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86 lines
2.5 KiB
86 lines
2.5 KiB
/* |
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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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#include "codec_internal.h" |
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#include "internal.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 = AV_PIX_FMT_YUV420P; |
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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 *got_frame, AVPacket *avpkt) |
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{ |
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AVFrame *pic = data; |
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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, ret; |
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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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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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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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*got_frame = 1; |
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return avpkt->size; |
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} |
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const FFCodec ff_yuv4_decoder = { |
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.p.name = "yuv4", |
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.p.long_name = NULL_IF_CONFIG_SMALL("Uncompressed packed 4:2:0"), |
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.p.type = AVMEDIA_TYPE_VIDEO, |
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.p.id = AV_CODEC_ID_YUV4, |
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.init = yuv4_decode_init, |
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.decode = yuv4_decode_frame, |
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.p.capabilities = AV_CODEC_CAP_DR1, |
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.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE, |
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};
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