Make two functions out of #define hackery.
[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
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 up to 8bpp
91 * @param dst Destination buffer
92 * @param buf Source buffer
93 * @param buf_size
94 * @param bps bits_per_coded_sample (must be <= 8)
95 * @param plane plane number to decode as
96 */
97 static void decodeplane8(uint8_t *dst, const uint8_t *const buf, int buf_size, int bps, int plane)
98 {
99 GetBitContext gb;
100 int i, b;
101 init_get_bits(&gb, buf, buf_size * 8);
102 for(i = 0; i < (buf_size * 8 + bps - 1) / bps; i++) {
103 for (b = 0; b < bps; b++) {
104 dst[ i*bps + b ] |= get_bits1(&gb) << plane;
105 }
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 int i, b;
121 init_get_bits(&gb, buf, buf_size * 8);
122 for(i = 0; i < (buf_size * 8 + bps - 1) / bps; i++) {
123 for (b = 0; b < bps; b++) {
124 dst[ i*bps + b ] |= get_bits1(&gb) << plane;
125 }
126 }
127 }
128
129 static int decode_frame_ilbm(AVCodecContext *avctx,
130 void *data, int *data_size,
131 AVPacket *avpkt)
132 {
133 IffContext *s = avctx->priv_data;
134 const uint8_t *buf = avpkt->data;
135 int buf_size = avpkt->size;
136 const uint8_t *buf_end = buf+buf_size;
137 int y, plane;
138
139 if (avctx->reget_buffer(avctx, &s->frame) < 0){
140 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
141 return -1;
142 }
143
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->pix_fmt == PIX_FMT_PAL8 ? avctx->width : (avctx->width * 4));
147 for (plane = 0; plane < avctx->bits_per_coded_sample && buf < buf_end; plane++) {
148 if (avctx->pix_fmt == PIX_FMT_PAL8) {
149 decodeplane8(row, buf, FFMIN(s->planesize, buf_end - buf), avctx->bits_per_coded_sample, plane);
150 } else { // PIX_FMT_BGR32
151 decodeplane32(row, buf, FFMIN(s->planesize, buf_end - buf), avctx->bits_per_coded_sample, plane);
152 }
153 buf += s->planesize;
154 }
155 }
156
157 *data_size = sizeof(AVFrame);
158 *(AVFrame*)data = s->frame;
159 return buf_size;
160 }
161
162 static int decode_frame_byterun1(AVCodecContext *avctx,
163 void *data, int *data_size,
164 AVPacket *avpkt)
165 {
166 IffContext *s = avctx->priv_data;
167 const uint8_t *buf = avpkt->data;
168 int buf_size = avpkt->size;
169 const uint8_t *buf_end = buf+buf_size;
170 int y, plane, x;
171
172 if (avctx->reget_buffer(avctx, &s->frame) < 0){
173 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
174 return -1;
175 }
176
177 for(y = 0; y < avctx->height ; y++ ) {
178 uint8_t *row = &s->frame.data[0][ y*s->frame.linesize[0] ];
179 if (avctx->codec_tag == MKTAG('I','L','B','M')) { //interleaved
180 memset(row, 0, avctx->pix_fmt == PIX_FMT_PAL8 ? avctx->width : (avctx->width * 4));
181 for (plane = 0; plane < avctx->bits_per_coded_sample; plane++) {
182 for(x = 0; x < s->planesize && buf < buf_end; ) {
183 int8_t value = *buf++;
184 int length;
185 if (value >= 0) {
186 length = value + 1;
187 memcpy(s->planebuf + x, buf, FFMIN3(length, s->planesize - x, buf_end - buf));
188 buf += length;
189 } else if (value > -128) {
190 length = -value + 1;
191 memset(s->planebuf + x, *buf++, FFMIN(length, s->planesize - x));
192 } else { //noop
193 continue;
194 }
195 x += length;
196 }
197 if (avctx->pix_fmt == PIX_FMT_PAL8) {
198 decodeplane8(row, s->planebuf, s->planesize, avctx->bits_per_coded_sample, plane);
199 } else { //PIX_FMT_BGR32
200 decodeplane32(row, s->planebuf, s->planesize, avctx->bits_per_coded_sample, plane);
201 }
202 }
203 } else {
204 for(x = 0; x < avctx->width && buf < buf_end; ) {
205 int8_t value = *buf++;
206 int length;
207 if (value >= 0) {
208 length = value + 1;
209 memcpy(row + x, buf, FFMIN3(length, buf_end - buf, avctx->width - x));
210 buf += length;
211 } else if (value > -128) {
212 length = -value + 1;
213 memset(row + x, *buf++, FFMIN(length, avctx->width - x));
214 } else { //noop
215 continue;
216 }
217 x += length;
218 }
219 }
220 }
221
222 *data_size = sizeof(AVFrame);
223 *(AVFrame*)data = s->frame;
224 return buf_size;
225 }
226
227 static av_cold int decode_end(AVCodecContext *avctx)
228 {
229 IffContext *s = avctx->priv_data;
230 if (s->frame.data[0])
231 avctx->release_buffer(avctx, &s->frame);
232 av_freep(&s->planebuf);
233 return 0;
234 }
235
236 AVCodec iff_ilbm_decoder = {
237 "iff_ilbm",
238 AVMEDIA_TYPE_VIDEO,
239 CODEC_ID_IFF_ILBM,
240 sizeof(IffContext),
241 decode_init,
242 NULL,
243 decode_end,
244 decode_frame_ilbm,
245 CODEC_CAP_DR1,
246 .long_name = NULL_IF_CONFIG_SMALL("IFF ILBM"),
247 };
248
249 AVCodec iff_byterun1_decoder = {
250 "iff_byterun1",
251 AVMEDIA_TYPE_VIDEO,
252 CODEC_ID_IFF_BYTERUN1,
253 sizeof(IffContext),
254 decode_init,
255 NULL,
256 decode_end,
257 decode_frame_byterun1,
258 CODEC_CAP_DR1,
259 .long_name = NULL_IF_CONFIG_SMALL("IFF ByteRun1"),
260 };