0; y0 < 2; ++y0)
275 for (y = y0; y < mp->avctx->height; y += 2)
276 mp_decode_line(mp, gb, y);
279 static int mp_decode_frame(AVCodecContext *avctx,
280 void *data, int *got_frame,
283 const uint8_t *buf = avpkt->data;
284 int buf_size = avpkt->size;
285 MotionPixelsContext *mp = avctx->priv_data;
287 int i, count1, count2, sz, ret;
289 if ((ret = ff_reget_buffer(avctx, mp->frame, 0)) < 0)
292 /* le32 bitstream msb first */
293 av_fast_padded_malloc(&mp->bswapbuf, &mp->bswapbuf_size, buf_size);
295 return AVERROR(ENOMEM);
296 mp->bdsp.bswap_buf((uint32_t *) mp->bswapbuf, (const uint32_t *) buf,
299 memcpy(mp->bswapbuf + (buf_size & ~3), buf + (buf_size & ~3), buf_size & 3);
300 init_get_bits(&gb, mp->bswapbuf, buf_size * 8);
302 memset(mp->changes_map, 0, avctx->width * avctx->height);
303 for (i = !(avctx->extradata[1] & 2); i < 2; ++i) {
304 count1 = get_bits(&gb, 12);
305 count2 = get_bits(&gb, 12);
306 mp_read_changes_map(mp, &gb, count1, 8, i);
307 mp_read_changes_map(mp, &gb, count2, 4, i);
310 mp->codes_count = get_bits(&gb, 4);
311 if (mp->codes_count == 0)
314 if (mp->changes_map[0] == 0) {
315 *(uint16_t *)mp->frame->data[0] = get_bits(&gb, 15);
316 mp->changes_map[0] = 1;
318 if (mp_read_codes_table(mp, &gb) < 0)
321 sz = get_bits(&gb, 18);
322 if (avctx->extradata[0] != 5)
323 sz += get_bits(&gb, 18);
327 if (mp->codes_count > 1)
328 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))
330 mp_decode_frame_helper(mp, &gb);
331 ff_free_vlc(&mp->vlc);
334 if ((ret = av_frame_ref(data, mp->frame)) < 0)
340 AVCodec ff_motionpixels_decoder = {
341 .name = "motionpixels",
342 .long_name = NULL_IF_CONFIG_SMALL("Motion Pixels video"),
343 .type = AVMEDIA_TYPE_VIDEO,
344 .id = AV_CODEC_ID_MOTIONPIXELS,
345 .priv_data_size = sizeof(MotionPixelsContext),
346 .init = mp_decode_init,
347 .close = mp_decode_end,
348 .decode = mp_decode_frame,
349 .capabilities = AV_CODEC_CAP_DR1,
350 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,