2 * Bitmap Brothers JV video decoder
3 * Copyright (c) 2011 Peter Ross <pross@xvid.org>
5 * This file is part of Libav.
7 * Libav 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 * Libav 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 Libav; 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);
52 static inline void decode2x2(GetBitContext *gb, uint8_t *dst, int linesize)
56 switch (get_bits(gb, 2)) {
58 v[0] = get_bits(gb, 8);
59 for (j = 0; j < 2; j++)
60 memset(dst + j*linesize, v[0], 2);
63 v[0] = get_bits(gb, 8);
64 v[1] = get_bits(gb, 8);
65 for (j = 0; j < 2; j++)
66 for (i = 0; i < 2; i++)
67 dst[j*linesize + i] = v[get_bits1(gb)];
70 for (j = 0; j < 2; j++)
71 for (i = 0; i < 2; i++)
72 dst[j*linesize + i] = get_bits(gb, 8);
79 static inline void decode4x4(GetBitContext *gb, uint8_t *dst, int linesize)
83 switch (get_bits(gb, 2)) {
85 v[0] = get_bits(gb, 8);
86 for (j = 0; j < 4; j++)
87 memset(dst + j*linesize, v[0], 4);
90 v[0] = get_bits(gb, 8);
91 v[1] = get_bits(gb, 8);
92 for (j = 2; j >= 0; j -= 2) {
93 for (i = 0; i < 4; i++)
94 dst[j*linesize + i] = v[get_bits1(gb)];
95 for (i = 0; i < 4; i++)
96 dst[(j+1)*linesize + i] = v[get_bits1(gb)];
100 for (j = 0; j < 4; j += 2)
101 for (i = 0; i < 4; i += 2)
102 decode2x2(gb, dst + j*linesize + i, linesize);
109 static inline void decode8x8(GetBitContext *gb, uint8_t *dst, int linesize, DSPContext *dsp)
113 switch (get_bits(gb, 2)) {
115 v[0] = get_bits(gb, 8);
116 dsp->fill_block_tab[1](dst, v[0], linesize, 8);
119 v[0] = get_bits(gb, 8);
120 v[1] = get_bits(gb, 8);
121 for (j = 7; j >= 0; j--)
122 for (i = 0; i < 8; i++)
123 dst[j*linesize + i] = v[get_bits1(gb)];
126 for (j = 0; j < 8; j += 4)
127 for (i = 0; i < 8; i += 4)
128 decode4x4(gb, dst + j*linesize + i, linesize);
132 static int decode_frame(AVCodecContext *avctx,
133 void *data, int *got_frame,
136 JvContext *s = avctx->priv_data;
137 int buf_size = avpkt->size;
138 const uint8_t *buf = avpkt->data;
139 const uint8_t *buf_end = buf + buf_size;
140 int video_size, video_type, i, j, ret;
142 video_size = AV_RL32(buf);
147 if ((ret = ff_reget_buffer(avctx, &s->frame)) < 0) {
148 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
152 if (video_type == 0 || video_type == 1) {
154 init_get_bits(&gb, buf, 8 * FFMIN(video_size, buf_end - buf));
156 for (j = 0; j < avctx->height; j += 8)
157 for (i = 0; i < avctx->width; i += 8)
158 decode8x8(&gb, s->frame.data[0] + j*s->frame.linesize[0] + i,
159 s->frame.linesize[0], &s->dsp);
162 } else if (video_type == 2) {
163 if (buf + 1 <= buf_end) {
165 for (j = 0; j < avctx->height; j++)
166 memset(s->frame.data[0] + j*s->frame.linesize[0], v, avctx->width);
169 av_log(avctx, AV_LOG_WARNING, "unsupported frame type %i\n", video_type);
170 return AVERROR_INVALIDDATA;
175 for (i = 0; i < AVPALETTE_COUNT && buf + 3 <= buf_end; i++) {
176 s->palette[i] = AV_RB24(buf) << 2;
179 s->palette_has_changed = 1;
183 s->frame.key_frame = 1;
184 s->frame.pict_type = AV_PICTURE_TYPE_I;
185 s->frame.palette_has_changed = s->palette_has_changed;
186 s->palette_has_changed = 0;
187 memcpy(s->frame.data[1], s->palette, AVPALETTE_SIZE);
189 if ((ret = av_frame_ref(data, &s->frame)) < 0)
197 static av_cold int decode_close(AVCodecContext *avctx)
199 JvContext *s = avctx->priv_data;
201 av_frame_unref(&s->frame);
206 AVCodec ff_jv_decoder = {
208 .long_name = NULL_IF_CONFIG_SMALL("Bitmap Brothers JV video"),
209 .type = AVMEDIA_TYPE_VIDEO,
210 .id = AV_CODEC_ID_JV,
211 .priv_data_size = sizeof(JvContext),
213 .close = decode_close,
214 .decode = decode_frame,
215 .capabilities = CODEC_CAP_DR1,