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 #include <stdio.h>
34 #include <stdlib.h>
35 #include <string.h>
36
37 #include "libavutil/internal.h"
38 #include "libavutil/intreadwrite.h"
39 #include "avcodec.h"
40 #include "codec_internal.h"
41 #include "decode.h"
42 #include "internal.h"
43
44
45 static const enum AVPixelFormat pixfmt_rgb24[] = {
46 AV_PIX_FMT_BGR24, AV_PIX_FMT_0RGB32, AV_PIX_FMT_NONE };
47
48 typedef struct EightBpsContext {
49 AVCodecContext *avctx;
50
51 unsigned char planes;
52 unsigned char planemap[4];
53
54 uint32_t pal[256];
55 } EightBpsContext;
56
decode_frame(AVCodecContext * avctx,AVFrame * frame,int * got_frame,AVPacket * avpkt)57 static int decode_frame(AVCodecContext *avctx, AVFrame *frame,
58 int *got_frame, AVPacket *avpkt)
59 {
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 px_inc;
70 unsigned int planes = c->planes;
71 unsigned char *planemap = c->planemap;
72 int ret;
73
74 if (buf_size < planes * height *2)
75 return AVERROR_INVALIDDATA;
76
77 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
78 return ret;
79
80 ep = encoded + buf_size;
81
82 /* Set data pointer after line lengths */
83 dp = encoded + planes * (height << 1);
84
85 px_inc = planes + (avctx->pix_fmt == AV_PIX_FMT_0RGB32);
86
87 for (p = 0; p < planes; p++) {
88 /* Lines length pointer for this plane */
89 lp = encoded + p * (height << 1);
90
91 /* Decode a plane */
92 for (row = 0; row < height; row++) {
93 pixptr = frame->data[0] + row * frame->linesize[0] + planemap[p];
94 pixptr_end = pixptr + frame->linesize[0];
95 if (ep - lp < row * 2 + 2)
96 return AVERROR_INVALIDDATA;
97 dlen = av_be2ne16(*(const unsigned short *)(lp + row * 2));
98 /* Decode a row of this plane */
99 while (dlen > 0) {
100 if (ep - dp <= 1)
101 return AVERROR_INVALIDDATA;
102 if ((count = *dp++) <= 127) {
103 count++;
104 dlen -= count + 1;
105 if (pixptr_end - pixptr < count * px_inc)
106 break;
107 if (ep - dp < count)
108 return AVERROR_INVALIDDATA;
109 while (count--) {
110 *pixptr = *dp++;
111 pixptr += px_inc;
112 }
113 } else {
114 count = 257 - count;
115 if (pixptr_end - pixptr < count * px_inc)
116 break;
117 while (count--) {
118 *pixptr = *dp;
119 pixptr += px_inc;
120 }
121 dp++;
122 dlen -= 2;
123 }
124 }
125 }
126 }
127
128 if (avctx->bits_per_coded_sample <= 8) {
129 frame->palette_has_changed = ff_copy_palette(c->pal, avpkt, avctx);
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
decode_init(AVCodecContext * avctx)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 = ff_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 const FFCodec ff_eightbps_decoder = {
180 .p.name = "8bps",
181 .p.long_name = NULL_IF_CONFIG_SMALL("QuickTime 8BPS video"),
182 .p.type = AVMEDIA_TYPE_VIDEO,
183 .p.id = AV_CODEC_ID_8BPS,
184 .priv_data_size = sizeof(EightBpsContext),
185 .init = decode_init,
186 FF_CODEC_DECODE_CB(decode_frame),
187 .p.capabilities = AV_CODEC_CAP_DR1,
188 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
189 };
190