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00022 #include "avcodec.h"
00023 #include "get_bits.h"
00024 #include "dsputil.h"
00025
00026 #define MAX_HUFF_CODES 16
00027
00028 #include "motionpixels_tablegen.h"
00029
00030 typedef struct HuffCode {
00031 int code;
00032 uint8_t size;
00033 uint8_t delta;
00034 } HuffCode;
00035
00036 typedef struct MotionPixelsContext {
00037 AVCodecContext *avctx;
00038 AVFrame frame;
00039 DSPContext dsp;
00040 uint8_t *changes_map;
00041 int offset_bits_len;
00042 int codes_count, current_codes_count;
00043 int max_codes_bits;
00044 HuffCode codes[MAX_HUFF_CODES];
00045 VLC vlc;
00046 YuvPixel *vpt, *hpt;
00047 uint8_t gradient_scale[3];
00048 uint8_t *bswapbuf;
00049 int bswapbuf_size;
00050 } MotionPixelsContext;
00051
00052 static av_cold int mp_decode_init(AVCodecContext *avctx)
00053 {
00054 MotionPixelsContext *mp = avctx->priv_data;
00055
00056 motionpixels_tableinit();
00057 mp->avctx = avctx;
00058 dsputil_init(&mp->dsp, avctx);
00059 mp->changes_map = av_mallocz(avctx->width * avctx->height);
00060 mp->offset_bits_len = av_log2(avctx->width * avctx->height) + 1;
00061 mp->vpt = av_mallocz(avctx->height * sizeof(YuvPixel));
00062 mp->hpt = av_mallocz(avctx->height * avctx->width / 16 * sizeof(YuvPixel));
00063 avctx->pix_fmt = PIX_FMT_RGB555;
00064 return 0;
00065 }
00066
00067 static void mp_read_changes_map(MotionPixelsContext *mp, GetBitContext *gb, int count, int bits_len, int read_color)
00068 {
00069 uint16_t *pixels;
00070 int offset, w, h, color = 0, x, y, i;
00071
00072 while (count--) {
00073 offset = get_bits_long(gb, mp->offset_bits_len);
00074 w = get_bits(gb, bits_len) + 1;
00075 h = get_bits(gb, bits_len) + 1;
00076 if (read_color)
00077 color = get_bits(gb, 15);
00078 x = offset % mp->avctx->width;
00079 y = offset / mp->avctx->width;
00080 if (y >= mp->avctx->height)
00081 continue;
00082 w = FFMIN(w, mp->avctx->width - x);
00083 h = FFMIN(h, mp->avctx->height - y);
00084 pixels = (uint16_t *)&mp->frame.data[0][y * mp->frame.linesize[0] + x * 2];
00085 while (h--) {
00086 mp->changes_map[offset] = w;
00087 if (read_color)
00088 for (i = 0; i < w; ++i)
00089 pixels[i] = color;
00090 offset += mp->avctx->width;
00091 pixels += mp->frame.linesize[0] / 2;
00092 }
00093 }
00094 }
00095
00096 static void mp_get_code(MotionPixelsContext *mp, GetBitContext *gb, int size, int code)
00097 {
00098 while (get_bits1(gb)) {
00099 ++size;
00100 if (size > mp->max_codes_bits) {
00101 av_log(mp->avctx, AV_LOG_ERROR, "invalid code size %d/%d\n", size, mp->max_codes_bits);
00102 return;
00103 }
00104 code <<= 1;
00105 mp_get_code(mp, gb, size, code + 1);
00106 }
00107 if (mp->current_codes_count >= MAX_HUFF_CODES) {
00108 av_log(mp->avctx, AV_LOG_ERROR, "too many codes\n");
00109 return;
00110 }
00111 mp->codes[mp->current_codes_count ].code = code;
00112 mp->codes[mp->current_codes_count++].size = size;
00113 }
00114
00115 static void mp_read_codes_table(MotionPixelsContext *mp, GetBitContext *gb)
00116 {
00117 if (mp->codes_count == 1) {
00118 mp->codes[0].delta = get_bits(gb, 4);
00119 } else {
00120 int i;
00121
00122 mp->max_codes_bits = get_bits(gb, 4);
00123 for (i = 0; i < mp->codes_count; ++i)
00124 mp->codes[i].delta = get_bits(gb, 4);
00125 mp->current_codes_count = 0;
00126 mp_get_code(mp, gb, 0, 0);
00127 }
00128 }
00129
00130 static int mp_gradient(MotionPixelsContext *mp, int component, int v)
00131 {
00132 int delta;
00133
00134 delta = (v - 7) * mp->gradient_scale[component];
00135 mp->gradient_scale[component] = (v == 0 || v == 14) ? 2 : 1;
00136 return delta;
00137 }
00138
00139 static YuvPixel mp_get_yuv_from_rgb(MotionPixelsContext *mp, int x, int y)
00140 {
00141 int color;
00142
00143 color = *(uint16_t *)&mp->frame.data[0][y * mp->frame.linesize[0] + x * 2];
00144 return mp_rgb_yuv_table[color];
00145 }
00146
00147 static void mp_set_rgb_from_yuv(MotionPixelsContext *mp, int x, int y, const YuvPixel *p)
00148 {
00149 int color;
00150
00151 color = mp_yuv_to_rgb(p->y, p->v, p->u, 1);
00152 *(uint16_t *)&mp->frame.data[0][y * mp->frame.linesize[0] + x * 2] = color;
00153 }
00154
00155 static int mp_get_vlc(MotionPixelsContext *mp, GetBitContext *gb)
00156 {
00157 int i;
00158
00159 i = (mp->codes_count == 1) ? 0 : get_vlc2(gb, mp->vlc.table, mp->max_codes_bits, 1);
00160 return mp->codes[i].delta;
00161 }
00162
00163 static void mp_decode_line(MotionPixelsContext *mp, GetBitContext *gb, int y)
00164 {
00165 YuvPixel p;
00166 const int y0 = y * mp->avctx->width;
00167 int w, i, x = 0;
00168
00169 p = mp->vpt[y];
00170 if (mp->changes_map[y0 + x] == 0) {
00171 memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale));
00172 ++x;
00173 }
00174 while (x < mp->avctx->width) {
00175 w = mp->changes_map[y0 + x];
00176 if (w != 0) {
00177 if ((y & 3) == 0) {
00178 if (mp->changes_map[y0 + x + mp->avctx->width] < w ||
00179 mp->changes_map[y0 + x + mp->avctx->width * 2] < w ||
00180 mp->changes_map[y0 + x + mp->avctx->width * 3] < w) {
00181 for (i = (x + 3) & ~3; i < x + w; i += 4) {
00182 mp->hpt[((y / 4) * mp->avctx->width + i) / 4] = mp_get_yuv_from_rgb(mp, i, y);
00183 }
00184 }
00185 }
00186 x += w;
00187 memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale));
00188 p = mp_get_yuv_from_rgb(mp, x - 1, y);
00189 } else {
00190 p.y += mp_gradient(mp, 0, mp_get_vlc(mp, gb));
00191 if ((x & 3) == 0) {
00192 if ((y & 3) == 0) {
00193 p.v += mp_gradient(mp, 1, mp_get_vlc(mp, gb));
00194 p.u += mp_gradient(mp, 2, mp_get_vlc(mp, gb));
00195 mp->hpt[((y / 4) * mp->avctx->width + x) / 4] = p;
00196 } else {
00197 p.v = mp->hpt[((y / 4) * mp->avctx->width + x) / 4].v;
00198 p.u = mp->hpt[((y / 4) * mp->avctx->width + x) / 4].u;
00199 }
00200 }
00201 mp_set_rgb_from_yuv(mp, x, y, &p);
00202 ++x;
00203 }
00204 }
00205 }
00206
00207 static void mp_decode_frame_helper(MotionPixelsContext *mp, GetBitContext *gb)
00208 {
00209 YuvPixel p;
00210 int y, y0;
00211
00212 for (y = 0; y < mp->avctx->height; ++y) {
00213 if (mp->changes_map[y * mp->avctx->width] != 0) {
00214 memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale));
00215 p = mp_get_yuv_from_rgb(mp, 0, y);
00216 } else {
00217 p.y += mp_gradient(mp, 0, mp_get_vlc(mp, gb));
00218 if ((y & 3) == 0) {
00219 p.v += mp_gradient(mp, 1, mp_get_vlc(mp, gb));
00220 p.u += mp_gradient(mp, 2, mp_get_vlc(mp, gb));
00221 }
00222 mp->vpt[y] = p;
00223 mp_set_rgb_from_yuv(mp, 0, y, &p);
00224 }
00225 }
00226 for (y0 = 0; y0 < 2; ++y0)
00227 for (y = y0; y < mp->avctx->height; y += 2)
00228 mp_decode_line(mp, gb, y);
00229 }
00230
00231 static int mp_decode_frame(AVCodecContext *avctx,
00232 void *data, int *data_size,
00233 AVPacket *avpkt)
00234 {
00235 const uint8_t *buf = avpkt->data;
00236 int buf_size = avpkt->size;
00237 MotionPixelsContext *mp = avctx->priv_data;
00238 GetBitContext gb;
00239 int i, count1, count2, sz;
00240
00241 mp->frame.reference = 1;
00242 mp->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
00243 if (avctx->reget_buffer(avctx, &mp->frame)) {
00244 av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
00245 return -1;
00246 }
00247
00248
00249 av_fast_malloc(&mp->bswapbuf, &mp->bswapbuf_size, buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
00250 if (!mp->bswapbuf)
00251 return AVERROR(ENOMEM);
00252 mp->dsp.bswap_buf((uint32_t *)mp->bswapbuf, (const uint32_t *)buf, buf_size / 4);
00253 if (buf_size & 3)
00254 memcpy(mp->bswapbuf + (buf_size & ~3), buf + (buf_size & ~3), buf_size & 3);
00255 init_get_bits(&gb, mp->bswapbuf, buf_size * 8);
00256
00257 memset(mp->changes_map, 0, avctx->width * avctx->height);
00258 for (i = !(avctx->extradata[1] & 2); i < 2; ++i) {
00259 count1 = get_bits(&gb, 12);
00260 count2 = get_bits(&gb, 12);
00261 mp_read_changes_map(mp, &gb, count1, 8, i);
00262 mp_read_changes_map(mp, &gb, count2, 4, i);
00263 }
00264
00265 mp->codes_count = get_bits(&gb, 4);
00266 if (mp->codes_count == 0)
00267 goto end;
00268
00269 if (mp->changes_map[0] == 0) {
00270 *(uint16_t *)mp->frame.data[0] = get_bits(&gb, 15);
00271 mp->changes_map[0] = 1;
00272 }
00273 mp_read_codes_table(mp, &gb);
00274
00275 sz = get_bits(&gb, 18);
00276 if (avctx->extradata[0] != 5)
00277 sz += get_bits(&gb, 18);
00278 if (sz == 0)
00279 goto end;
00280
00281 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);
00282 mp_decode_frame_helper(mp, &gb);
00283 free_vlc(&mp->vlc);
00284
00285 end:
00286 *data_size = sizeof(AVFrame);
00287 *(AVFrame *)data = mp->frame;
00288 return buf_size;
00289 }
00290
00291 static av_cold int mp_decode_end(AVCodecContext *avctx)
00292 {
00293 MotionPixelsContext *mp = avctx->priv_data;
00294
00295 av_freep(&mp->changes_map);
00296 av_freep(&mp->vpt);
00297 av_freep(&mp->hpt);
00298 av_freep(&mp->bswapbuf);
00299 if (mp->frame.data[0])
00300 avctx->release_buffer(avctx, &mp->frame);
00301
00302 return 0;
00303 }
00304
00305 AVCodec motionpixels_decoder = {
00306 "motionpixels",
00307 AVMEDIA_TYPE_VIDEO,
00308 CODEC_ID_MOTIONPIXELS,
00309 sizeof(MotionPixelsContext),
00310 mp_decode_init,
00311 NULL,
00312 mp_decode_end,
00313 mp_decode_frame,
00314 CODEC_CAP_DR1,
00315 .long_name = NULL_IF_CONFIG_SMALL("Motion Pixels video"),
00316 };