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