19671d767f8d95245b18eb7927553b4ed30a4c3d
[libav.git] / libavcodec / iff.c
1 /*
2 * IFF PBM/ILBM bitmap decoder
3 * Copyright (c) 2010 Peter Ross <pross@xvid.org>
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg 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 * FFmpeg 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 FFmpeg; 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 libavcodec/iff.c
24 * IFF PBM/ILBM bitmap decoder
25 */
26
27 #include "bytestream.h"
28 #include "avcodec.h"
29 #include "get_bits.h"
30 #include "iff.h"
31
32 typedef struct {
33 AVFrame frame;
34 int planesize;
35 uint8_t * planebuf;
36 } IffContext;
37
38 /**
39 * Convert CMAP buffer (stored in extradata) to lavc palette format
40 */
41 int ff_cmap_read_palette(AVCodecContext *avctx, uint32_t *pal)
42 {
43 int count, i;
44
45 if (avctx->bits_per_coded_sample > 8) {
46 av_log(avctx, AV_LOG_ERROR, "bit_per_coded_sample > 8 not supported\n");
47 return AVERROR_INVALIDDATA;
48 }
49
50 count = 1 << avctx->bits_per_coded_sample;
51 if (avctx->extradata_size < count * 3) {
52 av_log(avctx, AV_LOG_ERROR, "palette data underflow\n");
53 return AVERROR_INVALIDDATA;
54 }
55 for (i=0; i < count; i++) {
56 pal[i] = 0xFF000000 | AV_RB24( avctx->extradata + i*3 );
57 }
58 return 0;
59 }
60
61 static av_cold int decode_init(AVCodecContext *avctx)
62 {
63 IffContext *s = avctx->priv_data;
64 int err;
65
66 if (avctx->bits_per_coded_sample <= 8) {
67 avctx->pix_fmt = PIX_FMT_PAL8;
68 } else if (avctx->bits_per_coded_sample <= 32) {
69 avctx->pix_fmt = PIX_FMT_BGR32;
70 } else {
71 return AVERROR_INVALIDDATA;
72 }
73
74 s->planesize = avctx->width / 8;
75 s->planebuf = av_malloc(s->planesize + FF_INPUT_BUFFER_PADDING_SIZE);
76 if (!s->planebuf)
77 return AVERROR(ENOMEM);
78
79 s->frame.reference = 1;
80 if ((err = avctx->get_buffer(avctx, &s->frame) < 0)) {
81 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
82 return err;
83 }
84
85 return avctx->bits_per_coded_sample <= 8 ?
86 ff_cmap_read_palette(avctx, (uint32_t*)s->frame.data[1]) : 0;
87 }
88
89 /**
90 * Decode interleaved plane buffer
91 * @param dst Destination buffer
92 * @param buf Source buffer
93 * @param buf_size
94 * @param bps bits_per_coded_sample
95 * @param plane plane number to decode as
96 */
97 #define DECLARE_DECODEPLANE(suffix, type) \
98 static void decodeplane##suffix(void *dst, const uint8_t *const buf, int buf_size, int bps, int plane) \
99 { \
100 GetBitContext gb; \
101 int i, b; \
102 init_get_bits(&gb, buf, buf_size * 8); \
103 for(i = 0; i < (buf_size * 8 + bps - 1) / bps; i++) { \
104 for (b = 0; b < bps; b++) { \
105 ((type *)dst)[ i*bps + b ] |= get_bits1(&gb) << plane; \
106 } \
107 } \
108 }
109 DECLARE_DECODEPLANE(8, uint8_t)
110 DECLARE_DECODEPLANE(32, uint32_t)
111
112 static int decode_frame_ilbm(AVCodecContext *avctx,
113 void *data, int *data_size,
114 AVPacket *avpkt)
115 {
116 IffContext *s = avctx->priv_data;
117 const uint8_t *buf = avpkt->data;
118 int buf_size = avpkt->size;
119 const uint8_t *buf_end = buf+buf_size;
120 int y, plane;
121
122 if (avctx->reget_buffer(avctx, &s->frame) < 0){
123 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
124 return -1;
125 }
126
127 for(y = 0; y < avctx->height; y++ ) {
128 uint8_t *row = &s->frame.data[0][ y*s->frame.linesize[0] ];
129 memset(row, 0, avctx->pix_fmt == PIX_FMT_PAL8 ? avctx->width : (avctx->width * 4));
130 for (plane = 0; plane < avctx->bits_per_coded_sample && buf < buf_end; plane++) {
131 if (avctx->pix_fmt == PIX_FMT_PAL8) {
132 decodeplane8(row, buf, FFMIN(s->planesize, buf_end - buf), avctx->bits_per_coded_sample, plane);
133 } else { // PIX_FMT_BGR32
134 decodeplane32(row, buf, FFMIN(s->planesize, buf_end - buf), avctx->bits_per_coded_sample, plane);
135 }
136 buf += s->planesize;
137 }
138 }
139
140 *data_size = sizeof(AVFrame);
141 *(AVFrame*)data = s->frame;
142 return buf_size;
143 }
144
145 static int decode_frame_byterun1(AVCodecContext *avctx,
146 void *data, int *data_size,
147 AVPacket *avpkt)
148 {
149 IffContext *s = avctx->priv_data;
150 const uint8_t *buf = avpkt->data;
151 int buf_size = avpkt->size;
152 const uint8_t *buf_end = buf+buf_size;
153 int y, plane, x;
154
155 if (avctx->reget_buffer(avctx, &s->frame) < 0){
156 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
157 return -1;
158 }
159
160 for(y = 0; y < avctx->height ; y++ ) {
161 uint8_t *row = &s->frame.data[0][ y*s->frame.linesize[0] ];
162 if (avctx->codec_tag == MKTAG('I','L','B','M')) { //interleaved
163 memset(row, 0, avctx->pix_fmt == PIX_FMT_PAL8 ? avctx->width : (avctx->width * 4));
164 for (plane = 0; plane < avctx->bits_per_coded_sample; plane++) {
165 for(x = 0; x < s->planesize && buf < buf_end; ) {
166 int8_t value = *buf++;
167 int length;
168 if (value >= 0) {
169 length = value + 1;
170 memcpy(s->planebuf + x, buf, FFMIN3(length, s->planesize - x, buf_end - buf));
171 buf += length;
172 } else if (value > -128) {
173 length = -value + 1;
174 memset(s->planebuf + x, *buf++, FFMIN(length, s->planesize - x));
175 } else { //noop
176 continue;
177 }
178 x += length;
179 }
180 if (avctx->pix_fmt == PIX_FMT_PAL8) {
181 decodeplane8(row, s->planebuf, s->planesize, avctx->bits_per_coded_sample, plane);
182 } else { //PIX_FMT_BGR32
183 decodeplane32(row, s->planebuf, s->planesize, avctx->bits_per_coded_sample, plane);
184 }
185 }
186 } else {
187 for(x = 0; x < avctx->width && buf < buf_end; ) {
188 int8_t value = *buf++;
189 int length;
190 if (value >= 0) {
191 length = value + 1;
192 memcpy(row + x, buf, FFMIN3(length, buf_end - buf, avctx->width - x));
193 buf += length;
194 } else if (value > -128) {
195 length = -value + 1;
196 memset(row + x, *buf++, FFMIN(length, avctx->width - x));
197 } else { //noop
198 continue;
199 }
200 x += length;
201 }
202 }
203 }
204
205 *data_size = sizeof(AVFrame);
206 *(AVFrame*)data = s->frame;
207 return buf_size;
208 }
209
210 static av_cold int decode_end(AVCodecContext *avctx)
211 {
212 IffContext *s = avctx->priv_data;
213 if (s->frame.data[0])
214 avctx->release_buffer(avctx, &s->frame);
215 av_freep(&s->planebuf);
216 return 0;
217 }
218
219 AVCodec iff_ilbm_decoder = {
220 "iff_ilbm",
221 CODEC_TYPE_VIDEO,
222 CODEC_ID_IFF_ILBM,
223 sizeof(IffContext),
224 decode_init,
225 NULL,
226 decode_end,
227 decode_frame_ilbm,
228 CODEC_CAP_DR1,
229 .long_name = NULL_IF_CONFIG_SMALL("IFF ILBM"),
230 };
231
232 AVCodec iff_byterun1_decoder = {
233 "iff_byterun1",
234 CODEC_TYPE_VIDEO,
235 CODEC_ID_IFF_BYTERUN1,
236 sizeof(IffContext),
237 decode_init,
238 NULL,
239 decode_end,
240 decode_frame_byterun1,
241 CODEC_CAP_DR1,
242 .long_name = NULL_IF_CONFIG_SMALL("IFF ByteRun1"),
243 };