diff options
Diffstat (limited to 'ffmpeg1/libavcodec/avs.c')
| -rw-r--r-- | ffmpeg1/libavcodec/avs.c | 186 |
1 files changed, 186 insertions, 0 deletions
diff --git a/ffmpeg1/libavcodec/avs.c b/ffmpeg1/libavcodec/avs.c new file mode 100644 index 0000000..e3733d7 --- /dev/null +++ b/ffmpeg1/libavcodec/avs.c @@ -0,0 +1,186 @@ +/* + * AVS video decoder. + * Copyright (c) 2006 Aurelien Jacobs <aurel@gnuage.org> + * + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * FFmpeg is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include "avcodec.h" +#include "get_bits.h" +#include "internal.h" + + +typedef struct { + AVFrame picture; +} AvsContext; + +typedef enum { + AVS_VIDEO = 0x01, + AVS_AUDIO = 0x02, + AVS_PALETTE = 0x03, + AVS_GAME_DATA = 0x04, +} AvsBlockType; + +typedef enum { + AVS_I_FRAME = 0x00, + AVS_P_FRAME_3X3 = 0x01, + AVS_P_FRAME_2X2 = 0x02, + AVS_P_FRAME_2X3 = 0x03, +} AvsVideoSubType; + + +static int +avs_decode_frame(AVCodecContext * avctx, + void *data, int *got_frame, AVPacket *avpkt) +{ + const uint8_t *buf = avpkt->data; + const uint8_t *buf_end = avpkt->data + avpkt->size; + int buf_size = avpkt->size; + AvsContext *const avs = avctx->priv_data; + AVFrame *picture = data; + AVFrame *const p = &avs->picture; + const uint8_t *table, *vect; + uint8_t *out; + int i, j, x, y, stride, ret, vect_w = 3, vect_h = 3; + AvsVideoSubType sub_type; + AvsBlockType type; + GetBitContext change_map = {0}; //init to silence warning + + if ((ret = ff_reget_buffer(avctx, p)) < 0) + return ret; + p->pict_type = AV_PICTURE_TYPE_P; + p->key_frame = 0; + + out = avs->picture.data[0]; + stride = avs->picture.linesize[0]; + + if (buf_end - buf < 4) + return AVERROR_INVALIDDATA; + sub_type = buf[0]; + type = buf[1]; + buf += 4; + + if (type == AVS_PALETTE) { + int first, last; + uint32_t *pal = (uint32_t *) avs->picture.data[1]; + + first = AV_RL16(buf); + last = first + AV_RL16(buf + 2); + if (first >= 256 || last > 256 || buf_end - buf < 4 + 4 + 3 * (last - first)) + return AVERROR_INVALIDDATA; + buf += 4; + for (i=first; i<last; i++, buf+=3) { + pal[i] = (buf[0] << 18) | (buf[1] << 10) | (buf[2] << 2); + pal[i] |= 0xFFU << 24 | (pal[i] >> 6) & 0x30303; + } + + sub_type = buf[0]; + type = buf[1]; + buf += 4; + } + + if (type != AVS_VIDEO) + return AVERROR_INVALIDDATA; + + switch (sub_type) { + case AVS_I_FRAME: + p->pict_type = AV_PICTURE_TYPE_I; + p->key_frame = 1; + case AVS_P_FRAME_3X3: + vect_w = 3; + vect_h = 3; + break; + + case AVS_P_FRAME_2X2: + vect_w = 2; + vect_h = 2; + break; + + case AVS_P_FRAME_2X3: + vect_w = 2; + vect_h = 3; + break; + + default: + return AVERROR_INVALIDDATA; + } + + if (buf_end - buf < 256 * vect_w * vect_h) + return AVERROR_INVALIDDATA; + table = buf + (256 * vect_w * vect_h); + if (sub_type != AVS_I_FRAME) { + int map_size = ((318 / vect_w + 7) / 8) * (198 / vect_h); + if (buf_end - table < map_size) + return AVERROR_INVALIDDATA; + init_get_bits(&change_map, table, map_size * 8); + table += map_size; + } + + for (y=0; y<198; y+=vect_h) { + for (x=0; x<318; x+=vect_w) { + if (sub_type == AVS_I_FRAME || get_bits1(&change_map)) { + if (buf_end - table < 1) + return AVERROR_INVALIDDATA; + vect = &buf[*table++ * (vect_w * vect_h)]; + for (j=0; j<vect_w; j++) { + out[(y + 0) * stride + x + j] = vect[(0 * vect_w) + j]; + out[(y + 1) * stride + x + j] = vect[(1 * vect_w) + j]; + if (vect_h == 3) + out[(y + 2) * stride + x + j] = + vect[(2 * vect_w) + j]; + } + } + } + if (sub_type != AVS_I_FRAME) + align_get_bits(&change_map); + } + + if ((ret = av_frame_ref(picture, &avs->picture)) < 0) + return ret; + *got_frame = 1; + + return buf_size; +} + +static av_cold int avs_decode_init(AVCodecContext * avctx) +{ + AvsContext *s = avctx->priv_data; + avctx->pix_fmt = AV_PIX_FMT_PAL8; + avcodec_set_dimensions(avctx, 318, 198); + avcodec_get_frame_defaults(&s->picture); + return 0; +} + +static av_cold int avs_decode_end(AVCodecContext *avctx) +{ + AvsContext *s = avctx->priv_data; + av_frame_unref(&s->picture); + return 0; +} + + +AVCodec ff_avs_decoder = { + .name = "avs", + .type = AVMEDIA_TYPE_VIDEO, + .id = AV_CODEC_ID_AVS, + .priv_data_size = sizeof(AvsContext), + .init = avs_decode_init, + .decode = avs_decode_frame, + .close = avs_decode_end, + .capabilities = CODEC_CAP_DR1, + .long_name = NULL_IF_CONFIG_SMALL("AVS (Audio Video Standard) video"), +}; |