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115 lines
4.1 KiB
115 lines
4.1 KiB
/* |
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* Copyright (c) 2016 Michael Niedermayer |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include "libavutil/intreadwrite.h" |
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#include "avcodec.h" |
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#include "codec_internal.h" |
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#include "decode.h" |
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static av_cold int m101_decode_init(AVCodecContext *avctx) |
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{ |
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if (avctx->extradata_size < 6*4) { |
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avpriv_request_sample(avctx, "Missing or too small extradata (size %d)", avctx->extradata_size); |
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return AVERROR_INVALIDDATA; |
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} |
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if (avctx->extradata[2*4] == 10) |
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avctx->pix_fmt = AV_PIX_FMT_YUV422P10; |
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else if (avctx->extradata[2*4] == 8) { |
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avctx->pix_fmt = AV_PIX_FMT_YUYV422; |
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} else { |
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avpriv_request_sample(avctx, "BPS %d", avctx->extradata[2*4]); |
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return AVERROR_INVALIDDATA; |
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} |
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return 0; |
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} |
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static int m101_decode_frame(AVCodecContext *avctx, AVFrame *frame, |
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int *got_frame, AVPacket *avpkt) |
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{ |
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const uint8_t *buf = avpkt->data; |
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int stride, ret; |
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int x, y; |
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int min_stride = 2 * avctx->width; |
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int bits = avctx->extradata[2*4]; |
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stride = AV_RL32(avctx->extradata + 5*4); |
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if (avctx->pix_fmt == AV_PIX_FMT_YUV422P10) |
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min_stride = (avctx->width + 15) / 16 * 40; |
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if (stride < min_stride || avpkt->size < stride * (uint64_t)avctx->height) { |
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av_log(avctx, AV_LOG_ERROR, "stride (%d) is invalid for packet sized %d\n", |
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stride, avpkt->size); |
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return AVERROR_INVALIDDATA; |
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} |
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if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) |
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return ret; |
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frame->pict_type = AV_PICTURE_TYPE_I; |
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frame->key_frame = 1; |
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frame->interlaced_frame = ((avctx->extradata[3*4] & 3) != 3); |
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if (frame->interlaced_frame) |
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frame->top_field_first = avctx->extradata[3*4] & 1; |
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for (y = 0; y < avctx->height; y++) { |
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int src_y = y; |
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if (frame->interlaced_frame) |
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src_y = ((y&1)^frame->top_field_first) ? y/2 : (y/2 + avctx->height/2); |
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if (bits == 8) { |
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uint8_t *line = frame->data[0] + y*frame->linesize[0]; |
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memcpy(line, buf + src_y*stride, 2*avctx->width); |
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} else { |
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int block; |
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uint16_t *luma = (uint16_t*)&frame->data[0][y*frame->linesize[0]]; |
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uint16_t *cb = (uint16_t*)&frame->data[1][y*frame->linesize[1]]; |
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uint16_t *cr = (uint16_t*)&frame->data[2][y*frame->linesize[2]]; |
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for (block = 0; 16*block < avctx->width; block ++) { |
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const uint8_t *buf_src = buf + src_y*stride + 40*block; |
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for (x = 0; x < 16 && x + 16*block < avctx->width; x++) { |
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int xd = x + 16*block; |
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if (x&1) { |
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luma [xd] = (4*buf_src[2*x + 0]) + ((buf_src[32 + (x>>1)]>>4)&3); |
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} else { |
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luma [xd] = (4*buf_src[2*x + 0]) + (buf_src[32 + (x>>1)] &3); |
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cb[xd>>1] = (4*buf_src[2*x + 1]) + ((buf_src[32 + (x>>1)]>>2)&3); |
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cr[xd>>1] = (4*buf_src[2*x + 3]) + (buf_src[32 + (x>>1)]>>6); |
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} |
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} |
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} |
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} |
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} |
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*got_frame = 1; |
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return avpkt->size; |
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} |
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const FFCodec ff_m101_decoder = { |
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.p.name = "m101", |
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CODEC_LONG_NAME("Matrox Uncompressed SD"), |
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.p.type = AVMEDIA_TYPE_VIDEO, |
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.p.id = AV_CODEC_ID_M101, |
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.init = m101_decode_init, |
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FF_CODEC_DECODE_CB(m101_decode_frame), |
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.p.capabilities = AV_CODEC_CAP_DR1, |
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};
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