yading@10: /*
yading@10:  * Ut Video decoder
yading@10:  * Copyright (c) 2011 Konstantin Shishkov
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: /**
yading@10:  * @file
yading@10:  * Ut Video decoder
yading@10:  */
yading@10: 
yading@10: #include <stdlib.h>
yading@10: 
yading@10: #include "libavutil/intreadwrite.h"
yading@10: #include "avcodec.h"
yading@10: #include "bytestream.h"
yading@10: #include "get_bits.h"
yading@10: #include "dsputil.h"
yading@10: #include "thread.h"
yading@10: #include "utvideo.h"
yading@10: 
yading@10: static int build_huff(const uint8_t *src, VLC *vlc, int *fsym)
yading@10: {
yading@10:     int i;
yading@10:     HuffEntry he[256];
yading@10:     int last;
yading@10:     uint32_t codes[256];
yading@10:     uint8_t bits[256];
yading@10:     uint8_t syms[256];
yading@10:     uint32_t code;
yading@10: 
yading@10:     *fsym = -1;
yading@10:     for (i = 0; i < 256; i++) {
yading@10:         he[i].sym = i;
yading@10:         he[i].len = *src++;
yading@10:     }
yading@10:     qsort(he, 256, sizeof(*he), ff_ut_huff_cmp_len);
yading@10: 
yading@10:     if (!he[0].len) {
yading@10:         *fsym = he[0].sym;
yading@10:         return 0;
yading@10:     }
yading@10:     if (he[0].len > 32)
yading@10:         return -1;
yading@10: 
yading@10:     last = 255;
yading@10:     while (he[last].len == 255 && last)
yading@10:         last--;
yading@10: 
yading@10:     code = 1;
yading@10:     for (i = last; i >= 0; i--) {
yading@10:         codes[i] = code >> (32 - he[i].len);
yading@10:         bits[i]  = he[i].len;
yading@10:         syms[i]  = he[i].sym;
yading@10:         code += 0x80000000u >> (he[i].len - 1);
yading@10:     }
yading@10: 
yading@10:     return ff_init_vlc_sparse(vlc, FFMIN(he[last].len, 9), last + 1,
yading@10:                               bits,  sizeof(*bits),  sizeof(*bits),
yading@10:                               codes, sizeof(*codes), sizeof(*codes),
yading@10:                               syms,  sizeof(*syms),  sizeof(*syms), 0);
yading@10: }
yading@10: 
yading@10: static int decode_plane(UtvideoContext *c, int plane_no,
yading@10:                         uint8_t *dst, int step, int stride,
yading@10:                         int width, int height,
yading@10:                         const uint8_t *src, int use_pred)
yading@10: {
yading@10:     int i, j, slice, pix;
yading@10:     int sstart, send;
yading@10:     VLC vlc;
yading@10:     GetBitContext gb;
yading@10:     int prev, fsym;
yading@10:     const int cmask = ~(!plane_no && c->avctx->pix_fmt == AV_PIX_FMT_YUV420P);
yading@10: 
yading@10:     if (build_huff(src, &vlc, &fsym)) {
yading@10:         av_log(c->avctx, AV_LOG_ERROR, "Cannot build Huffman codes\n");
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10:     if (fsym >= 0) { // build_huff reported a symbol to fill slices with
yading@10:         send = 0;
yading@10:         for (slice = 0; slice < c->slices; slice++) {
yading@10:             uint8_t *dest;
yading@10: 
yading@10:             sstart = send;
yading@10:             send   = (height * (slice + 1) / c->slices) & cmask;
yading@10:             dest   = dst + sstart * stride;
yading@10: 
yading@10:             prev = 0x80;
yading@10:             for (j = sstart; j < send; j++) {
yading@10:                 for (i = 0; i < width * step; i += step) {
yading@10:                     pix = fsym;
yading@10:                     if (use_pred) {
yading@10:                         prev += pix;
yading@10:                         pix   = prev;
yading@10:                     }
yading@10:                     dest[i] = pix;
yading@10:                 }
yading@10:                 dest += stride;
yading@10:             }
yading@10:         }
yading@10:         return 0;
yading@10:     }
yading@10: 
yading@10:     src      += 256;
yading@10: 
yading@10:     send = 0;
yading@10:     for (slice = 0; slice < c->slices; slice++) {
yading@10:         uint8_t *dest;
yading@10:         int slice_data_start, slice_data_end, slice_size;
yading@10: 
yading@10:         sstart = send;
yading@10:         send   = (height * (slice + 1) / c->slices) & cmask;
yading@10:         dest   = dst + sstart * stride;
yading@10: 
yading@10:         // slice offset and size validation was done earlier
yading@10:         slice_data_start = slice ? AV_RL32(src + slice * 4 - 4) : 0;
yading@10:         slice_data_end   = AV_RL32(src + slice * 4);
yading@10:         slice_size       = slice_data_end - slice_data_start;
yading@10: 
yading@10:         if (!slice_size) {
yading@10:             av_log(c->avctx, AV_LOG_ERROR, "Plane has more than one symbol "
yading@10:                    "yet a slice has a length of zero.\n");
yading@10:             goto fail;
yading@10:         }
yading@10: 
yading@10:         memcpy(c->slice_bits, src + slice_data_start + c->slices * 4,
yading@10:                slice_size);
yading@10:         memset(c->slice_bits + slice_size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
yading@10:         c->dsp.bswap_buf((uint32_t *) c->slice_bits, (uint32_t *) c->slice_bits,
yading@10:                          (slice_data_end - slice_data_start + 3) >> 2);
yading@10:         init_get_bits(&gb, c->slice_bits, slice_size * 8);
yading@10: 
yading@10:         prev = 0x80;
yading@10:         for (j = sstart; j < send; j++) {
yading@10:             for (i = 0; i < width * step; i += step) {
yading@10:                 if (get_bits_left(&gb) <= 0) {
yading@10:                     av_log(c->avctx, AV_LOG_ERROR,
yading@10:                            "Slice decoding ran out of bits\n");
yading@10:                     goto fail;
yading@10:                 }
yading@10:                 pix = get_vlc2(&gb, vlc.table, vlc.bits, 4);
yading@10:                 if (pix < 0) {
yading@10:                     av_log(c->avctx, AV_LOG_ERROR, "Decoding error\n");
yading@10:                     goto fail;
yading@10:                 }
yading@10:                 if (use_pred) {
yading@10:                     prev += pix;
yading@10:                     pix   = prev;
yading@10:                 }
yading@10:                 dest[i] = pix;
yading@10:             }
yading@10:             dest += stride;
yading@10:         }
yading@10:         if (get_bits_left(&gb) > 32)
yading@10:             av_log(c->avctx, AV_LOG_WARNING,
yading@10:                    "%d bits left after decoding slice\n", get_bits_left(&gb));
yading@10:     }
yading@10: 
yading@10:     ff_free_vlc(&vlc);
yading@10: 
yading@10:     return 0;
yading@10: fail:
yading@10:     ff_free_vlc(&vlc);
yading@10:     return AVERROR_INVALIDDATA;
yading@10: }
yading@10: 
yading@10: static void restore_rgb_planes(uint8_t *src, int step, int stride, int width,
yading@10:                                int height)
yading@10: {
yading@10:     int i, j;
yading@10:     uint8_t r, g, b;
yading@10: 
yading@10:     for (j = 0; j < height; j++) {
yading@10:         for (i = 0; i < width * step; i += step) {
yading@10:             r = src[i];
yading@10:             g = src[i + 1];
yading@10:             b = src[i + 2];
yading@10:             src[i]     = r + g - 0x80;
yading@10:             src[i + 2] = b + g - 0x80;
yading@10:         }
yading@10:         src += stride;
yading@10:     }
yading@10: }
yading@10: 
yading@10: static void restore_median(uint8_t *src, int step, int stride,
yading@10:                            int width, int height, int slices, int rmode)
yading@10: {
yading@10:     int i, j, slice;
yading@10:     int A, B, C;
yading@10:     uint8_t *bsrc;
yading@10:     int slice_start, slice_height;
yading@10:     const int cmask = ~rmode;
yading@10: 
yading@10:     for (slice = 0; slice < slices; slice++) {
yading@10:         slice_start  = ((slice * height) / slices) & cmask;
yading@10:         slice_height = ((((slice + 1) * height) / slices) & cmask) -
yading@10:                        slice_start;
yading@10: 
yading@10:         bsrc = src + slice_start * stride;
yading@10: 
yading@10:         // first line - left neighbour prediction
yading@10:         bsrc[0] += 0x80;
yading@10:         A = bsrc[0];
yading@10:         for (i = step; i < width * step; i += step) {
yading@10:             bsrc[i] += A;
yading@10:             A        = bsrc[i];
yading@10:         }
yading@10:         bsrc += stride;
yading@10:         if (slice_height == 1)
yading@10:             continue;
yading@10:         // second line - first element has top prediction, the rest uses median
yading@10:         C        = bsrc[-stride];
yading@10:         bsrc[0] += C;
yading@10:         A        = bsrc[0];
yading@10:         for (i = step; i < width * step; i += step) {
yading@10:             B        = bsrc[i - stride];
yading@10:             bsrc[i] += mid_pred(A, B, (uint8_t)(A + B - C));
yading@10:             C        = B;
yading@10:             A        = bsrc[i];
yading@10:         }
yading@10:         bsrc += stride;
yading@10:         // the rest of lines use continuous median prediction
yading@10:         for (j = 2; j < slice_height; j++) {
yading@10:             for (i = 0; i < width * step; i += step) {
yading@10:                 B        = bsrc[i - stride];
yading@10:                 bsrc[i] += mid_pred(A, B, (uint8_t)(A + B - C));
yading@10:                 C        = B;
yading@10:                 A        = bsrc[i];
yading@10:             }
yading@10:             bsrc += stride;
yading@10:         }
yading@10:     }
yading@10: }
yading@10: 
yading@10: /* UtVideo interlaced mode treats every two lines as a single one,
yading@10:  * so restoring function should take care of possible padding between
yading@10:  * two parts of the same "line".
yading@10:  */
yading@10: static void restore_median_il(uint8_t *src, int step, int stride,
yading@10:                               int width, int height, int slices, int rmode)
yading@10: {
yading@10:     int i, j, slice;
yading@10:     int A, B, C;
yading@10:     uint8_t *bsrc;
yading@10:     int slice_start, slice_height;
yading@10:     const int cmask   = ~(rmode ? 3 : 1);
yading@10:     const int stride2 = stride << 1;
yading@10: 
yading@10:     for (slice = 0; slice < slices; slice++) {
yading@10:         slice_start    = ((slice * height) / slices) & cmask;
yading@10:         slice_height   = ((((slice + 1) * height) / slices) & cmask) -
yading@10:                          slice_start;
yading@10:         slice_height >>= 1;
yading@10: 
yading@10:         bsrc = src + slice_start * stride;
yading@10: 
yading@10:         // first line - left neighbour prediction
yading@10:         bsrc[0] += 0x80;
yading@10:         A        = bsrc[0];
yading@10:         for (i = step; i < width * step; i += step) {
yading@10:             bsrc[i] += A;
yading@10:             A        = bsrc[i];
yading@10:         }
yading@10:         for (i = 0; i < width * step; i += step) {
yading@10:             bsrc[stride + i] += A;
yading@10:             A                 = bsrc[stride + i];
yading@10:         }
yading@10:         bsrc += stride2;
yading@10:         if (slice_height == 1)
yading@10:             continue;
yading@10:         // second line - first element has top prediction, the rest uses median
yading@10:         C        = bsrc[-stride2];
yading@10:         bsrc[0] += C;
yading@10:         A        = bsrc[0];
yading@10:         for (i = step; i < width * step; i += step) {
yading@10:             B        = bsrc[i - stride2];
yading@10:             bsrc[i] += mid_pred(A, B, (uint8_t)(A + B - C));
yading@10:             C        = B;
yading@10:             A        = bsrc[i];
yading@10:         }
yading@10:         for (i = 0; i < width * step; i += step) {
yading@10:             B                 = bsrc[i - stride];
yading@10:             bsrc[stride + i] += mid_pred(A, B, (uint8_t)(A + B - C));
yading@10:             C                 = B;
yading@10:             A                 = bsrc[stride + i];
yading@10:         }
yading@10:         bsrc += stride2;
yading@10:         // the rest of lines use continuous median prediction
yading@10:         for (j = 2; j < slice_height; j++) {
yading@10:             for (i = 0; i < width * step; i += step) {
yading@10:                 B        = bsrc[i - stride2];
yading@10:                 bsrc[i] += mid_pred(A, B, (uint8_t)(A + B - C));
yading@10:                 C        = B;
yading@10:                 A        = bsrc[i];
yading@10:             }
yading@10:             for (i = 0; i < width * step; i += step) {
yading@10:                 B                 = bsrc[i - stride];
yading@10:                 bsrc[i + stride] += mid_pred(A, B, (uint8_t)(A + B - C));
yading@10:                 C                 = B;
yading@10:                 A                 = bsrc[i + stride];
yading@10:             }
yading@10:             bsrc += stride2;
yading@10:         }
yading@10:     }
yading@10: }
yading@10: 
yading@10: static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
yading@10:                         AVPacket *avpkt)
yading@10: {
yading@10:     const uint8_t *buf = avpkt->data;
yading@10:     int buf_size = avpkt->size;
yading@10:     UtvideoContext *c = avctx->priv_data;
yading@10:     int i, j;
yading@10:     const uint8_t *plane_start[5];
yading@10:     int plane_size, max_slice_size = 0, slice_start, slice_end, slice_size;
yading@10:     int ret;
yading@10:     GetByteContext gb;
yading@10:     ThreadFrame frame = { .f = data };
yading@10: 
yading@10:     if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0)
yading@10:         return ret;
yading@10: 
yading@10:     /* parse plane structure to get frame flags and validate slice offsets */
yading@10:     bytestream2_init(&gb, buf, buf_size);
yading@10:     for (i = 0; i < c->planes; i++) {
yading@10:         plane_start[i] = gb.buffer;
yading@10:         if (bytestream2_get_bytes_left(&gb) < 256 + 4 * c->slices) {
yading@10:             av_log(avctx, AV_LOG_ERROR, "Insufficient data for a plane\n");
yading@10:             return AVERROR_INVALIDDATA;
yading@10:         }
yading@10:         bytestream2_skipu(&gb, 256);
yading@10:         slice_start = 0;
yading@10:         slice_end   = 0;
yading@10:         for (j = 0; j < c->slices; j++) {
yading@10:             slice_end   = bytestream2_get_le32u(&gb);
yading@10:             slice_size  = slice_end - slice_start;
yading@10:             if (slice_end < 0 || slice_size < 0 ||
yading@10:                 bytestream2_get_bytes_left(&gb) < slice_end) {
yading@10:                 av_log(avctx, AV_LOG_ERROR, "Incorrect slice size\n");
yading@10:                 return AVERROR_INVALIDDATA;
yading@10:             }
yading@10:             slice_start = slice_end;
yading@10:             max_slice_size = FFMAX(max_slice_size, slice_size);
yading@10:         }
yading@10:         plane_size = slice_end;
yading@10:         bytestream2_skipu(&gb, plane_size);
yading@10:     }
yading@10:     plane_start[c->planes] = gb.buffer;
yading@10:     if (bytestream2_get_bytes_left(&gb) < c->frame_info_size) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "Not enough data for frame information\n");
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10:     c->frame_info = bytestream2_get_le32u(&gb);
yading@10:     av_log(avctx, AV_LOG_DEBUG, "frame information flags %X\n", c->frame_info);
yading@10: 
yading@10:     c->frame_pred = (c->frame_info >> 8) & 3;
yading@10: 
yading@10:     if (c->frame_pred == PRED_GRADIENT) {
yading@10:         avpriv_request_sample(avctx, "Frame with gradient prediction");
yading@10:         return AVERROR_PATCHWELCOME;
yading@10:     }
yading@10: 
yading@10:     av_fast_malloc(&c->slice_bits, &c->slice_bits_size,
yading@10:                    max_slice_size + FF_INPUT_BUFFER_PADDING_SIZE);
yading@10: 
yading@10:     if (!c->slice_bits) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "Cannot allocate temporary buffer\n");
yading@10:         return AVERROR(ENOMEM);
yading@10:     }
yading@10: 
yading@10:     switch (c->avctx->pix_fmt) {
yading@10:     case AV_PIX_FMT_RGB24:
yading@10:     case AV_PIX_FMT_RGBA:
yading@10:         for (i = 0; i < c->planes; i++) {
yading@10:             ret = decode_plane(c, i, frame.f->data[0] + ff_ut_rgb_order[i],
yading@10:                                c->planes, frame.f->linesize[0], avctx->width,
yading@10:                                avctx->height, plane_start[i],
yading@10:                                c->frame_pred == PRED_LEFT);
yading@10:             if (ret)
yading@10:                 return ret;
yading@10:             if (c->frame_pred == PRED_MEDIAN) {
yading@10:                 if (!c->interlaced) {
yading@10:                     restore_median(frame.f->data[0] + ff_ut_rgb_order[i],
yading@10:                                    c->planes, frame.f->linesize[0], avctx->width,
yading@10:                                    avctx->height, c->slices, 0);
yading@10:                 } else {
yading@10:                     restore_median_il(frame.f->data[0] + ff_ut_rgb_order[i],
yading@10:                                       c->planes, frame.f->linesize[0],
yading@10:                                       avctx->width, avctx->height, c->slices,
yading@10:                                       0);
yading@10:                 }
yading@10:             }
yading@10:         }
yading@10:         restore_rgb_planes(frame.f->data[0], c->planes, frame.f->linesize[0],
yading@10:                            avctx->width, avctx->height);
yading@10:         break;
yading@10:     case AV_PIX_FMT_YUV420P:
yading@10:         for (i = 0; i < 3; i++) {
yading@10:             ret = decode_plane(c, i, frame.f->data[i], 1, frame.f->linesize[i],
yading@10:                                avctx->width >> !!i, avctx->height >> !!i,
yading@10:                                plane_start[i], c->frame_pred == PRED_LEFT);
yading@10:             if (ret)
yading@10:                 return ret;
yading@10:             if (c->frame_pred == PRED_MEDIAN) {
yading@10:                 if (!c->interlaced) {
yading@10:                     restore_median(frame.f->data[i], 1, frame.f->linesize[i],
yading@10:                                    avctx->width >> !!i, avctx->height >> !!i,
yading@10:                                    c->slices, !i);
yading@10:                 } else {
yading@10:                     restore_median_il(frame.f->data[i], 1, frame.f->linesize[i],
yading@10:                                       avctx->width  >> !!i,
yading@10:                                       avctx->height >> !!i,
yading@10:                                       c->slices, !i);
yading@10:                 }
yading@10:             }
yading@10:         }
yading@10:         break;
yading@10:     case AV_PIX_FMT_YUV422P:
yading@10:         for (i = 0; i < 3; i++) {
yading@10:             ret = decode_plane(c, i, frame.f->data[i], 1, frame.f->linesize[i],
yading@10:                                avctx->width >> !!i, avctx->height,
yading@10:                                plane_start[i], c->frame_pred == PRED_LEFT);
yading@10:             if (ret)
yading@10:                 return ret;
yading@10:             if (c->frame_pred == PRED_MEDIAN) {
yading@10:                 if (!c->interlaced) {
yading@10:                     restore_median(frame.f->data[i], 1, frame.f->linesize[i],
yading@10:                                    avctx->width >> !!i, avctx->height,
yading@10:                                    c->slices, 0);
yading@10:                 } else {
yading@10:                     restore_median_il(frame.f->data[i], 1, frame.f->linesize[i],
yading@10:                                       avctx->width >> !!i, avctx->height,
yading@10:                                       c->slices, 0);
yading@10:                 }
yading@10:             }
yading@10:         }
yading@10:         break;
yading@10:     }
yading@10: 
yading@10:     frame.f->key_frame = 1;
yading@10:     frame.f->pict_type = AV_PICTURE_TYPE_I;
yading@10:     frame.f->interlaced_frame = !!c->interlaced;
yading@10: 
yading@10:     *got_frame = 1;
yading@10: 
yading@10:     /* always report that the buffer was completely consumed */
yading@10:     return buf_size;
yading@10: }
yading@10: 
yading@10: static av_cold int decode_init(AVCodecContext *avctx)
yading@10: {
yading@10:     UtvideoContext * const c = avctx->priv_data;
yading@10: 
yading@10:     c->avctx = avctx;
yading@10: 
yading@10:     ff_dsputil_init(&c->dsp, avctx);
yading@10: 
yading@10:     if (avctx->extradata_size < 16) {
yading@10:         av_log(avctx, AV_LOG_ERROR,
yading@10:                "Insufficient extradata size %d, should be at least 16\n",
yading@10:                avctx->extradata_size);
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     av_log(avctx, AV_LOG_DEBUG, "Encoder version %d.%d.%d.%d\n",
yading@10:            avctx->extradata[3], avctx->extradata[2],
yading@10:            avctx->extradata[1], avctx->extradata[0]);
yading@10:     av_log(avctx, AV_LOG_DEBUG, "Original format %X\n",
yading@10:            AV_RB32(avctx->extradata + 4));
yading@10:     c->frame_info_size = AV_RL32(avctx->extradata + 8);
yading@10:     c->flags           = AV_RL32(avctx->extradata + 12);
yading@10: 
yading@10:     if (c->frame_info_size != 4)
yading@10:         avpriv_request_sample(avctx, "Frame info not 4 bytes");
yading@10:     av_log(avctx, AV_LOG_DEBUG, "Encoding parameters %08X\n", c->flags);
yading@10:     c->slices      = (c->flags >> 24) + 1;
yading@10:     c->compression = c->flags & 1;
yading@10:     c->interlaced  = c->flags & 0x800;
yading@10: 
yading@10:     c->slice_bits_size = 0;
yading@10: 
yading@10:     switch (avctx->codec_tag) {
yading@10:     case MKTAG('U', 'L', 'R', 'G'):
yading@10:         c->planes      = 3;
yading@10:         avctx->pix_fmt = AV_PIX_FMT_RGB24;
yading@10:         break;
yading@10:     case MKTAG('U', 'L', 'R', 'A'):
yading@10:         c->planes      = 4;
yading@10:         avctx->pix_fmt = AV_PIX_FMT_RGBA;
yading@10:         break;
yading@10:     case MKTAG('U', 'L', 'Y', '0'):
yading@10:         c->planes      = 3;
yading@10:         avctx->pix_fmt = AV_PIX_FMT_YUV420P;
yading@10:         break;
yading@10:     case MKTAG('U', 'L', 'Y', '2'):
yading@10:         c->planes      = 3;
yading@10:         avctx->pix_fmt = AV_PIX_FMT_YUV422P;
yading@10:         break;
yading@10:     default:
yading@10:         av_log(avctx, AV_LOG_ERROR, "Unknown Ut Video FOURCC provided (%08X)\n",
yading@10:                avctx->codec_tag);
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static av_cold int decode_end(AVCodecContext *avctx)
yading@10: {
yading@10:     UtvideoContext * const c = avctx->priv_data;
yading@10: 
yading@10:     av_freep(&c->slice_bits);
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: AVCodec ff_utvideo_decoder = {
yading@10:     .name           = "utvideo",
yading@10:     .type           = AVMEDIA_TYPE_VIDEO,
yading@10:     .id             = AV_CODEC_ID_UTVIDEO,
yading@10:     .priv_data_size = sizeof(UtvideoContext),
yading@10:     .init           = decode_init,
yading@10:     .close          = decode_end,
yading@10:     .decode         = decode_frame,
yading@10:     .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_FRAME_THREADS,
yading@10:     .long_name      = NULL_IF_CONFIG_SMALL("Ut Video"),
yading@10: };