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>
28 #include "libavutil/intreadwrite.h"
35 typedef struct JvContext {
38 uint32_t palette[AVPALETTE_COUNT];
39 int palette_has_changed;
42 static av_cold int decode_init(AVCodecContext *avctx)
44 JvContext *s = avctx->priv_data;
46 s->frame = av_frame_alloc();
48 return AVERROR(ENOMEM);
50 avctx->pix_fmt = AV_PIX_FMT_PAL8;
51 ff_dsputil_init(&s->dsp, avctx);
58 static inline void decode2x2(GetBitContext *gb, uint8_t *dst, int linesize)
62 switch (get_bits(gb, 2)) {
64 v[0] = get_bits(gb, 8);
65 for (j = 0; j < 2; j++)
66 memset(dst + j * linesize, v[0], 2);
69 v[0] = get_bits(gb, 8);
70 v[1] = get_bits(gb, 8);
71 for (j = 0; j < 2; j++)
72 for (i = 0; i < 2; i++)
73 dst[j * linesize + i] = v[get_bits1(gb)];
76 for (j = 0; j < 2; j++)
77 for (i = 0; i < 2; i++)
78 dst[j * linesize + i] = get_bits(gb, 8);
85 static inline void decode4x4(GetBitContext *gb, uint8_t *dst, int linesize)
89 switch (get_bits(gb, 2)) {
91 v[0] = get_bits(gb, 8);
92 for (j = 0; j < 4; j++)
93 memset(dst + j * linesize, v[0], 4);
96 v[0] = get_bits(gb, 8);
97 v[1] = get_bits(gb, 8);
98 for (j = 2; j >= 0; j -= 2) {
99 for (i = 0; i < 4; i++)
100 dst[j * linesize + i] = v[get_bits1(gb)];
101 for (i = 0; i < 4; i++)
102 dst[(j + 1) * linesize + i] = v[get_bits1(gb)];
106 for (j = 0; j < 4; j += 2)
107 for (i = 0; i < 4; i += 2)
108 decode2x2(gb, dst + j * linesize + i, linesize);
115 static inline void decode8x8(GetBitContext *gb, uint8_t *dst, int linesize,
120 switch (get_bits(gb, 2)) {
122 v[0] = get_bits(gb, 8);
123 dsp->fill_block_tab[1](dst, v[0], linesize, 8);
126 v[0] = get_bits(gb, 8);
127 v[1] = get_bits(gb, 8);
128 for (j = 7; j >= 0; j--)
129 for (i = 0; i < 8; i++)
130 dst[j * linesize + i] = v[get_bits1(gb)];
133 for (j = 0; j < 8; j += 4)
134 for (i = 0; i < 8; i += 4)
135 decode4x4(gb, dst + j * linesize + i, linesize);
139 static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
142 JvContext *s = avctx->priv_data;
143 int buf_size = avpkt->size;
144 const uint8_t *buf = avpkt->data;
145 const uint8_t *buf_end = buf + buf_size;
146 int video_size, video_type, i, j, ret;
148 video_size = AV_RL32(buf);
153 if ((ret = ff_reget_buffer(avctx, s->frame)) < 0) {
154 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
158 if (video_type == 0 || video_type == 1) {
160 init_get_bits(&gb, buf, 8 * FFMIN(video_size, buf_end - buf));
162 for (j = 0; j < avctx->height; j += 8)
163 for (i = 0; i < avctx->width; i += 8)
165 s->frame->data[0] + j * s->frame->linesize[0] + i,
166 s->frame->linesize[0], &s->dsp);
169 } else if (video_type == 2) {
170 if (buf + 1 <= buf_end) {
172 for (j = 0; j < avctx->height; j++)
173 memset(s->frame->data[0] + j * s->frame->linesize[0],
177 av_log(avctx, AV_LOG_WARNING,
178 "unsupported frame type %i\n", video_type);
179 return AVERROR_INVALIDDATA;
184 for (i = 0; i < AVPALETTE_COUNT && buf + 3 <= buf_end; i++) {
185 s->palette[i] = AV_RB24(buf) << 2;
188 s->palette_has_changed = 1;
192 s->frame->key_frame = 1;
193 s->frame->pict_type = AV_PICTURE_TYPE_I;
194 s->frame->palette_has_changed = s->palette_has_changed;
195 s->palette_has_changed = 0;
196 memcpy(s->frame->data[1], s->palette, AVPALETTE_SIZE);
198 if ((ret = av_frame_ref(data, s->frame)) < 0)
206 static av_cold int decode_close(AVCodecContext *avctx)
208 JvContext *s = avctx->priv_data;
210 av_frame_free(&s->frame);
215 AVCodec ff_jv_decoder = {
217 .long_name = NULL_IF_CONFIG_SMALL("Bitmap Brothers JV video"),
218 .type = AVMEDIA_TYPE_VIDEO,
219 .id = AV_CODEC_ID_JV,
220 .priv_data_size = sizeof(JvContext),
222 .close = decode_close,
223 .decode = decode_frame,
224 .capabilities = CODEC_CAP_DR1,