mirror of
https://github.com/FFmpeg/FFmpeg.git
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110 lines
3.1 KiB
C
110 lines
3.1 KiB
C
/*
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* libquicktime yuv4 decoder
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*
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* Copyright (c) 2011 Carl Eugen Hoyos
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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 "avcodec.h"
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static av_cold int yuv4_decode_init(AVCodecContext *avctx)
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{
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avctx->pix_fmt = PIX_FMT_YUV420P;
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avctx->coded_frame = avcodec_alloc_frame();
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if (!avctx->coded_frame) {
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av_log(avctx, AV_LOG_ERROR, "Could not allocate frame.\n");
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return AVERROR(ENOMEM);
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}
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return 0;
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}
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static int yuv4_decode_frame(AVCodecContext *avctx, void *data,
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int *data_size, AVPacket *avpkt)
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{
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AVFrame *pic = avctx->coded_frame;
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const uint8_t *src = avpkt->data;
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uint8_t *y, *u, *v;
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int i, j;
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if (pic->data[0])
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avctx->release_buffer(avctx, pic);
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if (avpkt->size < 6 * (avctx->width + 1 >> 1) * (avctx->height + 1 >> 1)) {
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av_log(avctx, AV_LOG_ERROR, "Insufficient input data.\n");
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return AVERROR(EINVAL);
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}
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pic->reference = 0;
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if (avctx->get_buffer(avctx, pic) < 0) {
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av_log(avctx, AV_LOG_ERROR, "Could not allocate buffer.\n");
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return AVERROR(ENOMEM);
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}
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pic->key_frame = 1;
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pic->pict_type = AV_PICTURE_TYPE_I;
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y = pic->data[0];
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u = pic->data[1];
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v = pic->data[2];
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for (i = 0; i < (avctx->height + 1) >> 1; i++) {
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for (j = 0; j < (avctx->width + 1) >> 1; j++) {
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u[j] = *src++ ^ 0x80;
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v[j] = *src++ ^ 0x80;
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y[ 2 * j ] = *src++;
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y[ 2 * j + 1] = *src++;
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y[pic->linesize[0] + 2 * j ] = *src++;
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y[pic->linesize[0] + 2 * j + 1] = *src++;
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}
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y += 2 * pic->linesize[0];
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u += pic->linesize[1];
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v += pic->linesize[2];
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}
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*data_size = sizeof(AVFrame);
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*(AVFrame *)data = *pic;
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return avpkt->size;
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}
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static av_cold int yuv4_decode_close(AVCodecContext *avctx)
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{
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if (avctx->coded_frame->data[0])
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avctx->release_buffer(avctx, avctx->coded_frame);
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av_freep(&avctx->coded_frame);
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return 0;
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}
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AVCodec ff_yuv4_decoder = {
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.name = "yuv4",
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.type = AVMEDIA_TYPE_VIDEO,
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.id = CODEC_ID_YUV4,
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.init = yuv4_decode_init,
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.decode = yuv4_decode_frame,
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.close = yuv4_decode_close,
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.capabilities = CODEC_CAP_DR1,
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.long_name = NULL_IF_CONFIG_SMALL("Uncompressed packed 4:2:0"),
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};
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