2 * IFF PBM/ILBM bitmap decoder
3 * Copyright (c) 2010 Peter Ross <pross@xvid.org>
5 * This file is part of FFmpeg.
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.
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.
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
23 * @file libavcodec/iff.c
24 * IFF PBM/ILBM bitmap decoder
27 #include "bytestream.h"
38 * Convert CMAP buffer (stored in extradata) to lavc palette format
40 int ff_cmap_read_palette(AVCodecContext *avctx, uint32_t *pal)
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;
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;
54 for (i=0; i < count; i++) {
55 pal[i] = 0xFF000000 | AV_RB24( avctx->extradata + i*3 );
60 static av_cold int decode_init(AVCodecContext *avctx)
62 IffContext *s = avctx->priv_data;
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;
69 return AVERROR_INVALIDDATA;
72 s->planesize = avctx->width / 8;
73 s->planebuf = av_malloc(s->planesize + FF_INPUT_BUFFER_PADDING_SIZE);
75 return AVERROR(ENOMEM);
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;
83 return avctx->bits_per_coded_sample <= 8 ?
84 ff_cmap_read_palette(avctx, (uint32_t*)s->frame.data[1]) : 0;
88 * Decode interleaved plane buffer
89 * @param dst Destination buffer
90 * @param buf Source buffer
92 * @param bps bits_per_coded_sample
93 * @param plane plane number to decode as
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) \
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; \
107 DECLARE_DECODEPLANE(8, uint8_t)
108 DECLARE_DECODEPLANE(32, uint32_t)
110 static int decode_frame_ilbm(AVCodecContext *avctx,
111 void *data, int *data_size,
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;
120 if (avctx->reget_buffer(avctx, &s->frame) < 0){
121 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
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);
138 *data_size = sizeof(AVFrame);
139 *(AVFrame*)data = s->frame;
143 static int decode_frame_byterun1(AVCodecContext *avctx,
144 void *data, int *data_size,
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;
153 if (avctx->reget_buffer(avctx, &s->frame) < 0){
154 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
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++;
168 memcpy(s->planebuf + x, buf, FFMIN3(length, s->planesize - x, buf_end - buf));
170 } else if (value > -128) {
172 memset(s->planebuf + x, *buf++, FFMIN(length, s->planesize - x));
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);
185 for(x = 0; x < avctx->width && buf < buf_end; ) {
186 int8_t value = *buf++;
190 memcpy(row + x, buf, FFMIN3(length, buf_end - buf, avctx->width - x));
192 } else if (value > -128) {
194 memset(row + x, *buf++, FFMIN(length, avctx->width - x));
203 *data_size = sizeof(AVFrame);
204 *(AVFrame*)data = s->frame;
208 static av_cold int decode_end(AVCodecContext *avctx)
210 IffContext *s = avctx->priv_data;
211 if (s->frame.data[0])
212 avctx->release_buffer(avctx, &s->frame);
213 av_freep(&s->planebuf);
217 AVCodec iff_ilbm_decoder = {
227 .long_name = NULL_IF_CONFIG_SMALL("IFF ILBM"),
230 AVCodec iff_byterun1_decoder = {
233 CODEC_ID_IFF_BYTERUN1,
238 decode_frame_byterun1,
240 .long_name = NULL_IF_CONFIG_SMALL("IFF ByteRun1"),