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  1. /*
  2.  * Quicktime Planar RGB (8BPS) Video Decoder
  3.  * Copyright (C) 2003 Roberto Togni
  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 8BPS Video Decoder by Roberto Togni
  25.  * For more information about the 8BPS format, visit:
  26.  *   http://www.pcisys.net/~melanson/codecs/
  27.  *
  28.  * Supports: PAL8 (RGB 8bpp, paletted)
  29.  *         : BGR24 (RGB 24bpp) (can also output it as RGB32)
  30.  *         : RGB32 (RGB 32bpp, 4th plane is alpha)
  31.  *
  32.  */
  33.  
  34. #include <stdio.h>
  35. #include <stdlib.h>
  36. #include <string.h>
  37.  
  38. #include "libavutil/internal.h"
  39. #include "libavutil/intreadwrite.h"
  40. #include "avcodec.h"
  41. #include "internal.h"
  42.  
  43.  
  44. static const enum AVPixelFormat pixfmt_rgb24[] = {
  45.     AV_PIX_FMT_BGR24, AV_PIX_FMT_RGB32, AV_PIX_FMT_NONE };
  46.  
  47. typedef struct EightBpsContext {
  48.     AVCodecContext *avctx;
  49.  
  50.     unsigned char planes;
  51.     unsigned char planemap[4];
  52.  
  53.     uint32_t pal[256];
  54. } EightBpsContext;
  55.  
  56. static int decode_frame(AVCodecContext *avctx, void *data,
  57.                         int *got_frame, AVPacket *avpkt)
  58. {
  59.     AVFrame *frame = data;
  60.     const uint8_t *buf = avpkt->data;
  61.     int buf_size       = avpkt->size;
  62.     EightBpsContext * const c = avctx->priv_data;
  63.     const unsigned char *encoded = buf;
  64.     unsigned char *pixptr, *pixptr_end;
  65.     unsigned int height = avctx->height; // Real image height
  66.     unsigned int dlen, p, row;
  67.     const unsigned char *lp, *dp, *ep;
  68.     unsigned char count;
  69.     unsigned int planes     = c->planes;
  70.     unsigned char *planemap = c->planemap;
  71.     int ret;
  72.  
  73.     if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
  74.         return ret;
  75.  
  76.     ep = encoded + buf_size;
  77.  
  78.     /* Set data pointer after line lengths */
  79.     dp = encoded + planes * (height << 1);
  80.  
  81.     for (p = 0; p < planes; p++) {
  82.         /* Lines length pointer for this plane */
  83.         lp = encoded + p * (height << 1);
  84.  
  85.         /* Decode a plane */
  86.         for (row = 0; row < height; row++) {
  87.             pixptr = frame->data[0] + row * frame->linesize[0] + planemap[p];
  88.             pixptr_end = pixptr + frame->linesize[0];
  89.             if (ep - lp < row * 2 + 2)
  90.                 return AVERROR_INVALIDDATA;
  91.             dlen = av_be2ne16(*(const unsigned short *)(lp + row * 2));
  92.             /* Decode a row of this plane */
  93.             while (dlen > 0) {
  94.                 if (ep - dp <= 1)
  95.                     return AVERROR_INVALIDDATA;
  96.                 if ((count = *dp++) <= 127) {
  97.                     count++;
  98.                     dlen -= count + 1;
  99.                     if (pixptr_end - pixptr < count * planes)
  100.                         break;
  101.                     if (ep - dp < count)
  102.                         return AVERROR_INVALIDDATA;
  103.                     while (count--) {
  104.                         *pixptr = *dp++;
  105.                         pixptr += planes;
  106.                     }
  107.                 } else {
  108.                     count = 257 - count;
  109.                     if (pixptr_end - pixptr < count * planes)
  110.                         break;
  111.                     while (count--) {
  112.                         *pixptr = *dp;
  113.                         pixptr += planes;
  114.                     }
  115.                     dp++;
  116.                     dlen -= 2;
  117.                 }
  118.             }
  119.         }
  120.     }
  121.  
  122.     if (avctx->bits_per_coded_sample <= 8) {
  123.         const uint8_t *pal = av_packet_get_side_data(avpkt,
  124.                                                      AV_PKT_DATA_PALETTE,
  125.                                                      NULL);
  126.         if (pal) {
  127.             frame->palette_has_changed = 1;
  128.             memcpy(c->pal, pal, AVPALETTE_SIZE);
  129.         }
  130.  
  131.         memcpy (frame->data[1], c->pal, AVPALETTE_SIZE);
  132.     }
  133.  
  134.     *got_frame = 1;
  135.  
  136.     /* always report that the buffer was completely consumed */
  137.     return buf_size;
  138. }
  139.  
  140. static av_cold int decode_init(AVCodecContext *avctx)
  141. {
  142.     EightBpsContext * const c = avctx->priv_data;
  143.  
  144.     c->avctx       = avctx;
  145.  
  146.     switch (avctx->bits_per_coded_sample) {
  147.     case 8:
  148.         avctx->pix_fmt = AV_PIX_FMT_PAL8;
  149.         c->planes      = 1;
  150.         c->planemap[0] = 0; // 1st plane is palette indexes
  151.         break;
  152.     case 24:
  153.         avctx->pix_fmt = avctx->get_format(avctx, pixfmt_rgb24);
  154.         c->planes      = 3;
  155.         c->planemap[0] = 2; // 1st plane is red
  156.         c->planemap[1] = 1; // 2nd plane is green
  157.         c->planemap[2] = 0; // 3rd plane is blue
  158.         break;
  159.     case 32:
  160.         avctx->pix_fmt = AV_PIX_FMT_RGB32;
  161.         c->planes      = 4;
  162.         /* handle planemap setup later for decoding rgb24 data as rbg32 */
  163.         break;
  164.     default:
  165.         av_log(avctx, AV_LOG_ERROR, "Error: Unsupported color depth: %u.\n",
  166.                avctx->bits_per_coded_sample);
  167.         return AVERROR_INVALIDDATA;
  168.     }
  169.  
  170.     if (avctx->pix_fmt == AV_PIX_FMT_RGB32) {
  171.         c->planemap[0] = HAVE_BIGENDIAN ? 1 : 2; // 1st plane is red
  172.         c->planemap[1] = HAVE_BIGENDIAN ? 2 : 1; // 2nd plane is green
  173.         c->planemap[2] = HAVE_BIGENDIAN ? 3 : 0; // 3rd plane is blue
  174.         c->planemap[3] = HAVE_BIGENDIAN ? 0 : 3; // 4th plane is alpha
  175.     }
  176.     return 0;
  177. }
  178.  
  179. AVCodec ff_eightbps_decoder = {
  180.     .name           = "8bps",
  181.     .long_name      = NULL_IF_CONFIG_SMALL("QuickTime 8BPS video"),
  182.     .type           = AVMEDIA_TYPE_VIDEO,
  183.     .id             = AV_CODEC_ID_8BPS,
  184.     .priv_data_size = sizeof(EightBpsContext),
  185.     .init           = decode_init,
  186.     .decode         = decode_frame,
  187.     .capabilities   = CODEC_CAP_DR1,
  188. };
  189.