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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 = 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 | }; |