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 "codec_internal.h" 25#include "internal.h" 26 27 28static av_cold int m101_decode_init(AVCodecContext *avctx) 29{ 30 if (avctx->extradata_size < 6*4) { 31 avpriv_request_sample(avctx, "Missing or too small extradata (size %d)", avctx->extradata_size); 32 return AVERROR_INVALIDDATA; 33 } 34 35 if (avctx->extradata[2*4] == 10) 36 avctx->pix_fmt = AV_PIX_FMT_YUV422P10; 37 else if (avctx->extradata[2*4] == 8) { 38 avctx->pix_fmt = AV_PIX_FMT_YUYV422; 39 } else { 40 avpriv_request_sample(avctx, "BPS %d", avctx->extradata[2*4]); 41 return AVERROR_INVALIDDATA; 42 } 43 44 return 0; 45} 46 47static int m101_decode_frame(AVCodecContext *avctx, AVFrame *frame, 48 int *got_frame, AVPacket *avpkt) 49{ 50 const uint8_t *buf = avpkt->data; 51 int stride, ret; 52 int x, y; 53 int min_stride = 2 * avctx->width; 54 int bits = avctx->extradata[2*4]; 55 56 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) 57 return ret; 58 frame->pict_type = AV_PICTURE_TYPE_I; 59 frame->key_frame = 1; 60 61 stride = AV_RL32(avctx->extradata + 5*4); 62 63 if (avctx->pix_fmt == AV_PIX_FMT_YUV422P10) 64 min_stride = (avctx->width + 15) / 16 * 40; 65 66 if (stride < min_stride || avpkt->size < stride * (uint64_t)avctx->height) { 67 av_log(avctx, AV_LOG_ERROR, "stride (%d) is invalid for packet sized %d\n", 68 stride, avpkt->size); 69 return AVERROR_INVALIDDATA; 70 } 71 72 frame->interlaced_frame = ((avctx->extradata[3*4] & 3) != 3); 73 if (frame->interlaced_frame) 74 frame->top_field_first = avctx->extradata[3*4] & 1; 75 76 for (y = 0; y < avctx->height; y++) { 77 int src_y = y; 78 if (frame->interlaced_frame) 79 src_y = ((y&1)^frame->top_field_first) ? y/2 : (y/2 + avctx->height/2); 80 if (bits == 8) { 81 uint8_t *line = frame->data[0] + y*frame->linesize[0]; 82 memcpy(line, buf + src_y*stride, 2*avctx->width); 83 } else { 84 int block; 85 uint16_t *luma = (uint16_t*)&frame->data[0][y*frame->linesize[0]]; 86 uint16_t *cb = (uint16_t*)&frame->data[1][y*frame->linesize[1]]; 87 uint16_t *cr = (uint16_t*)&frame->data[2][y*frame->linesize[2]]; 88 for (block = 0; 16*block < avctx->width; block ++) { 89 const uint8_t *buf_src = buf + src_y*stride + 40*block; 90 for (x = 0; x < 16 && x + 16*block < avctx->width; x++) { 91 int xd = x + 16*block; 92 if (x&1) { 93 luma [xd] = (4*buf_src[2*x + 0]) + ((buf_src[32 + (x>>1)]>>4)&3); 94 } else { 95 luma [xd] = (4*buf_src[2*x + 0]) + (buf_src[32 + (x>>1)] &3); 96 cb[xd>>1] = (4*buf_src[2*x + 1]) + ((buf_src[32 + (x>>1)]>>2)&3); 97 cr[xd>>1] = (4*buf_src[2*x + 3]) + (buf_src[32 + (x>>1)]>>6); 98 } 99 } 100 } 101 } 102 } 103 104 *got_frame = 1; 105 return avpkt->size; 106} 107 108const FFCodec ff_m101_decoder = { 109 .p.name = "m101", 110 .p.long_name = NULL_IF_CONFIG_SMALL("Matrox Uncompressed SD"), 111 .p.type = AVMEDIA_TYPE_VIDEO, 112 .p.id = AV_CODEC_ID_M101, 113 .init = m101_decode_init, 114 FF_CODEC_DECODE_CB(m101_decode_frame), 115 .p.capabilities = AV_CODEC_CAP_DR1, 116 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE, 117}; 118