yading@10: /* yading@10: * AVS video decoder. yading@10: * Copyright (c) 2006 Aurelien Jacobs yading@10: * yading@10: * This file is part of FFmpeg. yading@10: * yading@10: * FFmpeg is free software; you can redistribute it and/or yading@10: * modify it under the terms of the GNU Lesser General Public yading@10: * License as published by the Free Software Foundation; either yading@10: * version 2.1 of the License, or (at your option) any later version. yading@10: * yading@10: * FFmpeg is distributed in the hope that it will be useful, yading@10: * but WITHOUT ANY WARRANTY; without even the implied warranty of yading@10: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU yading@10: * Lesser General Public License for more details. yading@10: * yading@10: * You should have received a copy of the GNU Lesser General Public yading@10: * License along with FFmpeg; if not, write to the Free Software yading@10: * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA yading@10: */ yading@10: yading@10: #include "avcodec.h" yading@10: #include "get_bits.h" yading@10: #include "internal.h" yading@10: yading@10: yading@10: typedef struct { yading@10: AVFrame picture; yading@10: } AvsContext; yading@10: yading@10: typedef enum { yading@10: AVS_VIDEO = 0x01, yading@10: AVS_AUDIO = 0x02, yading@10: AVS_PALETTE = 0x03, yading@10: AVS_GAME_DATA = 0x04, yading@10: } AvsBlockType; yading@10: yading@10: typedef enum { yading@10: AVS_I_FRAME = 0x00, yading@10: AVS_P_FRAME_3X3 = 0x01, yading@10: AVS_P_FRAME_2X2 = 0x02, yading@10: AVS_P_FRAME_2X3 = 0x03, yading@10: } AvsVideoSubType; yading@10: yading@10: yading@10: static int yading@10: avs_decode_frame(AVCodecContext * avctx, yading@10: void *data, int *got_frame, AVPacket *avpkt) yading@10: { yading@10: const uint8_t *buf = avpkt->data; yading@10: const uint8_t *buf_end = avpkt->data + avpkt->size; yading@10: int buf_size = avpkt->size; yading@10: AvsContext *const avs = avctx->priv_data; yading@10: AVFrame *picture = data; yading@10: AVFrame *const p = &avs->picture; yading@10: const uint8_t *table, *vect; yading@10: uint8_t *out; yading@10: int i, j, x, y, stride, ret, vect_w = 3, vect_h = 3; yading@10: AvsVideoSubType sub_type; yading@10: AvsBlockType type; yading@10: GetBitContext change_map = {0}; //init to silence warning yading@10: yading@10: if ((ret = ff_reget_buffer(avctx, p)) < 0) yading@10: return ret; yading@10: p->pict_type = AV_PICTURE_TYPE_P; yading@10: p->key_frame = 0; yading@10: yading@10: out = avs->picture.data[0]; yading@10: stride = avs->picture.linesize[0]; yading@10: yading@10: if (buf_end - buf < 4) yading@10: return AVERROR_INVALIDDATA; yading@10: sub_type = buf[0]; yading@10: type = buf[1]; yading@10: buf += 4; yading@10: yading@10: if (type == AVS_PALETTE) { yading@10: int first, last; yading@10: uint32_t *pal = (uint32_t *) avs->picture.data[1]; yading@10: yading@10: first = AV_RL16(buf); yading@10: last = first + AV_RL16(buf + 2); yading@10: if (first >= 256 || last > 256 || buf_end - buf < 4 + 4 + 3 * (last - first)) yading@10: return AVERROR_INVALIDDATA; yading@10: buf += 4; yading@10: for (i=first; i> 6) & 0x30303; yading@10: } yading@10: yading@10: sub_type = buf[0]; yading@10: type = buf[1]; yading@10: buf += 4; yading@10: } yading@10: yading@10: if (type != AVS_VIDEO) yading@10: return AVERROR_INVALIDDATA; yading@10: yading@10: switch (sub_type) { yading@10: case AVS_I_FRAME: yading@10: p->pict_type = AV_PICTURE_TYPE_I; yading@10: p->key_frame = 1; yading@10: case AVS_P_FRAME_3X3: yading@10: vect_w = 3; yading@10: vect_h = 3; yading@10: break; yading@10: yading@10: case AVS_P_FRAME_2X2: yading@10: vect_w = 2; yading@10: vect_h = 2; yading@10: break; yading@10: yading@10: case AVS_P_FRAME_2X3: yading@10: vect_w = 2; yading@10: vect_h = 3; yading@10: break; yading@10: yading@10: default: yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: yading@10: if (buf_end - buf < 256 * vect_w * vect_h) yading@10: return AVERROR_INVALIDDATA; yading@10: table = buf + (256 * vect_w * vect_h); yading@10: if (sub_type != AVS_I_FRAME) { yading@10: int map_size = ((318 / vect_w + 7) / 8) * (198 / vect_h); yading@10: if (buf_end - table < map_size) yading@10: return AVERROR_INVALIDDATA; yading@10: init_get_bits(&change_map, table, map_size * 8); yading@10: table += map_size; yading@10: } yading@10: yading@10: for (y=0; y<198; y+=vect_h) { yading@10: for (x=0; x<318; x+=vect_w) { yading@10: if (sub_type == AVS_I_FRAME || get_bits1(&change_map)) { yading@10: if (buf_end - table < 1) yading@10: return AVERROR_INVALIDDATA; yading@10: vect = &buf[*table++ * (vect_w * vect_h)]; yading@10: for (j=0; jpicture)) < 0) yading@10: return ret; yading@10: *got_frame = 1; yading@10: yading@10: return buf_size; yading@10: } yading@10: yading@10: static av_cold int avs_decode_init(AVCodecContext * avctx) yading@10: { yading@10: AvsContext *s = avctx->priv_data; yading@10: avctx->pix_fmt = AV_PIX_FMT_PAL8; yading@10: avcodec_set_dimensions(avctx, 318, 198); yading@10: avcodec_get_frame_defaults(&s->picture); yading@10: return 0; yading@10: } yading@10: yading@10: static av_cold int avs_decode_end(AVCodecContext *avctx) yading@10: { yading@10: AvsContext *s = avctx->priv_data; yading@10: av_frame_unref(&s->picture); yading@10: return 0; yading@10: } yading@10: yading@10: yading@10: AVCodec ff_avs_decoder = { yading@10: .name = "avs", yading@10: .type = AVMEDIA_TYPE_VIDEO, yading@10: .id = AV_CODEC_ID_AVS, yading@10: .priv_data_size = sizeof(AvsContext), yading@10: .init = avs_decode_init, yading@10: .decode = avs_decode_frame, yading@10: .close = avs_decode_end, yading@10: .capabilities = CODEC_CAP_DR1, yading@10: .long_name = NULL_IF_CONFIG_SMALL("AVS (Audio Video Standard) video"), yading@10: };