Imported Debian version 2.5.0~trusty1.1
[deb_ffmpeg.git] / ffmpeg / libavcodec / 8bps.c
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 = 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 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 };