| /* |
| * 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, |
| }; |