| @@ -0,0 +1,116 @@ |
| 1 | +/* |
| 2 | + * Copyright (c) 2016 Michael Niedermayer |
| 3 | + * |
| 4 | + * This file is part of FFmpeg. |
| 5 | + * |
| 6 | + * FFmpeg is free software; you can redistribute it and/or |
| 7 | + * modify it under the terms of the GNU Lesser General Public |
| 8 | + * License as published by the Free Software Foundation; either |
| 9 | + * version 2.1 of the License, or (at your option) any later version. |
| 10 | + * |
| 11 | + * FFmpeg is distributed in the hope that it will be useful, |
| 12 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 14 | + * Lesser General Public License for more details. |
| 15 | + * |
| 16 | + * You should have received a copy of the GNU Lesser General Public |
| 17 | + * License along with FFmpeg; if not, write to the Free Software |
| 18 | + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 19 | + */ |
| 20 | + |
| 21 | +#include "libavutil/intreadwrite.h" |
| 22 | + |
| 23 | +#include "avcodec.h" |
| 24 | +#include "internal.h" |
| 25 | + |
| 26 | + |
| 27 | +static av_cold int m101_decode_init(AVCodecContext *avctx) |
| 28 | +{ |
| 29 | + if (avctx->extradata_size < 6*4) |
| 30 | + return AVERROR_INVALIDDATA; |
| 31 | + |
| 32 | + if (avctx->extradata[2*4] == 10) |
| 33 | + avctx->pix_fmt = AV_PIX_FMT_YUV422P10; |
| 34 | + else |
| 35 | + avctx->pix_fmt = AV_PIX_FMT_YUYV422; |
| 36 | + |
| 37 | + |
| 38 | + return 0; |
| 39 | +} |
| 40 | + |
| 41 | +static int m101_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, |
| 42 | + AVPacket *avpkt) |
| 43 | +{ |
| 44 | + const uint8_t *buf = avpkt->data; |
| 45 | + int stride, ret; |
| 46 | + int x, y; |
| 47 | + int min_stride = 2 * avctx->width; |
| 48 | + uint8_t *line; |
| 49 | + int bits = avctx->extradata[2*4]; |
| 50 | + AVFrame *frame = data; |
| 51 | + |
| 52 | + if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) |
| 53 | + return ret; |
| 54 | + frame->pict_type = AV_PICTURE_TYPE_I; |
| 55 | + frame->key_frame = 1; |
| 56 | + |
| 57 | + stride = AV_RL32(avctx->extradata + 5*4); |
| 58 | + |
| 59 | + if (avctx->pix_fmt == AV_PIX_FMT_YUV422P10) |
| 60 | + min_stride = (avctx->width + 15) / 16 * 20; |
| 61 | + |
| 62 | + if (stride < min_stride || avpkt->size < stride * (uint64_t)avctx->height) { |
| 63 | + av_log(avctx, AV_LOG_ERROR, "stride (%d) is invalid for packet sized %d\n", |
| 64 | + stride, avpkt->size); |
| 65 | + return AVERROR_INVALIDDATA; |
| 66 | + } |
| 67 | + |
| 68 | + line = frame->data[0]; |
| 69 | + frame->interlaced_frame = ((avctx->extradata[3*4] & 3) != 3); |
| 70 | + if (frame->interlaced_frame) |
| 71 | + frame->top_field_first = avctx->extradata[3*4] & 1; |
| 72 | + |
| 73 | + for (y = 0; y < avctx->height; y++) { |
| 74 | + int src_y = y; |
| 75 | + if (frame->interlaced_frame) |
| 76 | + src_y = ((y&1)^frame->top_field_first) ? y/2 : (y/2 + avctx->height/2); |
| 77 | + if (bits == 8) { |
| 78 | + for (x = 0; x < avctx->width; x++) { |
| 79 | + line[y*frame->linesize[0] + 2*x + 0] = buf[src_y*stride + 2*x + 0]; |
| 80 | + line[y*frame->linesize[0] + 2*x + 1] = buf[src_y*stride + 2*x + 1]; |
| 81 | + } |
| 82 | + } else { |
| 83 | + int block; |
| 84 | + uint16_t *luma = (uint16_t*)&frame->data[0][y*frame->linesize[0]]; |
| 85 | + uint16_t *cb = (uint16_t*)&frame->data[1][y*frame->linesize[1]]; |
| 86 | + uint16_t *cr = (uint16_t*)&frame->data[2][y*frame->linesize[2]]; |
| 87 | + for (block = 0; 16*block < avctx->width; block ++) { |
| 88 | + const uint8_t *buf_src = buf + src_y*stride + 40*block; |
| 89 | + for (x = 0; x < 16 && x + 16*block < avctx->width; x++) { |
| 90 | + int xd = x + 16*block; |
| 91 | + if (!(x&1)) { |
| 92 | + luma [xd] = (4*buf_src[2*x + 0]) + (buf_src[32 + (x>>1)] &3); |
| 93 | + cb[xd>>1] = (4*buf_src[2*x + 1]) + ((buf_src[32 + (x>>1)]>>2)&3); |
| 94 | + cr[xd>>1] = (4*buf_src[2*x + 3]) + (buf_src[32 + (x>>1)]>>6); |
| 95 | + } else { |
| 96 | + luma [xd] = (4*buf_src[2*x + 0]) + ((buf_src[32 + (x>>1)]>>4)&3); |
| 97 | + } |
| 98 | + } |
| 99 | + } |
| 100 | + } |
| 101 | + } |
| 102 | + |
| 103 | + *got_frame = 1; |
| 104 | + return avpkt->size; |
| 105 | +} |
| 106 | + |
| 107 | +AVCodec ff_m101_decoder = { |
| 108 | + .name = "m101", |
| 109 | + .long_name = NULL_IF_CONFIG_SMALL("Matrox Uncompressed SD"), |
| 110 | + .type = AVMEDIA_TYPE_VIDEO, |
| 111 | + .id = AV_CODEC_ID_M101, |
| 112 | + .priv_data_size = 0, |
| 113 | + .init = m101_decode_init, |
| 114 | + .decode = m101_decode_frame, |
| 115 | + .capabilities = AV_CODEC_CAP_DR1, |
| 116 | +}; |