161 lines
4.0 KiB
C
161 lines
4.0 KiB
C
/*
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* AVS video decoder.
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* Copyright (c) 2006 Aurelien Jacobs <aurel@gnuage.org>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "avcodec.h"
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#include "bitstream.h"
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typedef struct {
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AVFrame picture;
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} avs_context_t;
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typedef enum {
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AVS_VIDEO = 0x01,
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AVS_AUDIO = 0x02,
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AVS_PALETTE = 0x03,
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AVS_GAME_DATA = 0x04,
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} avs_block_type_t;
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typedef enum {
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AVS_I_FRAME = 0x00,
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AVS_P_FRAME_3X3 = 0x01,
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AVS_P_FRAME_2X2 = 0x02,
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AVS_P_FRAME_2X3 = 0x03,
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} avs_video_sub_type_t;
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static int
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avs_decode_frame(AVCodecContext * avctx,
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void *data, int *data_size, uint8_t * buf, int buf_size)
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{
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avs_context_t *const avs = avctx->priv_data;
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AVFrame *picture = data;
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AVFrame *const p = (AVFrame *) & avs->picture;
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uint8_t *table, *vect, *out;
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int i, j, x, y, stride, vect_w = 3, vect_h = 3;
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int sub_type;
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avs_block_type_t type;
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GetBitContext change_map;
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if (avctx->reget_buffer(avctx, p)) {
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av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
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return -1;
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}
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p->reference = 1;
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p->pict_type = FF_P_TYPE;
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p->key_frame = 0;
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out = avs->picture.data[0];
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stride = avs->picture.linesize[0];
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sub_type = buf[0];
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type = buf[1];
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buf += 4;
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if (type == AVS_PALETTE) {
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int first, last;
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uint32_t *pal = (uint32_t *) avs->picture.data[1];
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first = AV_RL16(buf);
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last = first + AV_RL16(buf + 2);
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buf += 4;
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for (i=first; i<last; i++, buf+=3)
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pal[i] = (buf[0] << 18) | (buf[1] << 10) | (buf[2] << 2);
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sub_type = buf[0];
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type = buf[1];
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buf += 4;
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}
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if (type != AVS_VIDEO)
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return -1;
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switch (sub_type) {
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case AVS_I_FRAME:
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p->pict_type = FF_I_TYPE;
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p->key_frame = 1;
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case AVS_P_FRAME_3X3:
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vect_w = 3;
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vect_h = 3;
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break;
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case AVS_P_FRAME_2X2:
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vect_w = 2;
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vect_h = 2;
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break;
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case AVS_P_FRAME_2X3:
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vect_w = 2;
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vect_h = 3;
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break;
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default:
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return -1;
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}
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table = buf + (256 * vect_w * vect_h);
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if (sub_type != AVS_I_FRAME) {
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int map_size = ((318 / vect_w + 7) / 8) * (198 / vect_h);
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init_get_bits(&change_map, table, map_size);
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table += map_size;
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}
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for (y=0; y<198; y+=vect_h) {
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for (x=0; x<318; x+=vect_w) {
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if (sub_type == AVS_I_FRAME || get_bits1(&change_map)) {
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vect = &buf[*table++ * (vect_w * vect_h)];
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for (j=0; j<vect_w; j++) {
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out[(y + 0) * stride + x + j] = vect[(0 * vect_w) + j];
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out[(y + 1) * stride + x + j] = vect[(1 * vect_w) + j];
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if (vect_h == 3)
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out[(y + 2) * stride + x + j] =
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vect[(2 * vect_w) + j];
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}
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}
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}
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if (sub_type != AVS_I_FRAME)
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align_get_bits(&change_map);
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}
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*picture = *(AVFrame *) & avs->picture;
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*data_size = sizeof(AVPicture);
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return buf_size;
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}
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static int avs_decode_init(AVCodecContext * avctx)
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{
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avctx->pix_fmt = PIX_FMT_PAL8;
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return 0;
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}
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AVCodec avs_decoder = {
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"avs",
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CODEC_TYPE_VIDEO,
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CODEC_ID_AVS,
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sizeof(avs_context_t),
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avs_decode_init,
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NULL,
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NULL,
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avs_decode_frame,
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CODEC_CAP_DR1,
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};
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