diff options
Diffstat (limited to 'ffmpeg/libavcodec/vcr1.c')
| -rw-r--r-- | ffmpeg/libavcodec/vcr1.c | 128 |
1 files changed, 128 insertions, 0 deletions
diff --git a/ffmpeg/libavcodec/vcr1.c b/ffmpeg/libavcodec/vcr1.c new file mode 100644 index 0000000..60bfcce --- /dev/null +++ b/ffmpeg/libavcodec/vcr1.c @@ -0,0 +1,128 @@ +/* + * ATI VCR1 codec + * Copyright (c) 2003 Michael Niedermayer + * + * 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 + */ + +/** + * @file + * ATI VCR1 codec + */ + +#include "avcodec.h" +#include "internal.h" +#include "libavutil/internal.h" + +typedef struct VCR1Context { + int delta[16]; + int offset[4]; +} VCR1Context; + +static av_cold int vcr1_decode_init(AVCodecContext *avctx) +{ + avctx->pix_fmt = AV_PIX_FMT_YUV410P; + + if (avctx->width % 8 || avctx->height%4) { + avpriv_request_sample(avctx, "odd dimensions support"); + return AVERROR_PATCHWELCOME; + } + return 0; +} + +static int vcr1_decode_frame(AVCodecContext *avctx, void *data, + int *got_frame, AVPacket *avpkt) +{ + const uint8_t *buf = avpkt->data; + int buf_size = avpkt->size; + VCR1Context *const a = avctx->priv_data; + AVFrame *const p = data; + const uint8_t *bytestream = buf; + int i, x, y, ret; + + if(buf_size < 16 + avctx->height + avctx->width*avctx->height*5/8){ + av_log(avctx, AV_LOG_ERROR, "Insufficient input data.\n"); + return AVERROR(EINVAL); + } + + if ((ret = ff_get_buffer(avctx, p, 0)) < 0) + return ret; + p->pict_type = AV_PICTURE_TYPE_I; + p->key_frame = 1; + + for (i = 0; i < 16; i++) { + a->delta[i] = *bytestream++; + bytestream++; + } + + for (y = 0; y < avctx->height; y++) { + int offset; + uint8_t *luma = &p->data[0][y * p->linesize[0]]; + + if ((y & 3) == 0) { + uint8_t *cb = &p->data[1][(y >> 2) * p->linesize[1]]; + uint8_t *cr = &p->data[2][(y >> 2) * p->linesize[2]]; + + for (i = 0; i < 4; i++) + a->offset[i] = *bytestream++; + + offset = a->offset[0] - a->delta[bytestream[2] & 0xF]; + for (x = 0; x < avctx->width; x += 4) { + luma[0] = offset += a->delta[bytestream[2] & 0xF]; + luma[1] = offset += a->delta[bytestream[2] >> 4]; + luma[2] = offset += a->delta[bytestream[0] & 0xF]; + luma[3] = offset += a->delta[bytestream[0] >> 4]; + luma += 4; + + *cb++ = bytestream[3]; + *cr++ = bytestream[1]; + + bytestream += 4; + } + } else { + offset = a->offset[y & 3] - a->delta[bytestream[2] & 0xF]; + + for (x = 0; x < avctx->width; x += 8) { + luma[0] = offset += a->delta[bytestream[2] & 0xF]; + luma[1] = offset += a->delta[bytestream[2] >> 4]; + luma[2] = offset += a->delta[bytestream[3] & 0xF]; + luma[3] = offset += a->delta[bytestream[3] >> 4]; + luma[4] = offset += a->delta[bytestream[0] & 0xF]; + luma[5] = offset += a->delta[bytestream[0] >> 4]; + luma[6] = offset += a->delta[bytestream[1] & 0xF]; + luma[7] = offset += a->delta[bytestream[1] >> 4]; + luma += 8; + bytestream += 4; + } + } + } + + *got_frame = 1; + + return buf_size; +} + +AVCodec ff_vcr1_decoder = { + .name = "vcr1", + .type = AVMEDIA_TYPE_VIDEO, + .id = AV_CODEC_ID_VCR1, + .priv_data_size = sizeof(VCR1Context), + .init = vcr1_decode_init, + .decode = vcr1_decode_frame, + .capabilities = CODEC_CAP_DR1, + .long_name = NULL_IF_CONFIG_SMALL("ATI VCR1"), +}; |