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00025 #include "libavutil/imgutils.h"
00026 #include "avcodec.h"
00027 #include "get_bits.h"
00028 #include "dnxhddata.h"
00029 #include "dsputil.h"
00030
00031 typedef struct {
00032 AVCodecContext *avctx;
00033 AVFrame picture;
00034 GetBitContext gb;
00035 int cid;
00036 unsigned int width, height;
00037 unsigned int mb_width, mb_height;
00038 uint32_t mb_scan_index[68];
00039 int cur_field;
00040 VLC ac_vlc, dc_vlc, run_vlc;
00041 int last_dc[3];
00042 DSPContext dsp;
00043 DECLARE_ALIGNED(16, DCTELEM, blocks)[8][64];
00044 ScanTable scantable;
00045 const CIDEntry *cid_table;
00046 } DNXHDContext;
00047
00048 #define DNXHD_VLC_BITS 9
00049 #define DNXHD_DC_VLC_BITS 7
00050
00051 static av_cold int dnxhd_decode_init(AVCodecContext *avctx)
00052 {
00053 DNXHDContext *ctx = avctx->priv_data;
00054
00055 ctx->avctx = avctx;
00056 dsputil_init(&ctx->dsp, avctx);
00057 avctx->coded_frame = &ctx->picture;
00058 ctx->picture.type = FF_I_TYPE;
00059 ctx->picture.key_frame = 1;
00060 return 0;
00061 }
00062
00063 static int dnxhd_init_vlc(DNXHDContext *ctx, int cid)
00064 {
00065 if (!ctx->cid_table) {
00066 int index;
00067
00068 if ((index = ff_dnxhd_get_cid_table(cid)) < 0) {
00069 av_log(ctx->avctx, AV_LOG_ERROR, "unsupported cid %d\n", cid);
00070 return -1;
00071 }
00072 ctx->cid_table = &ff_dnxhd_cid_table[index];
00073 init_vlc(&ctx->ac_vlc, DNXHD_VLC_BITS, 257,
00074 ctx->cid_table->ac_bits, 1, 1,
00075 ctx->cid_table->ac_codes, 2, 2, 0);
00076 init_vlc(&ctx->dc_vlc, DNXHD_DC_VLC_BITS, ctx->cid_table->bit_depth+4,
00077 ctx->cid_table->dc_bits, 1, 1,
00078 ctx->cid_table->dc_codes, 1, 1, 0);
00079 init_vlc(&ctx->run_vlc, DNXHD_VLC_BITS, 62,
00080 ctx->cid_table->run_bits, 1, 1,
00081 ctx->cid_table->run_codes, 2, 2, 0);
00082
00083 ff_init_scantable(ctx->dsp.idct_permutation, &ctx->scantable, ff_zigzag_direct);
00084 }
00085 return 0;
00086 }
00087
00088 static int dnxhd_decode_header(DNXHDContext *ctx, const uint8_t *buf, int buf_size, int first_field)
00089 {
00090 static const uint8_t header_prefix[] = { 0x00, 0x00, 0x02, 0x80, 0x01 };
00091 int i;
00092
00093 if (buf_size < 0x280)
00094 return -1;
00095
00096 if (memcmp(buf, header_prefix, 5)) {
00097 av_log(ctx->avctx, AV_LOG_ERROR, "error in header\n");
00098 return -1;
00099 }
00100 if (buf[5] & 2) {
00101 ctx->cur_field = buf[5] & 1;
00102 ctx->picture.interlaced_frame = 1;
00103 ctx->picture.top_field_first = first_field ^ ctx->cur_field;
00104 av_log(ctx->avctx, AV_LOG_DEBUG, "interlaced %d, cur field %d\n", buf[5] & 3, ctx->cur_field);
00105 }
00106
00107 ctx->height = AV_RB16(buf + 0x18);
00108 ctx->width = AV_RB16(buf + 0x1a);
00109
00110 av_dlog(ctx->avctx, "width %d, heigth %d\n", ctx->width, ctx->height);
00111
00112 if (buf[0x21] & 0x40) {
00113 av_log(ctx->avctx, AV_LOG_ERROR, "10 bit per component\n");
00114 return -1;
00115 }
00116
00117 ctx->cid = AV_RB32(buf + 0x28);
00118 av_dlog(ctx->avctx, "compression id %d\n", ctx->cid);
00119
00120 if (dnxhd_init_vlc(ctx, ctx->cid) < 0)
00121 return -1;
00122
00123 if (buf_size < ctx->cid_table->coding_unit_size) {
00124 av_log(ctx->avctx, AV_LOG_ERROR, "incorrect frame size\n");
00125 return -1;
00126 }
00127
00128 ctx->mb_width = ctx->width>>4;
00129 ctx->mb_height = buf[0x16d];
00130
00131 av_dlog(ctx->avctx, "mb width %d, mb height %d\n", ctx->mb_width, ctx->mb_height);
00132
00133 if ((ctx->height+15)>>4 == ctx->mb_height && ctx->picture.interlaced_frame)
00134 ctx->height <<= 1;
00135
00136 if (ctx->mb_height > 68 ||
00137 (ctx->mb_height<<ctx->picture.interlaced_frame) > (ctx->height+15)>>4) {
00138 av_log(ctx->avctx, AV_LOG_ERROR, "mb height too big: %d\n", ctx->mb_height);
00139 return -1;
00140 }
00141
00142 for (i = 0; i < ctx->mb_height; i++) {
00143 ctx->mb_scan_index[i] = AV_RB32(buf + 0x170 + (i<<2));
00144 av_dlog(ctx->avctx, "mb scan index %d\n", ctx->mb_scan_index[i]);
00145 if (buf_size < ctx->mb_scan_index[i] + 0x280) {
00146 av_log(ctx->avctx, AV_LOG_ERROR, "invalid mb scan index\n");
00147 return -1;
00148 }
00149 }
00150
00151 return 0;
00152 }
00153
00154 static int dnxhd_decode_dc(DNXHDContext *ctx)
00155 {
00156 int len;
00157
00158 len = get_vlc2(&ctx->gb, ctx->dc_vlc.table, DNXHD_DC_VLC_BITS, 1);
00159 return len ? get_xbits(&ctx->gb, len) : 0;
00160 }
00161
00162 static void dnxhd_decode_dct_block(DNXHDContext *ctx, DCTELEM *block, int n, int qscale)
00163 {
00164 int i, j, index, index2;
00165 int level, component, sign;
00166 const uint8_t *weigth_matrix;
00167
00168 if (n&2) {
00169 component = 1 + (n&1);
00170 weigth_matrix = ctx->cid_table->chroma_weight;
00171 } else {
00172 component = 0;
00173 weigth_matrix = ctx->cid_table->luma_weight;
00174 }
00175
00176 ctx->last_dc[component] += dnxhd_decode_dc(ctx);
00177 block[0] = ctx->last_dc[component];
00178
00179 for (i = 1; ; i++) {
00180 index = get_vlc2(&ctx->gb, ctx->ac_vlc.table, DNXHD_VLC_BITS, 2);
00181
00182 level = ctx->cid_table->ac_level[index];
00183 if (!level) {
00184
00185 return;
00186 }
00187 sign = get_sbits(&ctx->gb, 1);
00188
00189 if (ctx->cid_table->ac_index_flag[index]) {
00190 level += get_bits(&ctx->gb, ctx->cid_table->index_bits)<<6;
00191 }
00192
00193 if (ctx->cid_table->ac_run_flag[index]) {
00194 index2 = get_vlc2(&ctx->gb, ctx->run_vlc.table, DNXHD_VLC_BITS, 2);
00195 i += ctx->cid_table->run[index2];
00196 }
00197
00198 if (i > 63) {
00199 av_log(ctx->avctx, AV_LOG_ERROR, "ac tex damaged %d, %d\n", n, i);
00200 return;
00201 }
00202
00203 j = ctx->scantable.permutated[i];
00204
00205
00206 level = (2*level+1) * qscale * weigth_matrix[i];
00207 if (ctx->cid_table->bit_depth == 10) {
00208 if (weigth_matrix[i] != 8)
00209 level += 8;
00210 level >>= 4;
00211 } else {
00212 if (weigth_matrix[i] != 32)
00213 level += 32;
00214 level >>= 6;
00215 }
00216
00217 block[j] = (level^sign) - sign;
00218 }
00219 }
00220
00221 static int dnxhd_decode_macroblock(DNXHDContext *ctx, int x, int y)
00222 {
00223 int dct_linesize_luma = ctx->picture.linesize[0];
00224 int dct_linesize_chroma = ctx->picture.linesize[1];
00225 uint8_t *dest_y, *dest_u, *dest_v;
00226 int dct_offset;
00227 int qscale, i;
00228
00229 qscale = get_bits(&ctx->gb, 11);
00230 skip_bits1(&ctx->gb);
00231
00232
00233 for (i = 0; i < 8; i++) {
00234 ctx->dsp.clear_block(ctx->blocks[i]);
00235 dnxhd_decode_dct_block(ctx, ctx->blocks[i], i, qscale);
00236 }
00237
00238 if (ctx->picture.interlaced_frame) {
00239 dct_linesize_luma <<= 1;
00240 dct_linesize_chroma <<= 1;
00241 }
00242
00243 dest_y = ctx->picture.data[0] + ((y * dct_linesize_luma) << 4) + (x << 4);
00244 dest_u = ctx->picture.data[1] + ((y * dct_linesize_chroma) << 4) + (x << 3);
00245 dest_v = ctx->picture.data[2] + ((y * dct_linesize_chroma) << 4) + (x << 3);
00246
00247 if (ctx->cur_field) {
00248 dest_y += ctx->picture.linesize[0];
00249 dest_u += ctx->picture.linesize[1];
00250 dest_v += ctx->picture.linesize[2];
00251 }
00252
00253 dct_offset = dct_linesize_luma << 3;
00254 ctx->dsp.idct_put(dest_y, dct_linesize_luma, ctx->blocks[0]);
00255 ctx->dsp.idct_put(dest_y + 8, dct_linesize_luma, ctx->blocks[1]);
00256 ctx->dsp.idct_put(dest_y + dct_offset, dct_linesize_luma, ctx->blocks[4]);
00257 ctx->dsp.idct_put(dest_y + dct_offset + 8, dct_linesize_luma, ctx->blocks[5]);
00258
00259 if (!(ctx->avctx->flags & CODEC_FLAG_GRAY)) {
00260 dct_offset = dct_linesize_chroma << 3;
00261 ctx->dsp.idct_put(dest_u, dct_linesize_chroma, ctx->blocks[2]);
00262 ctx->dsp.idct_put(dest_v, dct_linesize_chroma, ctx->blocks[3]);
00263 ctx->dsp.idct_put(dest_u + dct_offset, dct_linesize_chroma, ctx->blocks[6]);
00264 ctx->dsp.idct_put(dest_v + dct_offset, dct_linesize_chroma, ctx->blocks[7]);
00265 }
00266
00267 return 0;
00268 }
00269
00270 static int dnxhd_decode_macroblocks(DNXHDContext *ctx, const uint8_t *buf, int buf_size)
00271 {
00272 int x, y;
00273 for (y = 0; y < ctx->mb_height; y++) {
00274 ctx->last_dc[0] =
00275 ctx->last_dc[1] =
00276 ctx->last_dc[2] = 1<<(ctx->cid_table->bit_depth+2);
00277 init_get_bits(&ctx->gb, buf + ctx->mb_scan_index[y], (buf_size - ctx->mb_scan_index[y]) << 3);
00278 for (x = 0; x < ctx->mb_width; x++) {
00279
00280 dnxhd_decode_macroblock(ctx, x, y);
00281
00282 }
00283 }
00284 return 0;
00285 }
00286
00287 static int dnxhd_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
00288 AVPacket *avpkt)
00289 {
00290 const uint8_t *buf = avpkt->data;
00291 int buf_size = avpkt->size;
00292 DNXHDContext *ctx = avctx->priv_data;
00293 AVFrame *picture = data;
00294 int first_field = 1;
00295
00296 av_dlog(avctx, "frame size %d\n", buf_size);
00297
00298 decode_coding_unit:
00299 if (dnxhd_decode_header(ctx, buf, buf_size, first_field) < 0)
00300 return -1;
00301
00302 if ((avctx->width || avctx->height) &&
00303 (ctx->width != avctx->width || ctx->height != avctx->height)) {
00304 av_log(avctx, AV_LOG_WARNING, "frame size changed: %dx%d -> %dx%d\n",
00305 avctx->width, avctx->height, ctx->width, ctx->height);
00306 first_field = 1;
00307 }
00308
00309 avctx->pix_fmt = PIX_FMT_YUV422P;
00310 if (av_image_check_size(ctx->width, ctx->height, 0, avctx))
00311 return -1;
00312 avcodec_set_dimensions(avctx, ctx->width, ctx->height);
00313
00314 if (first_field) {
00315 if (ctx->picture.data[0])
00316 avctx->release_buffer(avctx, &ctx->picture);
00317 if (avctx->get_buffer(avctx, &ctx->picture) < 0) {
00318 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
00319 return -1;
00320 }
00321 }
00322
00323 dnxhd_decode_macroblocks(ctx, buf + 0x280, buf_size - 0x280);
00324
00325 if (first_field && ctx->picture.interlaced_frame) {
00326 buf += ctx->cid_table->coding_unit_size;
00327 buf_size -= ctx->cid_table->coding_unit_size;
00328 first_field = 0;
00329 goto decode_coding_unit;
00330 }
00331
00332 *picture = ctx->picture;
00333 *data_size = sizeof(AVPicture);
00334 return buf_size;
00335 }
00336
00337 static av_cold int dnxhd_decode_close(AVCodecContext *avctx)
00338 {
00339 DNXHDContext *ctx = avctx->priv_data;
00340
00341 if (ctx->picture.data[0])
00342 avctx->release_buffer(avctx, &ctx->picture);
00343 free_vlc(&ctx->ac_vlc);
00344 free_vlc(&ctx->dc_vlc);
00345 free_vlc(&ctx->run_vlc);
00346 return 0;
00347 }
00348
00349 AVCodec ff_dnxhd_decoder = {
00350 "dnxhd",
00351 AVMEDIA_TYPE_VIDEO,
00352 CODEC_ID_DNXHD,
00353 sizeof(DNXHDContext),
00354 dnxhd_decode_init,
00355 NULL,
00356 dnxhd_decode_close,
00357 dnxhd_decode_frame,
00358 CODEC_CAP_DR1,
00359 .long_name = NULL_IF_CONFIG_SMALL("VC3/DNxHD"),
00360 };