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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 int w4 = (avctx->width + 3) & ~3;
00056 int h4 = (avctx->height + 3) & ~3;
00057
00058 motionpixels_tableinit();
00059 mp->avctx = avctx;
00060 dsputil_init(&mp->dsp, avctx);
00061 mp->changes_map = av_mallocz(avctx->width * h4);
00062 mp->offset_bits_len = av_log2(avctx->width * avctx->height) + 1;
00063 mp->vpt = av_mallocz(avctx->height * sizeof(YuvPixel));
00064 mp->hpt = av_mallocz(h4 * w4 / 16 * sizeof(YuvPixel));
00065 avctx->pix_fmt = PIX_FMT_RGB555;
00066 avcodec_get_frame_defaults(&mp->frame);
00067 return 0;
00068 }
00069
00070 static void mp_read_changes_map(MotionPixelsContext *mp, GetBitContext *gb, int count, int bits_len, int read_color)
00071 {
00072 uint16_t *pixels;
00073 int offset, w, h, color = 0, x, y, i;
00074
00075 while (count--) {
00076 offset = get_bits_long(gb, mp->offset_bits_len);
00077 w = get_bits(gb, bits_len) + 1;
00078 h = get_bits(gb, bits_len) + 1;
00079 if (read_color)
00080 color = get_bits(gb, 15);
00081 x = offset % mp->avctx->width;
00082 y = offset / mp->avctx->width;
00083 if (y >= mp->avctx->height)
00084 continue;
00085 w = FFMIN(w, mp->avctx->width - x);
00086 h = FFMIN(h, mp->avctx->height - y);
00087 pixels = (uint16_t *)&mp->frame.data[0][y * mp->frame.linesize[0] + x * 2];
00088 while (h--) {
00089 mp->changes_map[offset] = w;
00090 if (read_color)
00091 for (i = 0; i < w; ++i)
00092 pixels[i] = color;
00093 offset += mp->avctx->width;
00094 pixels += mp->frame.linesize[0] / 2;
00095 }
00096 }
00097 }
00098
00099 static void mp_get_code(MotionPixelsContext *mp, GetBitContext *gb, int size, int code)
00100 {
00101 while (get_bits1(gb)) {
00102 ++size;
00103 if (size > mp->max_codes_bits) {
00104 av_log(mp->avctx, AV_LOG_ERROR, "invalid code size %d/%d\n", size, mp->max_codes_bits);
00105 return;
00106 }
00107 code <<= 1;
00108 mp_get_code(mp, gb, size, code + 1);
00109 }
00110 if (mp->current_codes_count >= MAX_HUFF_CODES) {
00111 av_log(mp->avctx, AV_LOG_ERROR, "too many codes\n");
00112 return;
00113 }
00114 mp->codes[mp->current_codes_count ].code = code;
00115 mp->codes[mp->current_codes_count++].size = size;
00116 }
00117
00118 static void mp_read_codes_table(MotionPixelsContext *mp, GetBitContext *gb)
00119 {
00120 if (mp->codes_count == 1) {
00121 mp->codes[0].delta = get_bits(gb, 4);
00122 } else {
00123 int i;
00124
00125 mp->max_codes_bits = get_bits(gb, 4);
00126 for (i = 0; i < mp->codes_count; ++i)
00127 mp->codes[i].delta = get_bits(gb, 4);
00128 mp->current_codes_count = 0;
00129 mp_get_code(mp, gb, 0, 0);
00130 }
00131 }
00132
00133 static int mp_gradient(MotionPixelsContext *mp, int component, int v)
00134 {
00135 int delta;
00136
00137 delta = (v - 7) * mp->gradient_scale[component];
00138 mp->gradient_scale[component] = (v == 0 || v == 14) ? 2 : 1;
00139 return delta;
00140 }
00141
00142 static YuvPixel mp_get_yuv_from_rgb(MotionPixelsContext *mp, int x, int y)
00143 {
00144 int color;
00145
00146 color = *(uint16_t *)&mp->frame.data[0][y * mp->frame.linesize[0] + x * 2];
00147 return mp_rgb_yuv_table[color];
00148 }
00149
00150 static void mp_set_rgb_from_yuv(MotionPixelsContext *mp, int x, int y, const YuvPixel *p)
00151 {
00152 int color;
00153
00154 color = mp_yuv_to_rgb(p->y, p->v, p->u, 1);
00155 *(uint16_t *)&mp->frame.data[0][y * mp->frame.linesize[0] + x * 2] = color;
00156 }
00157
00158 static int mp_get_vlc(MotionPixelsContext *mp, GetBitContext *gb)
00159 {
00160 int i;
00161
00162 i = (mp->codes_count == 1) ? 0 : get_vlc2(gb, mp->vlc.table, mp->max_codes_bits, 1);
00163 return mp->codes[i].delta;
00164 }
00165
00166 static void mp_decode_line(MotionPixelsContext *mp, GetBitContext *gb, int y)
00167 {
00168 YuvPixel p;
00169 const int y0 = y * mp->avctx->width;
00170 int w, i, x = 0;
00171
00172 p = mp->vpt[y];
00173 if (mp->changes_map[y0 + x] == 0) {
00174 memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale));
00175 ++x;
00176 }
00177 while (x < mp->avctx->width) {
00178 w = mp->changes_map[y0 + x];
00179 if (w != 0) {
00180 if ((y & 3) == 0) {
00181 if (mp->changes_map[y0 + x + mp->avctx->width] < w ||
00182 mp->changes_map[y0 + x + mp->avctx->width * 2] < w ||
00183 mp->changes_map[y0 + x + mp->avctx->width * 3] < w) {
00184 for (i = (x + 3) & ~3; i < x + w; i += 4) {
00185 mp->hpt[((y / 4) * mp->avctx->width + i) / 4] = mp_get_yuv_from_rgb(mp, i, y);
00186 }
00187 }
00188 }
00189 x += w;
00190 memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale));
00191 p = mp_get_yuv_from_rgb(mp, x - 1, y);
00192 } else {
00193 p.y += mp_gradient(mp, 0, mp_get_vlc(mp, gb));
00194 if ((x & 3) == 0) {
00195 if ((y & 3) == 0) {
00196 p.v += mp_gradient(mp, 1, mp_get_vlc(mp, gb));
00197 p.u += mp_gradient(mp, 2, mp_get_vlc(mp, gb));
00198 mp->hpt[((y / 4) * mp->avctx->width + x) / 4] = p;
00199 } else {
00200 p.v = mp->hpt[((y / 4) * mp->avctx->width + x) / 4].v;
00201 p.u = mp->hpt[((y / 4) * mp->avctx->width + x) / 4].u;
00202 }
00203 }
00204 mp_set_rgb_from_yuv(mp, x, y, &p);
00205 ++x;
00206 }
00207 }
00208 }
00209
00210 static void mp_decode_frame_helper(MotionPixelsContext *mp, GetBitContext *gb)
00211 {
00212 YuvPixel p;
00213 int y, y0;
00214
00215 for (y = 0; y < mp->avctx->height; ++y) {
00216 if (mp->changes_map[y * mp->avctx->width] != 0) {
00217 memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale));
00218 p = mp_get_yuv_from_rgb(mp, 0, y);
00219 } else {
00220 p.y += mp_gradient(mp, 0, mp_get_vlc(mp, gb));
00221 if ((y & 3) == 0) {
00222 p.v += mp_gradient(mp, 1, mp_get_vlc(mp, gb));
00223 p.u += mp_gradient(mp, 2, mp_get_vlc(mp, gb));
00224 }
00225 mp->vpt[y] = p;
00226 mp_set_rgb_from_yuv(mp, 0, y, &p);
00227 }
00228 }
00229 for (y0 = 0; y0 < 2; ++y0)
00230 for (y = y0; y < mp->avctx->height; y += 2)
00231 mp_decode_line(mp, gb, y);
00232 }
00233
00234 static int mp_decode_frame(AVCodecContext *avctx,
00235 void *data, int *data_size,
00236 AVPacket *avpkt)
00237 {
00238 const uint8_t *buf = avpkt->data;
00239 int buf_size = avpkt->size;
00240 MotionPixelsContext *mp = avctx->priv_data;
00241 GetBitContext gb;
00242 int i, count1, count2, sz;
00243
00244 mp->frame.reference = 3;
00245 mp->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
00246 if (avctx->reget_buffer(avctx, &mp->frame)) {
00247 av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
00248 return -1;
00249 }
00250
00251
00252 av_fast_malloc(&mp->bswapbuf, &mp->bswapbuf_size, buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
00253 if (!mp->bswapbuf)
00254 return AVERROR(ENOMEM);
00255 mp->dsp.bswap_buf((uint32_t *)mp->bswapbuf, (const uint32_t *)buf, buf_size / 4);
00256 if (buf_size & 3)
00257 memcpy(mp->bswapbuf + (buf_size & ~3), buf + (buf_size & ~3), buf_size & 3);
00258 memset(mp->bswapbuf + buf_size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
00259 init_get_bits(&gb, mp->bswapbuf, buf_size * 8);
00260
00261 memset(mp->changes_map, 0, avctx->width * avctx->height);
00262 for (i = !(avctx->extradata[1] & 2); i < 2; ++i) {
00263 count1 = get_bits(&gb, 12);
00264 count2 = get_bits(&gb, 12);
00265 mp_read_changes_map(mp, &gb, count1, 8, i);
00266 mp_read_changes_map(mp, &gb, count2, 4, i);
00267 }
00268
00269 mp->codes_count = get_bits(&gb, 4);
00270 if (mp->codes_count == 0)
00271 goto end;
00272
00273 if (mp->changes_map[0] == 0) {
00274 *(uint16_t *)mp->frame.data[0] = get_bits(&gb, 15);
00275 mp->changes_map[0] = 1;
00276 }
00277 mp_read_codes_table(mp, &gb);
00278
00279 sz = get_bits(&gb, 18);
00280 if (avctx->extradata[0] != 5)
00281 sz += get_bits(&gb, 18);
00282 if (sz == 0)
00283 goto end;
00284
00285 if (mp->max_codes_bits <= 0)
00286 goto end;
00287 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))
00288 goto end;
00289 mp_decode_frame_helper(mp, &gb);
00290 free_vlc(&mp->vlc);
00291
00292 end:
00293 *data_size = sizeof(AVFrame);
00294 *(AVFrame *)data = mp->frame;
00295 return buf_size;
00296 }
00297
00298 static av_cold int mp_decode_end(AVCodecContext *avctx)
00299 {
00300 MotionPixelsContext *mp = avctx->priv_data;
00301
00302 av_freep(&mp->changes_map);
00303 av_freep(&mp->vpt);
00304 av_freep(&mp->hpt);
00305 av_freep(&mp->bswapbuf);
00306 if (mp->frame.data[0])
00307 avctx->release_buffer(avctx, &mp->frame);
00308
00309 return 0;
00310 }
00311
00312 AVCodec ff_motionpixels_decoder = {
00313 .name = "motionpixels",
00314 .type = AVMEDIA_TYPE_VIDEO,
00315 .id = CODEC_ID_MOTIONPIXELS,
00316 .priv_data_size = sizeof(MotionPixelsContext),
00317 .init = mp_decode_init,
00318 .close = mp_decode_end,
00319 .decode = mp_decode_frame,
00320 .capabilities = CODEC_CAP_DR1,
00321 .long_name = NULL_IF_CONFIG_SMALL("Motion Pixels video"),
00322 };