10l ;; gcc 2.95 compilation fix by mike
[libav.git] / libavcodec / iff.c
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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
30/**
31 * Convert CMAP buffer (stored in extradata) to lavc palette format
32 */
33int ff_cmap_read_palette(AVCodecContext *avctx, uint32_t *pal)
34{
35 int count, i;
36
37 if (avctx->bits_per_coded_sample > 8) {
38 av_log(avctx, AV_LOG_ERROR, "bit_per_coded_sample > 8 not supported\n");
39 return AVERROR_INVALIDDATA;
40 }
41
42 count = 1 << avctx->bits_per_coded_sample;
43 if (avctx->extradata_size < count * 3) {
44 av_log(avctx, AV_LOG_ERROR, "palette data underflow\n");
45 return AVERROR_INVALIDDATA;
46 }
47 for (i=0; i < count; i++) {
48 pal[i] = AV_RB24( avctx->extradata + i*3 );
49 }
50 return 0;
51}
52
53static av_cold int decode_init(AVCodecContext *avctx)
54{
55 AVFrame *frame = avctx->priv_data;
56
57 avctx->pix_fmt = PIX_FMT_PAL8;
58 frame->reference = 1;
59
60 if (avctx->get_buffer(avctx, frame) < 0) {
61 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
62 return AVERROR_UNKNOWN;
63 }
64 return ff_cmap_read_palette(avctx, (uint32_t*)frame->data[1]);
65}
66
67/**
68 * Interleaved memcpy
69 */
70static void imemcpy(uint8_t *dst, const uint8_t const *buf, int x, int bps, int plane, int length)
71{
72 int i, b;
73 for(i = 0; i < length; i++) {
74 int value = buf[i];
75 for (b = 0; b < bps; b++) {
76 if (value & (1<<b))
77 dst[ (x+i)*bps + 7 - b] |= 1<<plane;
78 }
79 }
80}
81
82/**
83 * Interleaved memset
84 */
85static void imemset(uint8_t *dst, int value, int x, int bps, int plane, int length)
86{
87 int i, b;
88 for(i = 0; i < length; i++) {
89 for (b = 0; b < bps; b++) {
90 if (value & (1<<b))
91 dst[ (x+i)*bps + 7 - b] |= 1<<plane;
92 }
93 }
94}
95
96static int decode_frame_ilbm(AVCodecContext *avctx,
97 void *data, int *data_size,
98 AVPacket *avpkt)
99{
100 AVFrame *frame = avctx->priv_data;
101 const uint8_t *buf = avpkt->data;
102 int buf_size = avpkt->size;
103 int planewidth = avctx->width / avctx->bits_per_coded_sample;
104 int y, plane;
105
106 if (avctx->reget_buffer(avctx, frame) < 0){
107 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
108 return -1;
109 }
110
111 if (buf_size < avctx->width * avctx->height) {
112 av_log(avctx, AV_LOG_ERROR, "buffer underflow\n");
113 return -1;
114 }
115
116 for(y = 0; y < avctx->height; y++ ) {
117 uint8_t *row = &frame->data[0][ y*frame->linesize[0] ];
118 memset(row, 0, avctx->width);
119 for (plane = 0; plane < avctx->bits_per_coded_sample; plane++) {
120 imemcpy(row, buf, 0, avctx->bits_per_coded_sample, plane, planewidth);
121 buf += planewidth;
122 }
123 }
124
125 *data_size = sizeof(AVFrame);
126 *(AVFrame*)data = *frame;
127 return buf_size;
128}
129
130static int decode_frame_byterun1(AVCodecContext *avctx,
131 void *data, int *data_size,
132 AVPacket *avpkt)
133{
134 AVFrame *frame = avctx->priv_data;
135 const uint8_t *buf = avpkt->data;
136 int buf_size = avpkt->size;
137 const uint8_t *buf_end = buf+buf_size;
138 int planewidth = avctx->width / avctx->bits_per_coded_sample;
139 int y, plane, x;
140
141 if (avctx->reget_buffer(avctx, frame) < 0){
142 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
143 return -1;
144 }
145
146 for(y = 0; y < avctx->height ; y++ ) {
147 uint8_t *row = &frame->data[0][ y*frame->linesize[0] ];
148 if (avctx->codec_tag == MKTAG('I','L','B','M')) { //interleaved
149 memset(row, 0, avctx->width);
150 for (plane = 0; plane < avctx->bits_per_coded_sample; plane++) {
151 for(x = 0; x < planewidth && buf < buf_end; ) {
9f1d760a 152 int8_t value = *buf++;
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153 int length;
154 if (value >= 0) {
155 length = value + 1;
156 imemcpy(row, buf, x, avctx->bits_per_coded_sample, plane, FFMIN3(length, buf_end - buf, planewidth - x));
157 buf += length;
158 } else if (value > -128) {
159 length = -value + 1;
160 imemset(row, *buf++, x, avctx->bits_per_coded_sample, plane, FFMIN(length, planewidth - x));
161 } else { //noop
162 continue;
163 }
164 x += length;
165 }
166 }
167 } else {
168 for(x = 0; x < avctx->width && buf < buf_end; ) {
9f1d760a 169 int8_t value = *buf++;
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170 int length;
171 if (value >= 0) {
172 length = value + 1;
173 memcpy(row + x, buf, FFMIN3(length, buf_end - buf, avctx->width - x));
174 buf += length;
175 } else if (value > -128) {
176 length = -value + 1;
177 memset(row + x, *buf++, FFMIN(length, avctx->width - x));
178 } else { //noop
179 continue;
180 }
181 x += length;
182 }
183 }
184 }
185
186 *data_size = sizeof(AVFrame);
187 *(AVFrame*)data = *frame;
188 return buf_size;
189}
190
191static av_cold int decode_end(AVCodecContext *avctx)
192{
193 AVFrame *frame = avctx->priv_data;
194 if (frame->data[0])
195 avctx->release_buffer(avctx, frame);
196 return 0;
197}
198
199AVCodec iff_ilbm_decoder = {
200 "iff_ilbm",
201 CODEC_TYPE_VIDEO,
202 CODEC_ID_IFF_ILBM,
203 sizeof(AVFrame),
204 decode_init,
205 NULL,
206 decode_end,
207 decode_frame_ilbm,
208 CODEC_CAP_DR1,
209 .long_name = NULL_IF_CONFIG_SMALL("IFF ILBM"),
210};
211
212AVCodec iff_byterun1_decoder = {
213 "iff_byterun1",
214 CODEC_TYPE_VIDEO,
215 CODEC_ID_IFF_BYTERUN1,
216 sizeof(AVFrame),
217 decode_init,
218 NULL,
219 decode_end,
220 decode_frame_byterun1,
221 CODEC_CAP_DR1,
222 .long_name = NULL_IF_CONFIG_SMALL("IFF ByteRun1"),
223};