LCOV - code coverage report
Current view: top level - libavcodec - vble.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 73 81 90.1 %
Date: 2017-12-15 11:05:35 Functions: 5 5 100.0 %

          Line data    Source code
       1             : /*
       2             :  * VBLE Decoder
       3             :  * Copyright (c) 2011 Derek Buitenhuis
       4             :  *
       5             :  * This file is part of FFmpeg.
       6             :  *
       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.
      11             :  *
      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.
      16             :  *
      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
      20             :  */
      21             : 
      22             : /**
      23             :  * @file
      24             :  * VBLE Decoder
      25             :  */
      26             : 
      27             : #include "libavutil/imgutils.h"
      28             : 
      29             : #define BITSTREAM_READER_LE
      30             : #include "avcodec.h"
      31             : #include "get_bits.h"
      32             : #include "internal.h"
      33             : #include "lossless_videodsp.h"
      34             : #include "mathops.h"
      35             : #include "thread.h"
      36             : 
      37             : typedef struct VBLEContext {
      38             :     AVCodecContext *avctx;
      39             :     LLVidDSPContext llviddsp;
      40             : 
      41             :     int            size;
      42             :     uint8_t        *val; ///< This array first holds the lengths of vlc symbols and then their value.
      43             : } VBLEContext;
      44             : 
      45           5 : static int vble_unpack(VBLEContext *ctx, GetBitContext *gb)
      46             : {
      47             :     int i;
      48           5 :     int allbits = 0;
      49             :     static const uint8_t LUT[256] = {
      50             :         8,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,4,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,
      51             :         5,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,4,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,
      52             :         6,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,4,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,
      53             :         5,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,4,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,
      54             :         7,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,4,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,
      55             :         5,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,4,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,
      56             :         6,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,4,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,
      57             :         5,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,4,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,
      58             :     };
      59             : 
      60             :     /* Read all the lengths in first */
      61     5888025 :     for (i = 0; i < ctx->size; i++) {
      62             :         /* At most we need to read 9 bits total to get indices up to 8 */
      63     5888021 :         int val = show_bits(gb, 8);
      64             : 
      65             :         // read reverse unary
      66     5888021 :         if (val) {
      67     5887971 :             val = LUT[val];
      68     5887971 :             skip_bits(gb, val + 1);
      69     5887971 :             ctx->val[i] = val;
      70             :         } else {
      71          50 :             skip_bits(gb, 8);
      72          50 :             if (!get_bits1(gb))
      73           1 :                 return -1;
      74          49 :             ctx->val[i] = 8;
      75             :         }
      76     5888020 :         allbits += ctx->val[i];
      77             :     }
      78             : 
      79             :     /* Check we have enough bits left */
      80           4 :     if (get_bits_left(gb) < allbits)
      81           0 :         return -1;
      82           4 :     return 0;
      83             : }
      84             : 
      85          12 : static void vble_restore_plane(VBLEContext *ctx, AVFrame *pic,
      86             :                                GetBitContext *gb, int plane,
      87             :                                int offset, int width, int height)
      88             : {
      89          12 :     uint8_t *dst = pic->data[plane];
      90          12 :     uint8_t *val = ctx->val + offset;
      91          12 :     int stride = pic->linesize[plane];
      92             :     int i, j, left, left_top;
      93             : 
      94        5772 :     for (i = 0; i < height; i++) {
      95     5535360 :         for (j = 0; j < width; j++) {
      96             :             /* get_bits can't take a length of 0 */
      97     5529600 :             if (val[j]) {
      98     3143754 :                 int v = (1 << val[j]) + get_bits(gb, val[j]) - 1;
      99     3143754 :                 val[j] = (v >> 1) ^ -(v & 1);
     100             :             }
     101             :         }
     102        5760 :         if (i) {
     103        5748 :             left = 0;
     104        5748 :             left_top = dst[-stride];
     105        5748 :             ctx->llviddsp.add_median_pred(dst, dst - stride, val,
     106             :                                           width, &left, &left_top);
     107             :         } else {
     108          12 :             dst[0] = val[0];
     109       10240 :             for (j = 1; j < width; j++)
     110       10228 :                 dst[j] = val[j] + dst[j - 1];
     111             :         }
     112        5760 :         dst += stride;
     113        5760 :         val += width;
     114             :     }
     115          12 : }
     116             : 
     117           5 : static int vble_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
     118             :                              AVPacket *avpkt)
     119             : {
     120           5 :     VBLEContext *ctx = avctx->priv_data;
     121           5 :     AVFrame *pic     = data;
     122             :     GetBitContext gb;
     123           5 :     const uint8_t *src = avpkt->data;
     124             :     int version;
     125           5 :     int offset = 0;
     126           5 :     int width_uv = avctx->width / 2, height_uv = avctx->height / 2;
     127             :     int ret;
     128           5 :     ThreadFrame frame = { .f = data };
     129             : 
     130           5 :     if (avpkt->size < 4 || avpkt->size - 4 > INT_MAX/8) {
     131           0 :         av_log(avctx, AV_LOG_ERROR, "Invalid packet size\n");
     132           0 :         return AVERROR_INVALIDDATA;
     133             :     }
     134             : 
     135             :     /* Allocate buffer */
     136           5 :     if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0)
     137           0 :         return ret;
     138             : 
     139             :     /* Set flags */
     140           5 :     pic->key_frame = 1;
     141           5 :     pic->pict_type = AV_PICTURE_TYPE_I;
     142             : 
     143             :     /* Version should always be 1 */
     144           5 :     version = AV_RL32(src);
     145             : 
     146           5 :     if (version != 1)
     147           0 :         av_log(avctx, AV_LOG_WARNING, "Unsupported VBLE Version: %d\n", version);
     148             : 
     149           5 :     init_get_bits(&gb, src + 4, (avpkt->size - 4) * 8);
     150             : 
     151             :     /* Unpack */
     152           5 :     if (vble_unpack(ctx, &gb) < 0) {
     153           1 :         av_log(avctx, AV_LOG_ERROR, "Invalid Code\n");
     154           1 :         return AVERROR_INVALIDDATA;
     155             :     }
     156             : 
     157             :     /* Restore planes. Should be almost identical to Huffyuv's. */
     158           4 :     vble_restore_plane(ctx, pic, &gb, 0, offset, avctx->width, avctx->height);
     159             : 
     160             :     /* Chroma */
     161           4 :     if (!(ctx->avctx->flags & AV_CODEC_FLAG_GRAY)) {
     162           4 :         offset += avctx->width * avctx->height;
     163           4 :         vble_restore_plane(ctx, pic, &gb, 1, offset, width_uv, height_uv);
     164             : 
     165           4 :         offset += width_uv * height_uv;
     166           4 :         vble_restore_plane(ctx, pic, &gb, 2, offset, width_uv, height_uv);
     167             :     }
     168             : 
     169           4 :     *got_frame       = 1;
     170             : 
     171           4 :     return avpkt->size;
     172             : }
     173             : 
     174           2 : static av_cold int vble_decode_close(AVCodecContext *avctx)
     175             : {
     176           2 :     VBLEContext *ctx = avctx->priv_data;
     177           2 :     av_freep(&ctx->val);
     178             : 
     179           2 :     return 0;
     180             : }
     181             : 
     182           2 : static av_cold int vble_decode_init(AVCodecContext *avctx)
     183             : {
     184           2 :     VBLEContext *ctx = avctx->priv_data;
     185             : 
     186             :     /* Stash for later use */
     187           2 :     ctx->avctx = avctx;
     188           2 :     ff_llviddsp_init(&ctx->llviddsp);
     189             : 
     190           2 :     avctx->pix_fmt = AV_PIX_FMT_YUV420P;
     191           2 :     avctx->bits_per_raw_sample = 8;
     192             : 
     193           2 :     ctx->size = av_image_get_buffer_size(avctx->pix_fmt,
     194             :                                          avctx->width, avctx->height, 1);
     195             : 
     196           2 :     ctx->val = av_malloc_array(ctx->size, sizeof(*ctx->val));
     197             : 
     198           2 :     if (!ctx->val) {
     199           0 :         av_log(avctx, AV_LOG_ERROR, "Could not allocate values buffer.\n");
     200           0 :         vble_decode_close(avctx);
     201           0 :         return AVERROR(ENOMEM);
     202             :     }
     203             : 
     204           2 :     return 0;
     205             : }
     206             : 
     207             : AVCodec ff_vble_decoder = {
     208             :     .name           = "vble",
     209             :     .long_name      = NULL_IF_CONFIG_SMALL("VBLE Lossless Codec"),
     210             :     .type           = AVMEDIA_TYPE_VIDEO,
     211             :     .id             = AV_CODEC_ID_VBLE,
     212             :     .priv_data_size = sizeof(VBLEContext),
     213             :     .init           = vble_decode_init,
     214             :     .close          = vble_decode_close,
     215             :     .decode         = vble_decode_frame,
     216             :     .capabilities   = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
     217             :     .init_thread_copy = ONLY_IF_THREADS_ENABLED(vble_decode_init),
     218             :     .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE,
     219             : };

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