Switch some ints to unsigned (they can only have positive values, this allows
[libav.git] / libavcodec / iff.c
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1/*
2 * IFF PBM/ILBM bitmap decoder
3 * Copyright (c) 2010 Peter Ross <pross@xvid.org>
473147be 4 * Copyright (c) 2010 Sebastian Vater <cdgs.basty@googlemail.com>
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5 *
6 * This file is part of FFmpeg.
7 *
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23/**
ba87f080 24 * @file
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25 * IFF PBM/ILBM bitmap decoder
26 */
27
28#include "bytestream.h"
29#include "avcodec.h"
005caa34 30#include "get_bits.h"
d9747e29 31#include "iff.h"
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32
33typedef struct {
34 AVFrame frame;
473147be 35 unsigned planesize;
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36 uint8_t * planebuf;
37} IffContext;
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38
39/**
40 * Convert CMAP buffer (stored in extradata) to lavc palette format
41 */
42int ff_cmap_read_palette(AVCodecContext *avctx, uint32_t *pal)
43{
473147be 44 unsigned count, i;
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45
46 if (avctx->bits_per_coded_sample > 8) {
47 av_log(avctx, AV_LOG_ERROR, "bit_per_coded_sample > 8 not supported\n");
48 return AVERROR_INVALIDDATA;
49 }
50
51 count = 1 << avctx->bits_per_coded_sample;
52 if (avctx->extradata_size < count * 3) {
53 av_log(avctx, AV_LOG_ERROR, "palette data underflow\n");
54 return AVERROR_INVALIDDATA;
55 }
56 for (i=0; i < count; i++) {
005caa34 57 pal[i] = 0xFF000000 | AV_RB24( avctx->extradata + i*3 );
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58 }
59 return 0;
60}
61
62static av_cold int decode_init(AVCodecContext *avctx)
63{
005caa34 64 IffContext *s = avctx->priv_data;
0edfa79b 65 int err;
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66
67 if (avctx->bits_per_coded_sample <= 8) {
68 avctx->pix_fmt = PIX_FMT_PAL8;
69 } else if (avctx->bits_per_coded_sample <= 32) {
70 avctx->pix_fmt = PIX_FMT_BGR32;
71 } else {
72 return AVERROR_INVALIDDATA;
73 }
b9e06ddd 74
473147be 75 s->planesize = avctx->width >> 3;
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76 s->planebuf = av_malloc(s->planesize + FF_INPUT_BUFFER_PADDING_SIZE);
77 if (!s->planebuf)
78 return AVERROR(ENOMEM);
b9e06ddd 79
005caa34 80 s->frame.reference = 1;
0edfa79b 81 if ((err = avctx->get_buffer(avctx, &s->frame) < 0)) {
b9e06ddd 82 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
0edfa79b 83 return err;
b9e06ddd 84 }
b9e06ddd 85
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86 return avctx->bits_per_coded_sample <= 8 ?
87 ff_cmap_read_palette(avctx, (uint32_t*)s->frame.data[1]) : 0;
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88}
89
90/**
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91 * Decode interleaved plane buffer up to 8bpp
92 * @param dst Destination buffer
93 * @param buf Source buffer
94 * @param buf_size
95 * @param bps bits_per_coded_sample (must be <= 8)
96 * @param plane plane number to decode as
97 */
98static void decodeplane8(uint8_t *dst, const uint8_t *const buf, int buf_size, int bps, int plane)
99{
100 GetBitContext gb;
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101 unsigned int i;
102 const unsigned b = (buf_size * 8) + bps - 1;
687dc355 103 init_get_bits(&gb, buf, buf_size * 8);
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104 for(i = 0; i < b; i++) {
105 dst[i] |= get_bits1(&gb) << plane;
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106 }
107}
108
109/**
110 * Decode interleaved plane buffer up to 24bpp
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111 * @param dst Destination buffer
112 * @param buf Source buffer
113 * @param buf_size
114 * @param bps bits_per_coded_sample
115 * @param plane plane number to decode as
b9e06ddd 116 */
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117static void decodeplane32(uint32_t *dst, const uint8_t *const buf, int buf_size, int bps, int plane)
118{
119 GetBitContext gb;
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120 unsigned i;
121 const unsigned b = (buf_size * 8) + bps - 1;
687dc355 122 init_get_bits(&gb, buf, buf_size * 8);
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123 for(i = 0; i < b; i++) {
124 dst[i] |= get_bits1(&gb) << plane;
687dc355 125 }
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126}
127
128static int decode_frame_ilbm(AVCodecContext *avctx,
129 void *data, int *data_size,
130 AVPacket *avpkt)
131{
005caa34 132 IffContext *s = avctx->priv_data;
b9e06ddd 133 const uint8_t *buf = avpkt->data;
473147be 134 unsigned buf_size = avpkt->size;
cbba8fec 135 const uint8_t *buf_end = buf+buf_size;
473147be 136 unsigned y, plane;
b9e06ddd 137
005caa34 138 if (avctx->reget_buffer(avctx, &s->frame) < 0){
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139 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
140 return -1;
141 }
142
b9e06ddd 143 for(y = 0; y < avctx->height; y++ ) {
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144 uint8_t *row = &s->frame.data[0][ y*s->frame.linesize[0] ];
145 memset(row, 0, avctx->pix_fmt == PIX_FMT_PAL8 ? avctx->width : (avctx->width * 4));
cbba8fec 146 for (plane = 0; plane < avctx->bits_per_coded_sample && buf < buf_end; plane++) {
005caa34 147 if (avctx->pix_fmt == PIX_FMT_PAL8) {
cbba8fec 148 decodeplane8(row, buf, FFMIN(s->planesize, buf_end - buf), avctx->bits_per_coded_sample, plane);
005caa34 149 } else { // PIX_FMT_BGR32
473147be 150 decodeplane32((uint32_t *) row, buf, FFMIN(s->planesize, buf_end - buf), avctx->bits_per_coded_sample, plane);
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151 }
152 buf += s->planesize;
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153 }
154 }
155
156 *data_size = sizeof(AVFrame);
005caa34 157 *(AVFrame*)data = s->frame;
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158 return buf_size;
159}
160
161static int decode_frame_byterun1(AVCodecContext *avctx,
162 void *data, int *data_size,
163 AVPacket *avpkt)
164{
005caa34 165 IffContext *s = avctx->priv_data;
b9e06ddd 166 const uint8_t *buf = avpkt->data;
473147be 167 unsigned buf_size = avpkt->size;
b9e06ddd 168 const uint8_t *buf_end = buf+buf_size;
473147be 169 unsigned y, plane, x;
b9e06ddd 170
005caa34 171 if (avctx->reget_buffer(avctx, &s->frame) < 0){
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172 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
173 return -1;
174 }
175
176 for(y = 0; y < avctx->height ; y++ ) {
005caa34 177 uint8_t *row = &s->frame.data[0][ y*s->frame.linesize[0] ];
b9e06ddd 178 if (avctx->codec_tag == MKTAG('I','L','B','M')) { //interleaved
005caa34 179 memset(row, 0, avctx->pix_fmt == PIX_FMT_PAL8 ? avctx->width : (avctx->width * 4));
b9e06ddd 180 for (plane = 0; plane < avctx->bits_per_coded_sample; plane++) {
005caa34 181 for(x = 0; x < s->planesize && buf < buf_end; ) {
9f1d760a 182 int8_t value = *buf++;
473147be 183 unsigned length;
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184 if (value >= 0) {
185 length = value + 1;
005caa34 186 memcpy(s->planebuf + x, buf, FFMIN3(length, s->planesize - x, buf_end - buf));
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187 buf += length;
188 } else if (value > -128) {
189 length = -value + 1;
005caa34 190 memset(s->planebuf + x, *buf++, FFMIN(length, s->planesize - x));
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191 } else { //noop
192 continue;
193 }
194 x += length;
195 }
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196 if (avctx->pix_fmt == PIX_FMT_PAL8) {
197 decodeplane8(row, s->planebuf, s->planesize, avctx->bits_per_coded_sample, plane);
198 } else { //PIX_FMT_BGR32
473147be 199 decodeplane32((uint32_t *) row, s->planebuf, s->planesize, avctx->bits_per_coded_sample, plane);
005caa34 200 }
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201 }
202 } else {
203 for(x = 0; x < avctx->width && buf < buf_end; ) {
9f1d760a 204 int8_t value = *buf++;
473147be 205 unsigned length;
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206 if (value >= 0) {
207 length = value + 1;
208 memcpy(row + x, buf, FFMIN3(length, buf_end - buf, avctx->width - x));
209 buf += length;
210 } else if (value > -128) {
211 length = -value + 1;
212 memset(row + x, *buf++, FFMIN(length, avctx->width - x));
213 } else { //noop
214 continue;
215 }
216 x += length;
217 }
218 }
219 }
220
221 *data_size = sizeof(AVFrame);
005caa34 222 *(AVFrame*)data = s->frame;
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223 return buf_size;
224}
225
226static av_cold int decode_end(AVCodecContext *avctx)
227{
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228 IffContext *s = avctx->priv_data;
229 if (s->frame.data[0])
230 avctx->release_buffer(avctx, &s->frame);
231 av_freep(&s->planebuf);
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232 return 0;
233}
234
235AVCodec iff_ilbm_decoder = {
236 "iff_ilbm",
72415b2a 237 AVMEDIA_TYPE_VIDEO,
b9e06ddd 238 CODEC_ID_IFF_ILBM,
005caa34 239 sizeof(IffContext),
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240 decode_init,
241 NULL,
242 decode_end,
243 decode_frame_ilbm,
244 CODEC_CAP_DR1,
245 .long_name = NULL_IF_CONFIG_SMALL("IFF ILBM"),
246};
247
248AVCodec iff_byterun1_decoder = {
249 "iff_byterun1",
72415b2a 250 AVMEDIA_TYPE_VIDEO,
b9e06ddd 251 CODEC_ID_IFF_BYTERUN1,
005caa34 252 sizeof(IffContext),
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253 decode_init,
254 NULL,
255 decode_end,
256 decode_frame_byterun1,
257 CODEC_CAP_DR1,
258 .long_name = NULL_IF_CONFIG_SMALL("IFF ByteRun1"),
259};