diff options
Diffstat (limited to 'libavcodec/m101.c')
| -rw-r--r-- | libavcodec/m101.c | 116 |
1 files changed, 116 insertions, 0 deletions
diff --git a/libavcodec/m101.c b/libavcodec/m101.c new file mode 100644 index 0000000000..d2549668fd --- /dev/null +++ b/libavcodec/m101.c @@ -0,0 +1,116 @@ +/* + * Copyright (c) 2016 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 + */ + +#include "libavutil/intreadwrite.h" + +#include "avcodec.h" +#include "internal.h" + + +static av_cold int m101_decode_init(AVCodecContext *avctx) +{ + if (avctx->extradata_size < 6*4) { + avpriv_request_sample(avctx, "Missing or too small extradata (size %d)", avctx->extradata_size); + return AVERROR_INVALIDDATA; + } + + if (avctx->extradata[2*4] == 10) + avctx->pix_fmt = AV_PIX_FMT_YUV422P10; + else if (avctx->extradata[2*4] == 8) { + avctx->pix_fmt = AV_PIX_FMT_YUYV422; + } else { + avpriv_request_sample(avctx, "BPS %d", avctx->extradata[2*4]); + return AVERROR_INVALIDDATA; + } + + return 0; +} + +static int m101_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, + AVPacket *avpkt) +{ + const uint8_t *buf = avpkt->data; + int stride, ret; + int x, y; + int min_stride = 2 * avctx->width; + int bits = avctx->extradata[2*4]; + AVFrame *frame = data; + + if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) + return ret; + frame->pict_type = AV_PICTURE_TYPE_I; + frame->key_frame = 1; + + stride = AV_RL32(avctx->extradata + 5*4); + + if (avctx->pix_fmt == AV_PIX_FMT_YUV422P10) + min_stride = (avctx->width + 15) / 16 * 20; + + if (stride < min_stride || avpkt->size < stride * (uint64_t)avctx->height) { + av_log(avctx, AV_LOG_ERROR, "stride (%d) is invalid for packet sized %d\n", + stride, avpkt->size); + return AVERROR_INVALIDDATA; + } + + frame->interlaced_frame = ((avctx->extradata[3*4] & 3) != 3); + if (frame->interlaced_frame) + frame->top_field_first = avctx->extradata[3*4] & 1; + + for (y = 0; y < avctx->height; y++) { + int src_y = y; + if (frame->interlaced_frame) + src_y = ((y&1)^frame->top_field_first) ? y/2 : (y/2 + avctx->height/2); + if (bits == 8) { + uint8_t *line = frame->data[0] + y*frame->linesize[0]; + memcpy(line, buf + src_y*stride, 2*avctx->width); + } else { + int block; + uint16_t *luma = (uint16_t*)&frame->data[0][y*frame->linesize[0]]; + uint16_t *cb = (uint16_t*)&frame->data[1][y*frame->linesize[1]]; + uint16_t *cr = (uint16_t*)&frame->data[2][y*frame->linesize[2]]; + for (block = 0; 16*block < avctx->width; block ++) { + const uint8_t *buf_src = buf + src_y*stride + 40*block; + for (x = 0; x < 16 && x + 16*block < avctx->width; x++) { + int xd = x + 16*block; + if (x&1) { + luma [xd] = (4*buf_src[2*x + 0]) + ((buf_src[32 + (x>>1)]>>4)&3); + } else { + luma [xd] = (4*buf_src[2*x + 0]) + (buf_src[32 + (x>>1)] &3); + cb[xd>>1] = (4*buf_src[2*x + 1]) + ((buf_src[32 + (x>>1)]>>2)&3); + cr[xd>>1] = (4*buf_src[2*x + 3]) + (buf_src[32 + (x>>1)]>>6); + } + } + } + } + } + + *got_frame = 1; + return avpkt->size; +} + +AVCodec ff_m101_decoder = { + .name = "m101", + .long_name = NULL_IF_CONFIG_SMALL("Matrox Uncompressed SD"), + .type = AVMEDIA_TYPE_VIDEO, + .id = AV_CODEC_ID_M101, + .init = m101_decode_init, + .decode = m101_decode_frame, + .capabilities = AV_CODEC_CAP_DR1, +}; |