LCOV - code coverage report
Current view: top level - libavcodec - rpza.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 92 119 77.3 %
Date: 2017-12-10 21:22:29 Functions: 4 4 100.0 %

          Line data    Source code
       1             : /*
       2             :  * Quicktime Video (RPZA) Video Decoder
       3             :  * Copyright (C) 2003 The FFmpeg project
       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             :  * QT RPZA Video Decoder by Roberto Togni
      25             :  * For more information about the RPZA format, visit:
      26             :  *   http://www.pcisys.net/~melanson/codecs/
      27             :  *
      28             :  * The RPZA decoder outputs RGB555 colorspace data.
      29             :  *
      30             :  * Note that this decoder reads big endian RGB555 pixel values from the
      31             :  * bytestream, arranges them in the host's endian order, and outputs
      32             :  * them to the final rendered map in the same host endian order. This is
      33             :  * intended behavior as the libavcodec documentation states that RGB555
      34             :  * pixels shall be stored in native CPU endianness.
      35             :  */
      36             : 
      37             : #include <stdint.h>
      38             : #include <stdio.h>
      39             : #include <stdlib.h>
      40             : #include <string.h>
      41             : 
      42             : #include "libavutil/internal.h"
      43             : #include "avcodec.h"
      44             : #include "bytestream.h"
      45             : #include "internal.h"
      46             : 
      47             : typedef struct RpzaContext {
      48             : 
      49             :     AVCodecContext *avctx;
      50             :     AVFrame *frame;
      51             : 
      52             :     GetByteContext gb;
      53             : } RpzaContext;
      54             : 
      55             : #define CHECK_BLOCK()                                                         \
      56             :     if (total_blocks < 1) {                                                    \
      57             :         av_log(s->avctx, AV_LOG_ERROR,                                         \
      58             :                "Block counter just went negative (this should not happen)\n"); \
      59             :         return AVERROR_INVALIDDATA;                                            \
      60             :     }                                                                          \
      61             : 
      62             : #define ADVANCE_BLOCK()             \
      63             :     {                               \
      64             :         pixel_ptr += 4;             \
      65             :         if (pixel_ptr >= width)     \
      66             :         {                           \
      67             :             pixel_ptr = 0;          \
      68             :             row_ptr  += stride * 4; \
      69             :         }                           \
      70             :         total_blocks--;             \
      71             :     }
      72             : 
      73          31 : static int rpza_decode_stream(RpzaContext *s)
      74             : {
      75          31 :     int width = s->avctx->width;
      76          31 :     int stride = s->frame->linesize[0] / 2;
      77          31 :     int row_inc = stride - 4;
      78             :     int chunk_size;
      79          31 :     uint16_t colorA = 0, colorB;
      80             :     uint16_t color4[4];
      81             :     uint16_t ta, tb;
      82          31 :     uint16_t *pixels = (uint16_t *)s->frame->data[0];
      83             : 
      84          31 :     int row_ptr = 0;
      85          31 :     int pixel_ptr = 0;
      86             :     int block_ptr;
      87             :     int pixel_x, pixel_y;
      88             :     int total_blocks;
      89             : 
      90             :     /* First byte is always 0xe1. Warn if it's different */
      91          31 :     if (bytestream2_peek_byte(&s->gb) != 0xe1)
      92           0 :         av_log(s->avctx, AV_LOG_ERROR, "First chunk byte is 0x%02x instead of 0xe1\n",
      93             :                bytestream2_peek_byte(&s->gb));
      94             : 
      95             :     /* Get chunk size, ignoring first byte */
      96          31 :     chunk_size = bytestream2_get_be32(&s->gb) & 0x00FFFFFF;
      97             : 
      98             :     /* If length mismatch use size from MOV file and try to decode anyway */
      99          31 :     if (chunk_size != bytestream2_get_bytes_left(&s->gb) + 4)
     100           0 :         av_log(s->avctx, AV_LOG_WARNING,
     101             :                "MOV chunk size %d != encoded chunk size %d\n",
     102             :                chunk_size,
     103           0 :                bytestream2_get_bytes_left(&s->gb) + 4
     104             :               );
     105             : 
     106             :     /* Number of 4x4 blocks in frame. */
     107          31 :     total_blocks = ((s->avctx->width + 3) / 4) * ((s->avctx->height + 3) / 4);
     108             : 
     109             :     /* Process chunk data */
     110       60235 :     while (bytestream2_get_bytes_left(&s->gb)) {
     111       60173 :         uint8_t opcode = bytestream2_get_byte(&s->gb); /* Get opcode */
     112             : 
     113       60173 :         int n_blocks = (opcode & 0x1f) + 1; /* Extract block counter from opcode */
     114             : 
     115             :         /* If opcode MSbit is 0, we need more data to decide what to do */
     116       60173 :         if ((opcode & 0x80) == 0) {
     117       48161 :             colorA = (opcode << 8) | bytestream2_get_byte(&s->gb);
     118       48161 :             opcode = 0;
     119       48161 :             if ((bytestream2_peek_byte(&s->gb) & 0x80) != 0) {
     120             :                 /* Must behave as opcode 110xxxxx, using colorA computed
     121             :                  * above. Use fake opcode 0x20 to enter switch block at
     122             :                  * the right place */
     123       48161 :                 opcode = 0x20;
     124       48161 :                 n_blocks = 1;
     125             :             }
     126             :         }
     127             : 
     128       60173 :         n_blocks = FFMIN(n_blocks, total_blocks);
     129             : 
     130       60173 :         switch (opcode & 0xe0) {
     131             : 
     132             :         /* Skip blocks */
     133       10393 :         case 0x80:
     134      119091 :             while (n_blocks--) {
     135       98305 :                 CHECK_BLOCK();
     136       98305 :                 ADVANCE_BLOCK();
     137             :             }
     138       10393 :             break;
     139             : 
     140             :         /* Fill blocks with one color */
     141        1619 :         case 0xa0:
     142        1619 :             colorA = bytestream2_get_be16(&s->gb);
     143        5572 :             while (n_blocks--) {
     144        2334 :                 CHECK_BLOCK();
     145        2334 :                 block_ptr = row_ptr + pixel_ptr;
     146       11670 :                 for (pixel_y = 0; pixel_y < 4; pixel_y++) {
     147       46680 :                     for (pixel_x = 0; pixel_x < 4; pixel_x++){
     148       37344 :                         pixels[block_ptr] = colorA;
     149       37344 :                         block_ptr++;
     150             :                     }
     151        9336 :                     block_ptr += row_inc;
     152             :                 }
     153        2334 :                 ADVANCE_BLOCK();
     154             :             }
     155        1619 :             break;
     156             : 
     157             :         /* Fill blocks with 4 colors */
     158           0 :         case 0xc0:
     159           0 :             colorA = bytestream2_get_be16(&s->gb);
     160       48161 :         case 0x20:
     161       48161 :             colorB = bytestream2_get_be16(&s->gb);
     162             : 
     163             :             /* sort out the colors */
     164       48161 :             color4[0] = colorB;
     165       48161 :             color4[1] = 0;
     166       48161 :             color4[2] = 0;
     167       48161 :             color4[3] = colorA;
     168             : 
     169             :             /* red components */
     170       48161 :             ta = (colorA >> 10) & 0x1F;
     171       48161 :             tb = (colorB >> 10) & 0x1F;
     172       48161 :             color4[1] |= ((11 * ta + 21 * tb) >> 5) << 10;
     173       48161 :             color4[2] |= ((21 * ta + 11 * tb) >> 5) << 10;
     174             : 
     175             :             /* green components */
     176       48161 :             ta = (colorA >> 5) & 0x1F;
     177       48161 :             tb = (colorB >> 5) & 0x1F;
     178       48161 :             color4[1] |= ((11 * ta + 21 * tb) >> 5) << 5;
     179       48161 :             color4[2] |= ((21 * ta + 11 * tb) >> 5) << 5;
     180             : 
     181             :             /* blue components */
     182       48161 :             ta = colorA & 0x1F;
     183       48161 :             tb = colorB & 0x1F;
     184       48161 :             color4[1] |= ((11 * ta + 21 * tb) >> 5);
     185       48161 :             color4[2] |= ((21 * ta + 11 * tb) >> 5);
     186             : 
     187       48161 :             if (bytestream2_get_bytes_left(&s->gb) < n_blocks * 4)
     188           0 :                 return AVERROR_INVALIDDATA;
     189      144483 :             while (n_blocks--) {
     190       48161 :                 CHECK_BLOCK();
     191       48161 :                 block_ptr = row_ptr + pixel_ptr;
     192      240805 :                 for (pixel_y = 0; pixel_y < 4; pixel_y++) {
     193      192644 :                     uint8_t index = bytestream2_get_byteu(&s->gb);
     194      963220 :                     for (pixel_x = 0; pixel_x < 4; pixel_x++){
     195      770576 :                         uint8_t idx = (index >> (2 * (3 - pixel_x))) & 0x03;
     196      770576 :                         pixels[block_ptr] = color4[idx];
     197      770576 :                         block_ptr++;
     198             :                     }
     199      192644 :                     block_ptr += row_inc;
     200             :                 }
     201       48161 :                 ADVANCE_BLOCK();
     202             :             }
     203       48161 :             break;
     204             : 
     205             :         /* Fill block with 16 colors */
     206           0 :         case 0x00:
     207           0 :             if (bytestream2_get_bytes_left(&s->gb) < 30)
     208           0 :                 return AVERROR_INVALIDDATA;
     209           0 :             CHECK_BLOCK();
     210           0 :             block_ptr = row_ptr + pixel_ptr;
     211           0 :             for (pixel_y = 0; pixel_y < 4; pixel_y++) {
     212           0 :                 for (pixel_x = 0; pixel_x < 4; pixel_x++){
     213             :                     /* We already have color of upper left pixel */
     214           0 :                     if ((pixel_y != 0) || (pixel_x != 0))
     215           0 :                         colorA = bytestream2_get_be16u(&s->gb);
     216           0 :                     pixels[block_ptr] = colorA;
     217           0 :                     block_ptr++;
     218             :                 }
     219           0 :                 block_ptr += row_inc;
     220             :             }
     221           0 :             ADVANCE_BLOCK();
     222           0 :             break;
     223             : 
     224             :         /* Unknown opcode */
     225           0 :         default:
     226           0 :             av_log(s->avctx, AV_LOG_ERROR, "Unknown opcode %d in rpza chunk."
     227             :                  " Skip remaining %d bytes of chunk data.\n", opcode,
     228             :                  bytestream2_get_bytes_left(&s->gb));
     229           0 :             return AVERROR_INVALIDDATA;
     230             :         } /* Opcode switch */
     231             :     }
     232             : 
     233          31 :     return 0;
     234             : }
     235             : 
     236           2 : static av_cold int rpza_decode_init(AVCodecContext *avctx)
     237             : {
     238           2 :     RpzaContext *s = avctx->priv_data;
     239             : 
     240           2 :     s->avctx = avctx;
     241           2 :     avctx->pix_fmt = AV_PIX_FMT_RGB555;
     242             : 
     243           2 :     s->frame = av_frame_alloc();
     244           2 :     if (!s->frame)
     245           0 :         return AVERROR(ENOMEM);
     246             : 
     247           2 :     return 0;
     248             : }
     249             : 
     250          31 : static int rpza_decode_frame(AVCodecContext *avctx,
     251             :                              void *data, int *got_frame,
     252             :                              AVPacket *avpkt)
     253             : {
     254          31 :     RpzaContext *s = avctx->priv_data;
     255             :     int ret;
     256             : 
     257          31 :     bytestream2_init(&s->gb, avpkt->data, avpkt->size);
     258             : 
     259          31 :     if ((ret = ff_reget_buffer(avctx, s->frame)) < 0)
     260           0 :         return ret;
     261             : 
     262          31 :     ret = rpza_decode_stream(s);
     263          31 :     if (ret < 0)
     264           0 :         return ret;
     265             : 
     266          31 :     if ((ret = av_frame_ref(data, s->frame)) < 0)
     267           0 :         return ret;
     268             : 
     269          31 :     *got_frame      = 1;
     270             : 
     271             :     /* always report that the buffer was completely consumed */
     272          31 :     return avpkt->size;
     273             : }
     274             : 
     275           2 : static av_cold int rpza_decode_end(AVCodecContext *avctx)
     276             : {
     277           2 :     RpzaContext *s = avctx->priv_data;
     278             : 
     279           2 :     av_frame_free(&s->frame);
     280             : 
     281           2 :     return 0;
     282             : }
     283             : 
     284             : AVCodec ff_rpza_decoder = {
     285             :     .name           = "rpza",
     286             :     .long_name      = NULL_IF_CONFIG_SMALL("QuickTime video (RPZA)"),
     287             :     .type           = AVMEDIA_TYPE_VIDEO,
     288             :     .id             = AV_CODEC_ID_RPZA,
     289             :     .priv_data_size = sizeof(RpzaContext),
     290             :     .init           = rpza_decode_init,
     291             :     .close          = rpza_decode_end,
     292             :     .decode         = rpza_decode_frame,
     293             :     .capabilities   = AV_CODEC_CAP_DR1,
     294             : };

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