1/* 2 * Bitmap Brothers JV video decoder 3 * Copyright (c) 2011 Peter Ross <pross@xvid.org> 4 * 5 * This file is part of FFmpeg. 6 * 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. 11 * 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. 16 * 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 20 */ 21 22/** 23 * @file 24 * Bitmap Brothers JV video decoder 25 * @author Peter Ross <pross@xvid.org> 26 */ 27 28#include "libavutil/intreadwrite.h" 29 30#include "avcodec.h" 31#include "blockdsp.h" 32#include "get_bits.h" 33#include "internal.h" 34 35typedef struct JvContext { 36 BlockDSPContext bdsp; 37 AVFrame *frame; 38 uint32_t palette[AVPALETTE_COUNT]; 39 int palette_has_changed; 40} JvContext; 41 42static av_cold int decode_init(AVCodecContext *avctx) 43{ 44 JvContext *s = avctx->priv_data; 45 46 s->frame = av_frame_alloc(); 47 if (!s->frame) 48 return AVERROR(ENOMEM); 49 50 avctx->pix_fmt = AV_PIX_FMT_PAL8; 51 ff_blockdsp_init(&s->bdsp, avctx); 52 return 0; 53} 54 55/** 56 * Decode 2x2 block 57 */ 58static inline void decode2x2(GetBitContext *gb, uint8_t *dst, int linesize) 59{ 60 int i, j, v[2]; 61 62 switch (get_bits(gb, 2)) { 63 case 1: 64 v[0] = get_bits(gb, 8); 65 for (j = 0; j < 2; j++) 66 memset(dst + j * linesize, v[0], 2); 67 break; 68 case 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)]; 74 break; 75 case 3: 76 for (j = 0; j < 2; j++) 77 for (i = 0; i < 2; i++) 78 dst[j * linesize + i] = get_bits(gb, 8); 79 } 80} 81 82/** 83 * Decode 4x4 block 84 */ 85static inline void decode4x4(GetBitContext *gb, uint8_t *dst, int linesize) 86{ 87 int i, j, v[2]; 88 89 switch (get_bits(gb, 2)) { 90 case 1: 91 v[0] = get_bits(gb, 8); 92 for (j = 0; j < 4; j++) 93 memset(dst + j * linesize, v[0], 4); 94 break; 95 case 2: 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)]; 103 } 104 break; 105 case 3: 106 for (j = 0; j < 4; j += 2) 107 for (i = 0; i < 4; i += 2) 108 decode2x2(gb, dst + j * linesize + i, linesize); 109 } 110} 111 112/** 113 * Decode 8x8 block 114 */ 115static inline void decode8x8(GetBitContext *gb, uint8_t *dst, int linesize, 116 BlockDSPContext *bdsp) 117{ 118 int i, j, v[2]; 119 120 switch (get_bits(gb, 2)) { 121 case 1: 122 v[0] = get_bits(gb, 8); 123 bdsp->fill_block_tab[1](dst, v[0], linesize, 8); 124 break; 125 case 2: 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)]; 131 break; 132 case 3: 133 for (j = 0; j < 8; j += 4) 134 for (i = 0; i < 8; i += 4) 135 decode4x4(gb, dst + j * linesize + i, linesize); 136 } 137} 138 139static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, 140 AVPacket *avpkt) 141{ 142 JvContext *s = avctx->priv_data; 143 const uint8_t *buf = avpkt->data; 144 const uint8_t *buf_end = buf + avpkt->size; 145 int video_size, video_type, i, j, ret; 146 147 if (avpkt->size < 6) 148 return AVERROR_INVALIDDATA; 149 150 video_size = AV_RL32(buf); 151 video_type = buf[4]; 152 buf += 5; 153 154 if (video_size) { 155 if (video_size < 0 || video_size > avpkt->size - 5) { 156 av_log(avctx, AV_LOG_ERROR, "video size %d invalid\n", video_size); 157 return AVERROR_INVALIDDATA; 158 } 159 if ((ret = ff_reget_buffer(avctx, s->frame)) < 0) 160 return ret; 161 162 if (video_type == 0 || video_type == 1) { 163 GetBitContext gb; 164 init_get_bits(&gb, buf, 8 * video_size); 165 166 for (j = 0; j < avctx->height; j += 8) 167 for (i = 0; i < avctx->width; i += 8) 168 decode8x8(&gb, 169 s->frame->data[0] + j * s->frame->linesize[0] + i, 170 s->frame->linesize[0], &s->bdsp); 171 172 buf += video_size; 173 } else if (video_type == 2) { 174 int v = *buf++; 175 for (j = 0; j < avctx->height; j++) 176 memset(s->frame->data[0] + j * s->frame->linesize[0], 177 v, avctx->width); 178 } else { 179 av_log(avctx, AV_LOG_WARNING, 180 "unsupported frame type %i\n", video_type); 181 return AVERROR_INVALIDDATA; 182 } 183 } 184 185 if (buf_end - buf >= AVPALETTE_COUNT * 3) { 186 for (i = 0; i < AVPALETTE_COUNT; i++) { 187 uint32_t pal = AV_RB24(buf); 188 s->palette[i] = 0xFFU << 24 | pal << 2 | ((pal >> 4) & 0x30303); 189 buf += 3; 190 } 191 s->palette_has_changed = 1; 192 } 193 194 if (video_size) { 195 s->frame->key_frame = 1; 196 s->frame->pict_type = AV_PICTURE_TYPE_I; 197 s->frame->palette_has_changed = s->palette_has_changed; 198 s->palette_has_changed = 0; 199 memcpy(s->frame->data[1], s->palette, AVPALETTE_SIZE); 200 201 if ((ret = av_frame_ref(data, s->frame)) < 0) 202 return ret; 203 *got_frame = 1; 204 } 205 206 return avpkt->size; 207} 208 209static av_cold int decode_close(AVCodecContext *avctx) 210{ 211 JvContext *s = avctx->priv_data; 212 213 av_frame_free(&s->frame); 214 215 return 0; 216} 217 218AVCodec ff_jv_decoder = { 219 .name = "jv", 220 .long_name = NULL_IF_CONFIG_SMALL("Bitmap Brothers JV video"), 221 .type = AVMEDIA_TYPE_VIDEO, 222 .id = AV_CODEC_ID_JV, 223 .priv_data_size = sizeof(JvContext), 224 .init = decode_init, 225 .close = decode_close, 226 .decode = decode_frame, 227 .capabilities = CODEC_CAP_DR1, 228}; 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