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
26 #define MAX_HUFF_CODES 16
28 #include "motionpixels_tablegen.h"
30 typedef struct HuffCode {
36 typedef struct MotionPixelsContext {
37 AVCodecContext *avctx;
42 int codes_count, current_codes_count;
44 HuffCode codes[MAX_HUFF_CODES];
47 uint8_t gradient_scale[3];
50 } MotionPixelsContext;
52 static av_cold int mp_decode_init(AVCodecContext *avctx)
54 MotionPixelsContext *mp = avctx->priv_data;
55 int w4 = (avctx->width + 3) & ~3;
56 int h4 = (avctx->height + 3) & ~3;
58 if(avctx->extradata_size < 2){
59 av_log(avctx, AV_LOG_ERROR, "extradata too small\n");
60 return AVERROR_INVALIDDATA;
63 motionpixels_tableinit();
65 ff_dsputil_init(&mp->dsp, avctx);
66 mp->changes_map = av_mallocz(avctx->width * h4);
67 mp->offset_bits_len = av_log2(avctx->width * avctx->height) + 1;
68 mp->vpt = av_mallocz(avctx->height * sizeof(YuvPixel));
69 mp->hpt = av_mallocz(h4 * w4 / 16 * sizeof(YuvPixel));
70 avctx->pix_fmt = PIX_FMT_RGB555;
71 avcodec_get_frame_defaults(&mp->frame);
75 static void mp_read_changes_map(MotionPixelsContext *mp, GetBitContext *gb, int count, int bits_len, int read_color)
78 int offset, w, h, color = 0, x, y, i;
81 offset = get_bits_long(gb, mp->offset_bits_len);
82 w = get_bits(gb, bits_len) + 1;
83 h = get_bits(gb, bits_len) + 1;
85 color = get_bits(gb, 15);
86 x = offset % mp->avctx->width;
87 y = offset / mp->avctx->width;
88 if (y >= mp->avctx->height)
90 w = FFMIN(w, mp->avctx->width - x);
91 h = FFMIN(h, mp->avctx->height - y);
92 pixels = (uint16_t *)&mp->frame.data[0][y * mp->frame.linesize[0] + x * 2];
94 mp->changes_map[offset] = w;
96 for (i = 0; i < w; ++i)
98 offset += mp->avctx->width;
99 pixels += mp->frame.linesize[0] / 2;
104 static void mp_get_code(MotionPixelsContext *mp, GetBitContext *gb, int size, int code)
106 while (get_bits1(gb)) {
108 if (size > mp->max_codes_bits) {
109 av_log(mp->avctx, AV_LOG_ERROR, "invalid code size %d/%d\n", size, mp->max_codes_bits);
113 mp_get_code(mp, gb, size, code + 1);
115 if (mp->current_codes_count >= MAX_HUFF_CODES) {
116 av_log(mp->avctx, AV_LOG_ERROR, "too many codes\n");
119 mp->codes[mp->current_codes_count ].code = code;
120 mp->codes[mp->current_codes_count++].size = size;
123 static void mp_read_codes_table(MotionPixelsContext *mp, GetBitContext *gb)
125 if (mp->codes_count == 1) {
126 mp->codes[0].delta = get_bits(gb, 4);
130 mp->max_codes_bits = get_bits(gb, 4);
131 for (i = 0; i < mp->codes_count; ++i)
132 mp->codes[i].delta = get_bits(gb, 4);
133 mp->current_codes_count = 0;
134 mp_get_code(mp, gb, 0, 0);
138 static int mp_gradient(MotionPixelsContext *mp, int component, int v)
142 delta = (v - 7) * mp->gradient_scale[component];
143 mp->gradient_scale[component] = (v == 0 || v == 14) ? 2 : 1;
147 static YuvPixel mp_get_yuv_from_rgb(MotionPixelsContext *mp, int x, int y)
151 color = *(uint16_t *)&mp->frame.data[0][y * mp->frame.linesize[0] + x * 2];
152 return mp_rgb_yuv_table[color];
155 static void mp_set_rgb_from_yuv(MotionPixelsContext *mp, int x, int y, const YuvPixel *p)
159 color = mp_yuv_to_rgb(p->y, p->v, p->u, 1);
160 *(uint16_t *)&mp->frame.data[0][y * mp->frame.linesize[0] + x * 2] = color;
163 static int mp_get_vlc(MotionPixelsContext *mp, GetBitContext *gb)
167 i = (mp->codes_count == 1) ? 0 : get_vlc2(gb, mp->vlc.table, mp->max_codes_bits, 1);
168 return mp->codes[i].delta;
171 static void mp_decode_line(MotionPixelsContext *mp, GetBitContext *gb, int y)
174 const int y0 = y * mp->avctx->width;
178 if (mp->changes_map[y0 + x] == 0) {
179 memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale));
182 while (x < mp->avctx->width) {
183 w = mp->changes_map[y0 + x];
186 if (mp->changes_map[y0 + x + mp->avctx->width] < w ||
187 mp->changes_map[y0 + x + mp->avctx->width * 2] < w ||
188 mp->changes_map[y0 + x + mp->avctx->width * 3] < w) {
189 for (i = (x + 3) & ~3; i < x + w; i += 4) {
190 mp->hpt[((y / 4) * mp->avctx->width + i) / 4] = mp_get_yuv_from_rgb(mp, i, y);
195 memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale));
196 p = mp_get_yuv_from_rgb(mp, x - 1, y);
198 p.y += mp_gradient(mp, 0, mp_get_vlc(mp, gb));
199 p.y = av_clip(p.y, 0, 31);
202 p.v += mp_gradient(mp, 1, mp_get_vlc(mp, gb));
203 p.v = av_clip(p.v, -32, 31);
204 p.u += mp_gradient(mp, 2, mp_get_vlc(mp, gb));
205 p.u = av_clip(p.u, -32, 31);
206 mp->hpt[((y / 4) * mp->avctx->width + x) / 4] = p;
208 p.v = mp->hpt[((y / 4) * mp->avctx->width + x) / 4].v;
209 p.u = mp->hpt[((y / 4) * mp->avctx->width + x) / 4].u;
212 mp_set_rgb_from_yuv(mp, x, y, &p);
218 static void mp_decode_frame_helper(MotionPixelsContext *mp, GetBitContext *gb)
223 for (y = 0; y < mp->avctx->height; ++y) {
224 if (mp->changes_map[y * mp->avctx->width] != 0) {
225 memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale));
226 p = mp_get_yuv_from_rgb(mp, 0, y);
228 p.y += mp_gradient(mp, 0, mp_get_vlc(mp, gb));
229 p.y = av_clip(p.y, 0, 31);
231 p.v += mp_gradient(mp, 1, mp_get_vlc(mp, gb));
232 p.v = av_clip(p.v, -32, 31);
233 p.u += mp_gradient(mp, 2, mp_get_vlc(mp, gb));
234 p.u = av_clip(p.u, -32, 31);
237 mp_set_rgb_from_yuv(mp, 0, y, &p);
240 for (y0 = 0; y0 < 2; ++y0)
241 for (y = y0; y < mp->avctx->height; y += 2)
242 mp_decode_line(mp, gb, y);
245 static int mp_decode_frame(AVCodecContext *avctx,
246 void *data, int *data_size,
249 const uint8_t *buf = avpkt->data;
250 int buf_size = avpkt->size;
251 MotionPixelsContext *mp = avctx->priv_data;
253 int i, count1, count2, sz;
255 mp->frame.reference = 3;
256 mp->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
257 if (avctx->reget_buffer(avctx, &mp->frame)) {
258 av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
262 /* le32 bitstream msb first */
263 av_fast_malloc(&mp->bswapbuf, &mp->bswapbuf_size, buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
265 return AVERROR(ENOMEM);
266 mp->dsp.bswap_buf((uint32_t *)mp->bswapbuf, (const uint32_t *)buf, buf_size / 4);
268 memcpy(mp->bswapbuf + (buf_size & ~3), buf + (buf_size & ~3), buf_size & 3);
269 memset(mp->bswapbuf + buf_size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
270 init_get_bits(&gb, mp->bswapbuf, buf_size * 8);
272 memset(mp->changes_map, 0, avctx->width * avctx->height);
273 for (i = !(avctx->extradata[1] & 2); i < 2; ++i) {
274 count1 = get_bits(&gb, 12);
275 count2 = get_bits(&gb, 12);
276 mp_read_changes_map(mp, &gb, count1, 8, i);
277 mp_read_changes_map(mp, &gb, count2, 4, i);
280 mp->codes_count = get_bits(&gb, 4);
281 if (mp->codes_count == 0)
284 if (mp->changes_map[0] == 0) {
285 *(uint16_t *)mp->frame.data[0] = get_bits(&gb, 15);
286 mp->changes_map[0] = 1;
288 mp_read_codes_table(mp, &gb);
290 sz = get_bits(&gb, 18);
291 if (avctx->extradata[0] != 5)
292 sz += get_bits(&gb, 18);
296 if (mp->max_codes_bits <= 0)
298 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))
300 mp_decode_frame_helper(mp, &gb);
301 ff_free_vlc(&mp->vlc);
304 *data_size = sizeof(AVFrame);
305 *(AVFrame *)data = mp->frame;
309 static av_cold int mp_decode_end(AVCodecContext *avctx)
311 MotionPixelsContext *mp = avctx->priv_data;
313 av_freep(&mp->changes_map);
316 av_freep(&mp->bswapbuf);
317 if (mp->frame.data[0])
318 avctx->release_buffer(avctx, &mp->frame);
323 AVCodec ff_motionpixels_decoder = {
324 .name = "motionpixels",
325 .type = AVMEDIA_TYPE_VIDEO,
326 .id = CODEC_ID_MOTIONPIXELS,
327 .priv_data_size = sizeof(MotionPixelsContext),
328 .init = mp_decode_init,
329 .close = mp_decode_end,
330 .decode = mp_decode_frame,
331 .capabilities = CODEC_CAP_DR1,
332 .long_name = NULL_IF_CONFIG_SMALL("Motion Pixels video"),