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https://git.ffmpeg.org/ffmpeg.git
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91ed4e7196
Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com> Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
191 lines
5.2 KiB
C
191 lines
5.2 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 Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "avcodec.h"
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#include "get_bits.h"
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#include "internal.h"
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typedef struct AvsContext {
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AVFrame *frame;
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} AvsContext;
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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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} AvsBlockType;
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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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} AvsVideoSubType;
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static int
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avs_decode_frame(AVCodecContext * avctx,
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void *data, int *got_frame, AVPacket *avpkt)
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{
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const uint8_t *buf = avpkt->data;
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const uint8_t *buf_end = avpkt->data + avpkt->size;
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int buf_size = avpkt->size;
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AvsContext *const avs = avctx->priv_data;
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AVFrame *picture = data;
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AVFrame *const p = avs->frame;
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const uint8_t *table, *vect;
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uint8_t *out;
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int i, j, x, y, stride, ret, vect_w = 3, vect_h = 3;
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AvsVideoSubType sub_type;
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AvsBlockType type;
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GetBitContext change_map = {0}; //init to silence warning
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if ((ret = ff_reget_buffer(avctx, p)) < 0)
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return ret;
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p->pict_type = AV_PICTURE_TYPE_P;
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p->key_frame = 0;
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out = p->data[0];
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stride = p->linesize[0];
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if (buf_end - buf < 4)
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return AVERROR_INVALIDDATA;
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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 *) p->data[1];
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first = AV_RL16(buf);
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last = first + AV_RL16(buf + 2);
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if (first >= 256 || last > 256 || buf_end - buf < 4 + 4 + 3 * (last - first))
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return AVERROR_INVALIDDATA;
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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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pal[i] |= 0xFFU << 24 | (pal[i] >> 6) & 0x30303;
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}
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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 AVERROR_INVALIDDATA;
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switch (sub_type) {
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case AVS_I_FRAME:
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p->pict_type = AV_PICTURE_TYPE_I;
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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 AVERROR_INVALIDDATA;
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}
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if (buf_end - buf < 256 * vect_w * vect_h)
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return AVERROR_INVALIDDATA;
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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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if (buf_end - table < map_size)
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return AVERROR_INVALIDDATA;
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init_get_bits(&change_map, table, map_size * 8);
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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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if (buf_end - table < 1)
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return AVERROR_INVALIDDATA;
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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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if ((ret = av_frame_ref(picture, p)) < 0)
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return ret;
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*got_frame = 1;
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return buf_size;
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}
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static av_cold int avs_decode_init(AVCodecContext * avctx)
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{
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AvsContext *s = avctx->priv_data;
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s->frame = av_frame_alloc();
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if (!s->frame)
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return AVERROR(ENOMEM);
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avctx->pix_fmt = AV_PIX_FMT_PAL8;
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return ff_set_dimensions(avctx, 318, 198);
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}
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static av_cold int avs_decode_end(AVCodecContext *avctx)
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{
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AvsContext *s = avctx->priv_data;
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av_frame_free(&s->frame);
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return 0;
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}
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AVCodec ff_avs_decoder = {
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.name = "avs",
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.long_name = NULL_IF_CONFIG_SMALL("AVS (Audio Video Standard) video"),
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_AVS,
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.priv_data_size = sizeof(AvsContext),
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.init = avs_decode_init,
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.decode = avs_decode_frame,
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.close = avs_decode_end,
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.capabilities = AV_CODEC_CAP_DR1,
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.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
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};
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