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
33typedef struct {
34    AVFrame frame;
35    int planesize;
36    uint8_t * planebuf;
37} IffContext;
38
39/**
40 * Convert CMAP buffer (stored in extradata) to lavc palette format
41 */
42int ff_cmap_read_palette(AVCodecContext *avctx, uint32_t *pal)
43{
44    int 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
62static 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 */
98static void decodeplane8(uint8_t *dst, const uint8_t *const buf, int buf_size, int bps, int plane)
99{
100    GetBitContext gb;
101    int i;
102    const int 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 */
117static void decodeplane32(uint32_t *dst, const uint8_t *const buf, int buf_size, int bps, int plane)
118{
119    GetBitContext gb;
120    int i;
121    const int 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
128static 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    int buf_size = avpkt->size;
135    const uint8_t *buf_end = buf+buf_size;
136    int 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    if (avctx->pix_fmt == PIX_FMT_PAL8) {
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->width);
147            for (plane = 0; plane < avctx->bits_per_coded_sample && buf < buf_end; plane++) {
148                decodeplane8(row, buf, FFMIN(s->planesize, buf_end - buf), avctx->bits_per_coded_sample, plane);
149                buf += s->planesize;
150            }
151        }
152    } else { // PIX_FMT_BGR32
153        for(y = 0; y < avctx->height; y++ ) {
154            uint8_t *row = &s->frame.data[0][y*s->frame.linesize[0]];
155            memset(row, 0, avctx->width << 2);
156            for (plane = 0; plane < avctx->bits_per_coded_sample && buf < buf_end; plane++) {
157                decodeplane32((uint32_t *) row, buf, FFMIN(s->planesize, buf_end - buf), avctx->bits_per_coded_sample, plane);
158                buf += s->planesize;
159            }
160        }
161    }
162
163    *data_size = sizeof(AVFrame);
164    *(AVFrame*)data = s->frame;
165    return buf_size;
166}
167
168static int decode_frame_byterun1(AVCodecContext *avctx,
169                            void *data, int *data_size,
170                            AVPacket *avpkt)
171{
172    IffContext *s = avctx->priv_data;
173    const uint8_t *buf = avpkt->data;
174    int buf_size = avpkt->size;
175    const uint8_t *buf_end = buf+buf_size;
176    int y, plane, x;
177
178    if (avctx->reget_buffer(avctx, &s->frame) < 0){
179        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
180        return -1;
181    }
182
183    if (avctx->codec_tag == MKTAG('I','L','B','M')) { //interleaved
184        if (avctx->pix_fmt == PIX_FMT_PAL8) {
185            for(y = 0; y < avctx->height ; y++ ) {
186                uint8_t *row = &s->frame.data[0][ y*s->frame.linesize[0] ];
187                memset(row, 0, avctx->width);
188                for (plane = 0; plane < avctx->bits_per_coded_sample; plane++) {
189                    for(x = 0; x < s->planesize && buf < buf_end; ) {
190                        int8_t value = *buf++;
191                        unsigned length;
192                        if (value >= 0) {
193                            length = value + 1;
194                            memcpy(s->planebuf + x, buf, FFMIN3(length, s->planesize - x, buf_end - buf));
195                            buf += length;
196                        } else if (value > -128) {
197                            length = -value + 1;
198                            memset(s->planebuf + x, *buf++, FFMIN(length, s->planesize - x));
199                        } else { //noop
200                            continue;
201                        }
202                        x += length;
203                    }
204                    decodeplane8(row, s->planebuf, s->planesize, avctx->bits_per_coded_sample, plane);
205                }
206            }
207        } else { //PIX_FMT_BGR32
208            for(y = 0; y < avctx->height ; y++ ) {
209                uint8_t *row = &s->frame.data[0][y*s->frame.linesize[0]];
210                memset(row, 0, avctx->width << 2);
211                for (plane = 0; plane < avctx->bits_per_coded_sample; plane++) {
212                    for(x = 0; x < s->planesize && buf < buf_end; ) {
213                        int8_t value = *buf++;
214                        unsigned length;
215                        if (value >= 0) {
216                            length = value + 1;
217                            memcpy(s->planebuf + x, buf, FFMIN3(length, s->planesize - x, buf_end - buf));
218                            buf += length;
219                        } else if (value > -128) {
220                            length = -value + 1;
221                            memset(s->planebuf + x, *buf++, FFMIN(length, s->planesize - x));
222                        } else { // noop
223                            continue;
224                        }
225                        x += length;
226                    }
227                    decodeplane32((uint32_t *) row, s->planebuf, s->planesize, avctx->bits_per_coded_sample, plane);
228                }
229            }
230        }
231    } else {
232        for(y = 0; y < avctx->height ; y++ ) {
233            uint8_t *row = &s->frame.data[0][y*s->frame.linesize[0]];
234            for(x = 0; x < avctx->width && buf < buf_end; ) {
235                int8_t value = *buf++;
236                unsigned length;
237                if (value >= 0) {
238                    length = value + 1;
239                    memcpy(row + x, buf, FFMIN3(length, buf_end - buf, avctx->width - x));
240                    buf += length;
241                } else if (value > -128) {
242                    length = -value + 1;
243                    memset(row + x, *buf++, FFMIN(length, avctx->width - x));
244                } else { //noop
245                    continue;
246                }
247                x += length;
248            }
249        }
250    }
251
252    *data_size = sizeof(AVFrame);
253    *(AVFrame*)data = s->frame;
254    return buf_size;
255}
256
257static av_cold int decode_end(AVCodecContext *avctx)
258{
259    IffContext *s = avctx->priv_data;
260    if (s->frame.data[0])
261        avctx->release_buffer(avctx, &s->frame);
262    av_freep(&s->planebuf);
263    return 0;
264}
265
266AVCodec iff_ilbm_decoder = {
267    "iff_ilbm",
268    AVMEDIA_TYPE_VIDEO,
269    CODEC_ID_IFF_ILBM,
270    sizeof(IffContext),
271    decode_init,
272    NULL,
273    decode_end,
274    decode_frame_ilbm,
275    CODEC_CAP_DR1,
276    .long_name = NULL_IF_CONFIG_SMALL("IFF ILBM"),
277};
278
279AVCodec iff_byterun1_decoder = {
280    "iff_byterun1",
281    AVMEDIA_TYPE_VIDEO,
282    CODEC_ID_IFF_BYTERUN1,
283    sizeof(IffContext),
284    decode_init,
285    NULL,
286    decode_end,
287    decode_frame_byterun1,
288    CODEC_CAP_DR1,
289    .long_name = NULL_IF_CONFIG_SMALL("IFF ByteRun1"),
290};
291