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"
39 * Convert CMAP buffer (stored in extradata) to lavc palette format
41 int ff_cmap_read_palette(AVCodecContext *avctx, uint32_t *pal)
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;
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;
55 for (i=0; i < count; i++) {
56 pal[i] = 0xFF000000 | AV_RB24( avctx->extradata + i*3 );
61 static av_cold int decode_init(AVCodecContext *avctx)
63 IffContext *s = avctx->priv_data;
65 if (avctx->bits_per_coded_sample <= 8) {
66 avctx->pix_fmt = PIX_FMT_PAL8;
67 } else if (avctx->bits_per_coded_sample <= 32) {
68 avctx->pix_fmt = PIX_FMT_BGR32;
70 return AVERROR_INVALIDDATA;
73 s->planesize = avctx->width / 8;
74 s->planebuf = av_malloc(s->planesize + FF_INPUT_BUFFER_PADDING_SIZE);
76 return AVERROR(ENOMEM);
78 s->frame.reference = 1;
79 if (avctx->get_buffer(avctx, &s->frame) < 0) {
80 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
81 return AVERROR_UNKNOWN;
84 return avctx->bits_per_coded_sample <= 8 ?
85 ff_cmap_read_palette(avctx, (uint32_t*)s->frame.data[1]) : 0;
89 * Decode interleaved plane buffer
90 * @param dst Destination buffer
91 * @param buf Source buffer
93 * @param bps bits_per_coded_sample
94 * @param plane plane number to decode as
96 #define DECLARE_DECODEPLANE(suffix, type) \
97 static void decodeplane##suffix(void *dst, const uint8_t *const buf, int buf_size, int bps, int plane) \
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 ((type *)dst)[ i*bps + b ] |= get_bits1(&gb) << plane; \
108 DECLARE_DECODEPLANE(8, uint8_t)
109 DECLARE_DECODEPLANE(32, uint32_t)
111 static int decode_frame_ilbm(AVCodecContext *avctx,
112 void *data, int *data_size,
115 IffContext *s = avctx->priv_data;
116 const uint8_t *buf = avpkt->data;
117 int buf_size = avpkt->size;
118 const uint8_t *buf_end = buf+buf_size;
121 if (avctx->reget_buffer(avctx, &s->frame) < 0){
122 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
126 for(y = 0; y < avctx->height; y++ ) {
127 uint8_t *row = &s->frame.data[0][ y*s->frame.linesize[0] ];
128 memset(row, 0, avctx->pix_fmt == PIX_FMT_PAL8 ? avctx->width : (avctx->width * 4));
129 for (plane = 0; plane < avctx->bits_per_coded_sample && buf < buf_end; plane++) {
130 if (avctx->pix_fmt == PIX_FMT_PAL8) {
131 decodeplane8(row, buf, FFMIN(s->planesize, buf_end - buf), avctx->bits_per_coded_sample, plane);
132 } else { // PIX_FMT_BGR32
133 decodeplane32(row, buf, FFMIN(s->planesize, buf_end - buf), avctx->bits_per_coded_sample, plane);
139 *data_size = sizeof(AVFrame);
140 *(AVFrame*)data = s->frame;
144 static int decode_frame_byterun1(AVCodecContext *avctx,
145 void *data, int *data_size,
148 IffContext *s = avctx->priv_data;
149 const uint8_t *buf = avpkt->data;
150 int buf_size = avpkt->size;
151 const uint8_t *buf_end = buf+buf_size;
154 if (avctx->reget_buffer(avctx, &s->frame) < 0){
155 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
159 for(y = 0; y < avctx->height ; y++ ) {
160 uint8_t *row = &s->frame.data[0][ y*s->frame.linesize[0] ];
161 if (avctx->codec_tag == MKTAG('I','L','B','M')) { //interleaved
162 memset(row, 0, avctx->pix_fmt == PIX_FMT_PAL8 ? avctx->width : (avctx->width * 4));
163 for (plane = 0; plane < avctx->bits_per_coded_sample; plane++) {
164 for(x = 0; x < s->planesize && buf < buf_end; ) {
165 int8_t value = *buf++;
169 memcpy(s->planebuf + x, buf, FFMIN3(length, s->planesize - x, buf_end - buf));
171 } else if (value > -128) {
173 memset(s->planebuf + x, *buf++, FFMIN(length, s->planesize - x));
179 if (avctx->pix_fmt == PIX_FMT_PAL8) {
180 decodeplane8(row, s->planebuf, s->planesize, avctx->bits_per_coded_sample, plane);
181 } else { //PIX_FMT_BGR32
182 decodeplane32(row, s->planebuf, s->planesize, avctx->bits_per_coded_sample, plane);
186 for(x = 0; x < avctx->width && buf < buf_end; ) {
187 int8_t value = *buf++;
191 memcpy(row + x, buf, FFMIN3(length, buf_end - buf, avctx->width - x));
193 } else if (value > -128) {
195 memset(row + x, *buf++, FFMIN(length, avctx->width - x));
204 *data_size = sizeof(AVFrame);
205 *(AVFrame*)data = s->frame;
209 static av_cold int decode_end(AVCodecContext *avctx)
211 IffContext *s = avctx->priv_data;
212 if (s->frame.data[0])
213 avctx->release_buffer(avctx, &s->frame);
214 av_freep(&s->planebuf);
218 AVCodec iff_ilbm_decoder = {
228 .long_name = NULL_IF_CONFIG_SMALL("IFF ILBM"),
231 AVCodec iff_byterun1_decoder = {
234 CODEC_ID_IFF_BYTERUN1,
239 decode_frame_byterun1,
241 .long_name = NULL_IF_CONFIG_SMALL("IFF ByteRun1"),