lavc decoders: work with refcounted frames.
[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;
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 /* Set data pointer after line lengths */
80 dp = encoded + planes * (height << 1);
81
82 /* Ignore alpha plane, don't know what to do with it */
83 if (planes == 4)
84 planes--;
85
86 px_inc = planes + (avctx->pix_fmt == AV_PIX_FMT_RGB32);
87
88 for (p = 0; p < planes; p++) {
89 /* Lines length pointer for this plane */
90 lp = encoded + p * (height << 1);
91
92 /* Decode a plane */
93 for (row = 0; row < height; row++) {
94 pixptr = frame->data[0] + row * frame->linesize[0] + planemap[p];
95 pixptr_end = pixptr + frame->linesize[0];
96 dlen = av_be2ne16(*(const unsigned short *)(lp + row * 2));
97 /* Decode a row of this plane */
98 while (dlen > 0) {
99 if (dp + 1 >= buf + buf_size)
100 return AVERROR_INVALIDDATA;
101 if ((count = *dp++) <= 127) {
102 count++;
103 dlen -= count + 1;
104 if (pixptr + count * px_inc > pixptr_end)
105 break;
106 if (dp + count > buf + buf_size)
107 return AVERROR_INVALIDDATA;
108 while (count--) {
109 *pixptr = *dp++;
110 pixptr += px_inc;
111 }
112 } else {
113 count = 257 - count;
114 if (pixptr + count * px_inc > pixptr_end)
115 break;
116 while (count--) {
117 *pixptr = *dp;
118 pixptr += px_inc;
119 }
120 dp++;
121 dlen -= 2;
122 }
123 }
124 }
125 }
126
127 if (avctx->bits_per_coded_sample <= 8) {
128 const uint8_t *pal = av_packet_get_side_data(avpkt,
129 AV_PKT_DATA_PALETTE,
130 NULL);
131 if (pal) {
132 frame->palette_has_changed = 1;
133 memcpy(c->pal, pal, AVPALETTE_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
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 = avctx->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 #if HAVE_BIGENDIAN
168 c->planemap[0] = 1; // 1st plane is red
169 c->planemap[1] = 2; // 2nd plane is green
170 c->planemap[2] = 3; // 3rd plane is blue
171 c->planemap[3] = 0; // 4th plane is alpha???
172 #else
173 c->planemap[0] = 2; // 1st plane is red
174 c->planemap[1] = 1; // 2nd plane is green
175 c->planemap[2] = 0; // 3rd plane is blue
176 c->planemap[3] = 3; // 4th plane is alpha???
177 #endif
178 break;
179 default:
180 av_log(avctx, AV_LOG_ERROR, "Error: Unsupported color depth: %u.\n",
181 avctx->bits_per_coded_sample);
182 return AVERROR_INVALIDDATA;
183 }
184
185 return 0;
186 }
187
188 AVCodec ff_eightbps_decoder = {
189 .name = "8bps",
190 .type = AVMEDIA_TYPE_VIDEO,
191 .id = AV_CODEC_ID_8BPS,
192 .priv_data_size = sizeof(EightBpsContext),
193 .init = decode_init,
194 .decode = decode_frame,
195 .capabilities = CODEC_CAP_DR1,
196 .long_name = NULL_IF_CONFIG_SMALL("QuickTime 8BPS video"),
197 };