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;
45 s->frame = av_frame_alloc();
47 return AVERROR(ENOMEM);
49 avctx->pix_fmt = AV_PIX_FMT_PAL8;
50 ff_dsputil_init(&s->dsp, avctx);
57 static inline void decode2x2(GetBitContext *gb, uint8_t *dst, int linesize)
61 switch (get_bits(gb, 2)) {
63 v[0] = get_bits(gb, 8);
64 for (j = 0; j < 2; j++)
65 memset(dst + j*linesize, v[0], 2);
68 v[0] = get_bits(gb, 8);
69 v[1] = get_bits(gb, 8);
70 for (j = 0; j < 2; j++)
71 for (i = 0; i < 2; i++)
72 dst[j*linesize + i] = v[get_bits1(gb)];
75 for (j = 0; j < 2; j++)
76 for (i = 0; i < 2; i++)
77 dst[j*linesize + i] = get_bits(gb, 8);
84 static inline void decode4x4(GetBitContext *gb, uint8_t *dst, int linesize)
88 switch (get_bits(gb, 2)) {
90 v[0] = get_bits(gb, 8);
91 for (j = 0; j < 4; j++)
92 memset(dst + j*linesize, v[0], 4);
95 v[0] = get_bits(gb, 8);
96 v[1] = get_bits(gb, 8);
97 for (j = 2; j >= 0; j -= 2) {
98 for (i = 0; i < 4; i++)
99 dst[j*linesize + i] = v[get_bits1(gb)];
100 for (i = 0; i < 4; i++)
101 dst[(j+1)*linesize + i] = v[get_bits1(gb)];
105 for (j = 0; j < 4; j += 2)
106 for (i = 0; i < 4; i += 2)
107 decode2x2(gb, dst + j*linesize + i, linesize);
114 static inline void decode8x8(GetBitContext *gb, uint8_t *dst, int linesize, DSPContext *dsp)
118 switch (get_bits(gb, 2)) {
120 v[0] = get_bits(gb, 8);
121 dsp->fill_block_tab[1](dst, v[0], linesize, 8);
124 v[0] = get_bits(gb, 8);
125 v[1] = get_bits(gb, 8);
126 for (j = 7; j >= 0; j--)
127 for (i = 0; i < 8; i++)
128 dst[j*linesize + i] = v[get_bits1(gb)];
131 for (j = 0; j < 8; j += 4)
132 for (i = 0; i < 8; i += 4)
133 decode4x4(gb, dst + j*linesize + i, linesize);
137 static int decode_frame(AVCodecContext *avctx,
138 void *data, int *got_frame,
141 JvContext *s = avctx->priv_data;
142 int buf_size = avpkt->size;
143 const uint8_t *buf = avpkt->data;
144 const uint8_t *buf_end = buf + buf_size;
145 int video_size, video_type, i, j, ret;
147 video_size = AV_RL32(buf);
152 if ((ret = ff_reget_buffer(avctx, s->frame)) < 0) {
153 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
157 if (video_type == 0 || video_type == 1) {
159 init_get_bits(&gb, buf, 8 * FFMIN(video_size, buf_end - buf));
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) {
168 if (buf + 1 <= buf_end) {
170 for (j = 0; j < avctx->height; j++)
171 memset(s->frame->data[0] + j*s->frame->linesize[0], v, avctx->width);
174 av_log(avctx, AV_LOG_WARNING, "unsupported frame type %i\n", video_type);
175 return AVERROR_INVALIDDATA;
180 for (i = 0; i < AVPALETTE_COUNT && buf + 3 <= buf_end; i++) {
181 s->palette[i] = AV_RB24(buf) << 2;
184 s->palette_has_changed = 1;
188 s->frame->key_frame = 1;
189 s->frame->pict_type = AV_PICTURE_TYPE_I;
190 s->frame->palette_has_changed = s->palette_has_changed;
191 s->palette_has_changed = 0;
192 memcpy(s->frame->data[1], s->palette, AVPALETTE_SIZE);
194 if ((ret = av_frame_ref(data, s->frame)) < 0)
202 static av_cold int decode_close(AVCodecContext *avctx)
204 JvContext *s = avctx->priv_data;
206 av_frame_free(&s->frame);
211 AVCodec ff_jv_decoder = {
213 .long_name = NULL_IF_CONFIG_SMALL("Bitmap Brothers JV video"),
214 .type = AVMEDIA_TYPE_VIDEO,
215 .id = AV_CODEC_ID_JV,
216 .priv_data_size = sizeof(JvContext),
218 .close = decode_close,
219 .decode = decode_frame,
220 .capabilities = CODEC_CAP_DR1,