b5ee2e6e477bae62832242bd2386c97ed3e9d72b
[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 for(y = 0; y < avctx->height; y++ ) {
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));
146 for (plane = 0; plane < avctx->bits_per_coded_sample && buf < buf_end; plane++) {
147 if (avctx->pix_fmt == PIX_FMT_PAL8) {
148 decodeplane8(row, buf, FFMIN(s->planesize, buf_end - buf), avctx->bits_per_coded_sample, plane);
149 } else { // PIX_FMT_BGR32
150 decodeplane32((uint32_t *) row, buf, FFMIN(s->planesize, buf_end - buf), avctx->bits_per_coded_sample, plane);
151 }
152 buf += s->planesize;
153 }
154 }
155
156 *data_size = sizeof(AVFrame);
157 *(AVFrame*)data = s->frame;
158 return buf_size;
159 }
160
161 static int decode_frame_byterun1(AVCodecContext *avctx,
162 void *data, int *data_size,
163 AVPacket *avpkt)
164 {
165 IffContext *s = avctx->priv_data;
166 const uint8_t *buf = avpkt->data;
167 unsigned buf_size = avpkt->size;
168 const uint8_t *buf_end = buf+buf_size;
169 unsigned y, plane, x;
170
171 if (avctx->reget_buffer(avctx, &s->frame) < 0){
172 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
173 return -1;
174 }
175
176 for(y = 0; y < avctx->height ; y++ ) {
177 uint8_t *row = &s->frame.data[0][ y*s->frame.linesize[0] ];
178 if (avctx->codec_tag == MKTAG('I','L','B','M')) { //interleaved
179 memset(row, 0, avctx->pix_fmt == PIX_FMT_PAL8 ? avctx->width : (avctx->width * 4));
180 for (plane = 0; plane < avctx->bits_per_coded_sample; plane++) {
181 for(x = 0; x < s->planesize && buf < buf_end; ) {
182 int8_t value = *buf++;
183 unsigned length;
184 if (value >= 0) {
185 length = value + 1;
186 memcpy(s->planebuf + x, buf, FFMIN3(length, s->planesize - x, buf_end - buf));
187 buf += length;
188 } else if (value > -128) {
189 length = -value + 1;
190 memset(s->planebuf + x, *buf++, FFMIN(length, s->planesize - x));
191 } else { //noop
192 continue;
193 }
194 x += length;
195 }
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
199 decodeplane32((uint32_t *) row, s->planebuf, s->planesize, avctx->bits_per_coded_sample, plane);
200 }
201 }
202 } else {
203 for(x = 0; x < avctx->width && buf < buf_end; ) {
204 int8_t value = *buf++;
205 unsigned length;
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);
222 *(AVFrame*)data = s->frame;
223 return buf_size;
224 }
225
226 static av_cold int decode_end(AVCodecContext *avctx)
227 {
228 IffContext *s = avctx->priv_data;
229 if (s->frame.data[0])
230 avctx->release_buffer(avctx, &s->frame);
231 av_freep(&s->planebuf);
232 return 0;
233 }
234
235 AVCodec iff_ilbm_decoder = {
236 "iff_ilbm",
237 AVMEDIA_TYPE_VIDEO,
238 CODEC_ID_IFF_ILBM,
239 sizeof(IffContext),
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
248 AVCodec iff_byterun1_decoder = {
249 "iff_byterun1",
250 AVMEDIA_TYPE_VIDEO,
251 CODEC_ID_IFF_BYTERUN1,
252 sizeof(IffContext),
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 };