Reidnent after r22795.
[libav.git] / libavcodec / iff.c
1 /*
2 * IFF PBM/ILBM bitmap decoder
3 * Copyright (c) 2010 Peter Ross <pross@xvid.org>
4 * Copyright (c) 2010 Sebastian Vater <cdgs.basty@googlemail.com>
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 /**
24 * @file
25 * IFF PBM/ILBM bitmap decoder
26 */
27
28 #include "bytestream.h"
29 #include "avcodec.h"
30 #include "get_bits.h"
31 #include "iff.h"
32
33 typedef struct {
34 AVFrame frame;
35 unsigned planesize;
36 uint8_t * planebuf;
37 } IffContext;
38
39 /**
40 * Convert CMAP buffer (stored in extradata) to lavc palette format
41 */
42 int ff_cmap_read_palette(AVCodecContext *avctx, uint32_t *pal)
43 {
44 unsigned count, i;
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++) {
57 pal[i] = 0xFF000000 | AV_RB24( avctx->extradata + i*3 );
58 }
59 return 0;
60 }
61
62 static av_cold int decode_init(AVCodecContext *avctx)
63 {
64 IffContext *s = avctx->priv_data;
65 int err;
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 }
74
75 s->planesize = avctx->width >> 3;
76 s->planebuf = av_malloc(s->planesize + FF_INPUT_BUFFER_PADDING_SIZE);
77 if (!s->planebuf)
78 return AVERROR(ENOMEM);
79
80 s->frame.reference = 1;
81 if ((err = avctx->get_buffer(avctx, &s->frame) < 0)) {
82 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
83 return err;
84 }
85
86 return avctx->bits_per_coded_sample <= 8 ?
87 ff_cmap_read_palette(avctx, (uint32_t*)s->frame.data[1]) : 0;
88 }
89
90 /**
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 */
98 static void decodeplane8(uint8_t *dst, const uint8_t *const buf, int buf_size, int bps, int plane)
99 {
100 GetBitContext gb;
101 unsigned int i;
102 const unsigned b = (buf_size * 8) + bps - 1;
103 init_get_bits(&gb, buf, buf_size * 8);
104 for(i = 0; i < b; i++) {
105 dst[i] |= get_bits1(&gb) << plane;
106 }
107 }
108
109 /**
110 * Decode interleaved plane buffer up to 24bpp
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
116 */
117 static void decodeplane32(uint32_t *dst, const uint8_t *const buf, int buf_size, int bps, int plane)
118 {
119 GetBitContext gb;
120 unsigned i;
121 const unsigned b = (buf_size * 8) + bps - 1;
122 init_get_bits(&gb, buf, buf_size * 8);
123 for(i = 0; i < b; i++) {
124 dst[i] |= get_bits1(&gb) << plane;
125 }
126 }
127
128 static int decode_frame_ilbm(AVCodecContext *avctx,
129 void *data, int *data_size,
130 AVPacket *avpkt)
131 {
132 IffContext *s = avctx->priv_data;
133 const uint8_t *buf = avpkt->data;
134 unsigned buf_size = avpkt->size;
135 const uint8_t *buf_end = buf+buf_size;
136 unsigned y, plane;
137
138 if (avctx->reget_buffer(avctx, &s->frame) < 0){
139 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
140 return -1;
141 }
142
143 if (avctx->pix_fmt == PIX_FMT_PAL8) {
144 for(y = 0; y < avctx->height; y++ ) {
145 uint8_t *row = &s->frame.data[0][ y*s->frame.linesize[0] ];
146 memset(row, 0, avctx->width);
147 for (plane = 0; plane < avctx->bits_per_coded_sample && buf < buf_end; plane++) {
148 decodeplane8(row, buf, FFMIN(s->planesize, buf_end - buf), avctx->bits_per_coded_sample, plane);
149 buf += s->planesize;
150 }
151 }
152 } else { // PIX_FMT_BGR32
153 for(y = 0; y < avctx->height; y++ ) {
154 uint8_t *row = &s->frame.data[0][y*s->frame.linesize[0]];
155 memset(row, 0, avctx->width << 2);
156 for (plane = 0; plane < avctx->bits_per_coded_sample && buf < buf_end; plane++) {
157 decodeplane32((uint32_t *) row, buf, FFMIN(s->planesize, buf_end - buf), avctx->bits_per_coded_sample, plane);
158 buf += s->planesize;
159 }
160 }
161 }
162
163 *data_size = sizeof(AVFrame);
164 *(AVFrame*)data = s->frame;
165 return buf_size;
166 }
167
168 static int decode_frame_byterun1(AVCodecContext *avctx,
169 void *data, int *data_size,
170 AVPacket *avpkt)
171 {
172 IffContext *s = avctx->priv_data;
173 const uint8_t *buf = avpkt->data;
174 unsigned buf_size = avpkt->size;
175 const uint8_t *buf_end = buf+buf_size;
176 unsigned y, plane, x;
177
178 if (avctx->reget_buffer(avctx, &s->frame) < 0){
179 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
180 return -1;
181 }
182
183 if (avctx->codec_tag == MKTAG('I','L','B','M')) { //interleaved
184 if (avctx->pix_fmt == PIX_FMT_PAL8) {
185 for(y = 0; y < avctx->height ; y++ ) {
186 uint8_t *row = &s->frame.data[0][ y*s->frame.linesize[0] ];
187 memset(row, 0, avctx->width);
188 for (plane = 0; plane < avctx->bits_per_coded_sample; plane++) {
189 for(x = 0; x < s->planesize && buf < buf_end; ) {
190 int8_t value = *buf++;
191 unsigned length;
192 if (value >= 0) {
193 length = value + 1;
194 memcpy(s->planebuf + x, buf, FFMIN3(length, s->planesize - x, buf_end - buf));
195 buf += length;
196 } else if (value > -128) {
197 length = -value + 1;
198 memset(s->planebuf + x, *buf++, FFMIN(length, s->planesize - x));
199 } else { //noop
200 continue;
201 }
202 x += length;
203 }
204 decodeplane8(row, s->planebuf, s->planesize, avctx->bits_per_coded_sample, plane);
205 }
206 }
207 } else { //PIX_FMT_BGR32
208 for(y = 0; y < avctx->height ; y++ ) {
209 uint8_t *row = &s->frame.data[0][y*s->frame.linesize[0]];
210 memset(row, 0, avctx->width << 2);
211 for (plane = 0; plane < avctx->bits_per_coded_sample; plane++) {
212 for(x = 0; x < s->planesize && buf < buf_end; ) {
213 int8_t value = *buf++;
214 unsigned length;
215 if (value >= 0) {
216 length = value + 1;
217 memcpy(s->planebuf + x, buf, FFMIN3(length, s->planesize - x, buf_end - buf));
218 buf += length;
219 } else if (value > -128) {
220 length = -value + 1;
221 memset(s->planebuf + x, *buf++, FFMIN(length, s->planesize - x));
222 } else { // noop
223 continue;
224 }
225 x += length;
226 }
227 decodeplane32((uint32_t *) row, s->planebuf, s->planesize, avctx->bits_per_coded_sample, plane);
228 }
229 }
230 }
231 } else {
232 for(y = 0; y < avctx->height ; y++ ) {
233 uint8_t *row = &s->frame.data[0][y*s->frame.linesize[0]];
234 for(x = 0; x < avctx->width && buf < buf_end; ) {
235 int8_t value = *buf++;
236 unsigned length;
237 if (value >= 0) {
238 length = value + 1;
239 memcpy(row + x, buf, FFMIN3(length, buf_end - buf, avctx->width - x));
240 buf += length;
241 } else if (value > -128) {
242 length = -value + 1;
243 memset(row + x, *buf++, FFMIN(length, avctx->width - x));
244 } else { //noop
245 continue;
246 }
247 x += length;
248 }
249 }
250 }
251
252 *data_size = sizeof(AVFrame);
253 *(AVFrame*)data = s->frame;
254 return buf_size;
255 }
256
257 static av_cold int decode_end(AVCodecContext *avctx)
258 {
259 IffContext *s = avctx->priv_data;
260 if (s->frame.data[0])
261 avctx->release_buffer(avctx, &s->frame);
262 av_freep(&s->planebuf);
263 return 0;
264 }
265
266 AVCodec iff_ilbm_decoder = {
267 "iff_ilbm",
268 AVMEDIA_TYPE_VIDEO,
269 CODEC_ID_IFF_ILBM,
270 sizeof(IffContext),
271 decode_init,
272 NULL,
273 decode_end,
274 decode_frame_ilbm,
275 CODEC_CAP_DR1,
276 .long_name = NULL_IF_CONFIG_SMALL("IFF ILBM"),
277 };
278
279 AVCodec iff_byterun1_decoder = {
280 "iff_byterun1",
281 AVMEDIA_TYPE_VIDEO,
282 CODEC_ID_IFF_BYTERUN1,
283 sizeof(IffContext),
284 decode_init,
285 NULL,
286 decode_end,
287 decode_frame_byterun1,
288 CODEC_CAP_DR1,
289 .long_name = NULL_IF_CONFIG_SMALL("IFF ByteRun1"),
290 };