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 "internal.h"
41
42
43 static const enum AVPixelFormat pixfmt_rgb24[] = {
44 AV_PIX_FMT_BGR24, AV_PIX_FMT_0RGB32, AV_PIX_FMT_NONE };
45
46 typedef struct EightBpsContext {
47 AVCodecContext *avctx;
48
49 unsigned char planes;
50 unsigned char planemap[4];
51
52 uint32_t pal[256];
53 } EightBpsContext;
54
decode_frame(AVCodecContext * avctx,void * data,int * got_frame,AVPacket * avpkt)55 static int decode_frame(AVCodecContext *avctx, void *data,
56 int *got_frame, AVPacket *avpkt)
57 {
58 AVFrame *frame = data;
59 const uint8_t *buf = avpkt->data;
60 int buf_size = avpkt->size;
61 EightBpsContext * const c = avctx->priv_data;
62 const unsigned char *encoded = buf;
63 unsigned char *pixptr, *pixptr_end;
64 unsigned int height = avctx->height; // Real image height
65 unsigned int dlen, p, row;
66 const unsigned char *lp, *dp, *ep;
67 unsigned char count;
68 unsigned int px_inc;
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 px_inc = planes + (avctx->pix_fmt == AV_PIX_FMT_0RGB32);
82
83 for (p = 0; p < planes; p++) {
84 /* Lines length pointer for this plane */
85 lp = encoded + p * (height << 1);
86
87 /* Decode a plane */
88 for (row = 0; row < height; row++) {
89 pixptr = frame->data[0] + row * frame->linesize[0] + planemap[p];
90 pixptr_end = pixptr + frame->linesize[0];
91 if (ep - lp < row * 2 + 2)
92 return AVERROR_INVALIDDATA;
93 dlen = av_be2ne16(*(const unsigned short *)(lp + row * 2));
94 /* Decode a row of this plane */
95 while (dlen > 0) {
96 if (ep - dp <= 1)
97 return AVERROR_INVALIDDATA;
98 if ((count = *dp++) <= 127) {
99 count++;
100 dlen -= count + 1;
101 if (pixptr_end - pixptr < count * px_inc)
102 break;
103 if (ep - dp < count)
104 return AVERROR_INVALIDDATA;
105 while (count--) {
106 *pixptr = *dp++;
107 pixptr += px_inc;
108 }
109 } else {
110 count = 257 - count;
111 if (pixptr_end - pixptr < count * px_inc)
112 break;
113 while (count--) {
114 *pixptr = *dp;
115 pixptr += px_inc;
116 }
117 dp++;
118 dlen -= 2;
119 }
120 }
121 }
122 }
123
124 if (avctx->bits_per_coded_sample <= 8) {
125 buffer_size_t size;
126 const uint8_t *pal = av_packet_get_side_data(avpkt,
127 AV_PKT_DATA_PALETTE,
128 &size);
129 if (pal && size == AVPALETTE_SIZE) {
130 frame->palette_has_changed = 1;
131 memcpy(c->pal, pal, AVPALETTE_SIZE);
132 } else if (pal) {
133 av_log(avctx, AV_LOG_ERROR, "Palette size %d is wrong\n", size);
134 }
135
136 memcpy (frame->data[1], c->pal, AVPALETTE_SIZE);
137 }
138
139 *got_frame = 1;
140
141 /* always report that the buffer was completely consumed */
142 return buf_size;
143 }
144
decode_init(AVCodecContext * avctx)145 static av_cold int decode_init(AVCodecContext *avctx)
146 {
147 EightBpsContext * const c = avctx->priv_data;
148
149 c->avctx = avctx;
150
151 switch (avctx->bits_per_coded_sample) {
152 case 8:
153 avctx->pix_fmt = AV_PIX_FMT_PAL8;
154 c->planes = 1;
155 c->planemap[0] = 0; // 1st plane is palette indexes
156 break;
157 case 24:
158 avctx->pix_fmt = ff_get_format(avctx, pixfmt_rgb24);
159 c->planes = 3;
160 c->planemap[0] = 2; // 1st plane is red
161 c->planemap[1] = 1; // 2nd plane is green
162 c->planemap[2] = 0; // 3rd plane is blue
163 break;
164 case 32:
165 avctx->pix_fmt = AV_PIX_FMT_RGB32;
166 c->planes = 4;
167 /* handle planemap setup later for decoding rgb24 data as rbg32 */
168 break;
169 default:
170 av_log(avctx, AV_LOG_ERROR, "Error: Unsupported color depth: %u.\n",
171 avctx->bits_per_coded_sample);
172 return AVERROR_INVALIDDATA;
173 }
174
175 if (avctx->pix_fmt == AV_PIX_FMT_RGB32) {
176 c->planemap[0] = HAVE_BIGENDIAN ? 1 : 2; // 1st plane is red
177 c->planemap[1] = HAVE_BIGENDIAN ? 2 : 1; // 2nd plane is green
178 c->planemap[2] = HAVE_BIGENDIAN ? 3 : 0; // 3rd plane is blue
179 c->planemap[3] = HAVE_BIGENDIAN ? 0 : 3; // 4th plane is alpha
180 }
181 return 0;
182 }
183
184 AVCodec ff_eightbps_decoder = {
185 .name = "8bps",
186 .long_name = NULL_IF_CONFIG_SMALL("QuickTime 8BPS video"),
187 .type = AVMEDIA_TYPE_VIDEO,
188 .id = AV_CODEC_ID_8BPS,
189 .priv_data_size = sizeof(EightBpsContext),
190 .init = decode_init,
191 .decode = decode_frame,
192 .capabilities = AV_CODEC_CAP_DR1,
193 };
194