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92 lines
2.6 KiB
92 lines
2.6 KiB
/* |
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* y41p decoder |
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* |
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* Copyright (c) 2012 Paul B Mahol |
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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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#include "internal.h" |
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static av_cold int y41p_decode_init(AVCodecContext *avctx) |
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{ |
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avctx->pix_fmt = AV_PIX_FMT_YUV411P; |
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avctx->bits_per_raw_sample = 12; |
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if (avctx->width & 7) { |
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av_log(avctx, AV_LOG_WARNING, "y41p requires width to be divisible by 8.\n"); |
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} |
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return 0; |
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} |
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static int y41p_decode_frame(AVCodecContext *avctx, void *data, |
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int *got_frame, AVPacket *avpkt) |
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{ |
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AVFrame *pic = data; |
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uint8_t *src = avpkt->data; |
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uint8_t *y, *u, *v; |
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int i, j, ret; |
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if (avpkt->size < 1.5 * avctx->height * avctx->width) { |
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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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if ((ret = ff_get_buffer(avctx, pic, 0)) < 0) |
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return ret; |
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pic->key_frame = 1; |
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pic->pict_type = AV_PICTURE_TYPE_I; |
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for (i = avctx->height - 1; i >= 0 ; i--) { |
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y = &pic->data[0][i * pic->linesize[0]]; |
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u = &pic->data[1][i * pic->linesize[1]]; |
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v = &pic->data[2][i * pic->linesize[2]]; |
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for (j = 0; j < avctx->width; j += 8) { |
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*(u++) = *src++; |
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*(y++) = *src++; |
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*(v++) = *src++; |
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*(y++) = *src++; |
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*(u++) = *src++; |
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*(y++) = *src++; |
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*(v++) = *src++; |
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*(y++) = *src++; |
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*(y++) = *src++; |
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*(y++) = *src++; |
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*(y++) = *src++; |
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*(y++) = *src++; |
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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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AVCodec ff_y41p_decoder = { |
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.name = "y41p", |
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.type = AVMEDIA_TYPE_VIDEO, |
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.id = AV_CODEC_ID_Y41P, |
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.init = y41p_decode_init, |
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.decode = y41p_decode_frame, |
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.capabilities = CODEC_CAP_DR1, |
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.long_name = NULL_IF_CONFIG_SMALL("Uncompressed YUV 4:1:1 12-bit"), |
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};
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