2 * Bitmap Brothers JV video decoder
3 * Copyright (c) 2011 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
24 * Bitmap Brothers JV video decoder
25 * @author Peter Ross <pross@xvid.org>
32 #include "libavutil/intreadwrite.h"
34 typedef struct JvContext {
37 uint32_t palette[AVPALETTE_COUNT];
38 int palette_has_changed;
41 static av_cold int decode_init(AVCodecContext *avctx)
43 JvContext *s = avctx->priv_data;
44 avctx->pix_fmt = AV_PIX_FMT_PAL8;
45 ff_dsputil_init(&s->dsp, avctx);
46 avcodec_get_frame_defaults(&s->frame);
53 static inline void decode2x2(GetBitContext *gb, uint8_t *dst, int linesize)
57 switch (get_bits(gb, 2)) {
59 v[0] = get_bits(gb, 8);
60 for (j = 0; j < 2; j++)
61 memset(dst + j*linesize, v[0], 2);
64 v[0] = get_bits(gb, 8);
65 v[1] = get_bits(gb, 8);
66 for (j = 0; j < 2; j++)
67 for (i = 0; i < 2; i++)
68 dst[j*linesize + i] = v[get_bits1(gb)];
71 for (j = 0; j < 2; j++)
72 for (i = 0; i < 2; i++)
73 dst[j*linesize + i] = get_bits(gb, 8);
80 static inline void decode4x4(GetBitContext *gb, uint8_t *dst, int linesize)
84 switch (get_bits(gb, 2)) {
86 v[0] = get_bits(gb, 8);
87 for (j = 0; j < 4; j++)
88 memset(dst + j*linesize, v[0], 4);
91 v[0] = get_bits(gb, 8);
92 v[1] = get_bits(gb, 8);
93 for (j = 2; j >= 0; j -= 2) {
94 for (i = 0; i < 4; i++)
95 dst[j*linesize + i] = v[get_bits1(gb)];
96 for (i = 0; i < 4; i++)
97 dst[(j+1)*linesize + i] = v[get_bits1(gb)];
101 for (j = 0; j < 4; j += 2)
102 for (i = 0; i < 4; i += 2)
103 decode2x2(gb, dst + j*linesize + i, linesize);
110 static inline void decode8x8(GetBitContext *gb, uint8_t *dst, int linesize, DSPContext *dsp)
114 switch (get_bits(gb, 2)) {
116 v[0] = get_bits(gb, 8);
117 dsp->fill_block_tab[1](dst, v[0], linesize, 8);
120 v[0] = get_bits(gb, 8);
121 v[1] = get_bits(gb, 8);
122 for (j = 7; j >= 0; j--)
123 for (i = 0; i < 8; i++)
124 dst[j*linesize + i] = v[get_bits1(gb)];
127 for (j = 0; j < 8; j += 4)
128 for (i = 0; i < 8; i += 4)
129 decode4x4(gb, dst + j*linesize + i, linesize);
133 static int decode_frame(AVCodecContext *avctx,
134 void *data, int *got_frame,
137 JvContext *s = avctx->priv_data;
138 const uint8_t *buf = avpkt->data;
139 const uint8_t *buf_end = buf + avpkt->size;
140 int video_size, video_type, i, j, ret;
143 return AVERROR_INVALIDDATA;
145 video_size = AV_RL32(buf);
150 if (video_size < 0 || video_size > avpkt->size - 5) {
151 av_log(avctx, AV_LOG_ERROR, "video size %d invalid\n", video_size);
152 return AVERROR_INVALIDDATA;
154 if ((ret = ff_reget_buffer(avctx, &s->frame)) < 0)
157 if (video_type == 0 || video_type == 1) {
159 init_get_bits(&gb, buf, 8 * video_size);
161 for (j = 0; j < avctx->height; j += 8)
162 for (i = 0; i < avctx->width; i += 8)
163 decode8x8(&gb, s->frame.data[0] + j*s->frame.linesize[0] + i,
164 s->frame.linesize[0], &s->dsp);
167 } else if (video_type == 2) {
169 for (j = 0; j < avctx->height; j++)
170 memset(s->frame.data[0] + j*s->frame.linesize[0], v, avctx->width);
172 av_log(avctx, AV_LOG_WARNING, "unsupported frame type %i\n", video_type);
173 return AVERROR_INVALIDDATA;
177 if (buf_end - buf >= AVPALETTE_COUNT * 3) {
178 for (i = 0; i < AVPALETTE_COUNT; i++) {
179 uint32_t pal = AV_RB24(buf);
180 s->palette[i] = 0xFFU << 24 | pal << 2 | ((pal >> 4) & 0x30303);
183 s->palette_has_changed = 1;
187 s->frame.key_frame = 1;
188 s->frame.pict_type = AV_PICTURE_TYPE_I;
189 s->frame.palette_has_changed = s->palette_has_changed;
190 s->palette_has_changed = 0;
191 memcpy(s->frame.data[1], s->palette, AVPALETTE_SIZE);
193 if ((ret = av_frame_ref(data, &s->frame)) < 0)
201 static av_cold int decode_close(AVCodecContext *avctx)
203 JvContext *s = avctx->priv_data;
205 av_frame_unref(&s->frame);
210 AVCodec ff_jv_decoder = {
212 .long_name = NULL_IF_CONFIG_SMALL("Bitmap Brothers JV video"),
213 .type = AVMEDIA_TYPE_VIDEO,
214 .id = AV_CODEC_ID_JV,
215 .priv_data_size = sizeof(JvContext),
217 .close = decode_close,
218 .decode = decode_frame,
219 .capabilities = CODEC_CAP_DR1,