lavc: Add an internal wrapper around get_format()
[libav.git] / libavcodec / 8bps.c
1 /*
2 * Quicktime Planar RGB (8BPS) Video Decoder
3 * Copyright (C) 2003 Roberto Togni
4 *
5 * This file is part of Libav.
6 *
7 * Libav 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 * Libav 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 Libav; 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 probably alpha and it's ignored)
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 px_inc;
70 unsigned int planes = c->planes;
71 unsigned char *planemap = c->planemap;
72 int ret;
73
74 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) {
75 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
76 return ret;
77 }
78
79 ep = encoded + buf_size;
80
81 /* Set data pointer after line lengths */
82 dp = encoded + planes * (height << 1);
83
84 /* Ignore alpha plane, don't know what to do with it */
85 if (planes == 4)
86 planes--;
87
88 px_inc = planes + (avctx->pix_fmt == AV_PIX_FMT_RGB32);
89
90 for (p = 0; p < planes; p++) {
91 /* Lines length pointer for this plane */
92 lp = encoded + p * (height << 1);
93
94 /* Decode a plane */
95 for (row = 0; row < height; row++) {
96 pixptr = frame->data[0] + row * frame->linesize[0] + planemap[p];
97 pixptr_end = pixptr + frame->linesize[0];
98 if (ep - lp < row * 2 + 2)
99 return AVERROR_INVALIDDATA;
100 dlen = av_be2ne16(*(const unsigned short *)(lp + row * 2));
101 /* Decode a row of this plane */
102 while (dlen > 0) {
103 if (ep - dp <= 1)
104 return AVERROR_INVALIDDATA;
105 if ((count = *dp++) <= 127) {
106 count++;
107 dlen -= count + 1;
108 if (pixptr_end - pixptr < count * px_inc)
109 break;
110 if (ep - dp < count)
111 return AVERROR_INVALIDDATA;
112 while (count--) {
113 *pixptr = *dp++;
114 pixptr += px_inc;
115 }
116 } else {
117 count = 257 - count;
118 if (pixptr_end - pixptr < count * px_inc)
119 break;
120 while (count--) {
121 *pixptr = *dp;
122 pixptr += px_inc;
123 }
124 dp++;
125 dlen -= 2;
126 }
127 }
128 }
129 }
130
131 if (avctx->bits_per_coded_sample <= 8) {
132 const uint8_t *pal = av_packet_get_side_data(avpkt,
133 AV_PKT_DATA_PALETTE,
134 NULL);
135 if (pal) {
136 frame->palette_has_changed = 1;
137 memcpy(c->pal, pal, AVPALETTE_SIZE);
138 }
139
140 memcpy (frame->data[1], c->pal, AVPALETTE_SIZE);
141 }
142
143 *got_frame = 1;
144
145 /* always report that the buffer was completely consumed */
146 return buf_size;
147 }
148
149 static av_cold int decode_init(AVCodecContext *avctx)
150 {
151 EightBpsContext * const c = avctx->priv_data;
152
153 c->avctx = avctx;
154
155 switch (avctx->bits_per_coded_sample) {
156 case 8:
157 avctx->pix_fmt = AV_PIX_FMT_PAL8;
158 c->planes = 1;
159 c->planemap[0] = 0; // 1st plane is palette indexes
160 break;
161 case 24:
162 avctx->pix_fmt = ff_get_format(avctx, pixfmt_rgb24);
163 c->planes = 3;
164 c->planemap[0] = 2; // 1st plane is red
165 c->planemap[1] = 1; // 2nd plane is green
166 c->planemap[2] = 0; // 3rd plane is blue
167 break;
168 case 32:
169 avctx->pix_fmt = AV_PIX_FMT_RGB32;
170 c->planes = 4;
171 /* handle planemap setup later for decoding rgb24 data as rbg32 */
172 break;
173 default:
174 av_log(avctx, AV_LOG_ERROR, "Error: Unsupported color depth: %u.\n",
175 avctx->bits_per_coded_sample);
176 return AVERROR_INVALIDDATA;
177 }
178
179 if (avctx->pix_fmt == AV_PIX_FMT_RGB32) {
180 c->planemap[0] = HAVE_BIGENDIAN ? 1 : 2; // 1st plane is red
181 c->planemap[1] = HAVE_BIGENDIAN ? 2 : 1; // 2nd plane is green
182 c->planemap[2] = HAVE_BIGENDIAN ? 3 : 0; // 3rd plane is blue
183 c->planemap[3] = HAVE_BIGENDIAN ? 0 : 3; // 4th plane is alpha???
184 }
185 return 0;
186 }
187
188 AVCodec ff_eightbps_decoder = {
189 .name = "8bps",
190 .long_name = NULL_IF_CONFIG_SMALL("QuickTime 8BPS video"),
191 .type = AVMEDIA_TYPE_VIDEO,
192 .id = AV_CODEC_ID_8BPS,
193 .priv_data_size = sizeof(EightBpsContext),
194 .init = decode_init,
195 .decode = decode_frame,
196 .capabilities = CODEC_CAP_DR1,
197 };