/src/ffmpeg/libavcodec/y41pdec.c

Source
/*
 * y41p decoder
 *
 * Copyright (c) 2012 Paul B Mahol
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include "avcodec.h"
#include "codec_internal.h"
#include "decode.h"

static av_cold int y41p_decode_init(AVCodecContext *avctx)
{
    avctx->pix_fmt             = AV_PIX_FMT_YUV411P;
    avctx->bits_per_raw_sample = 12;

    if (avctx->width & 7) {
        av_log(avctx, AV_LOG_WARNING, "y41p requires width to be divisible by 8.\n");
    }

    return 0;
}

static int y41p_decode_frame(AVCodecContext *avctx, AVFrame *pic,
                             int *got_frame, AVPacket *avpkt)
{
    const uint8_t *src = avpkt->data;
    uint8_t *y, *u, *v;
    int i, j, ret;

    if (avpkt->size < 3LL * avctx->height * FFALIGN(avctx->width, 8) / 2) {
        av_log(avctx, AV_LOG_ERROR, "Insufficient input data.\n");
        return AVERROR(EINVAL);
    }

    if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
        return ret;

    for (i = avctx->height - 1; i >= 0 ; i--) {
        y = &pic->data[0][i * pic->linesize[0]];
        u = &pic->data[1][i * pic->linesize[1]];
        v = &pic->data[2][i * pic->linesize[2]];
        for (j = 0; j < avctx->width; j += 8) {
            *(u++) = *src++;
            *(y++) = *src++;
            *(v++) = *src++;
            *(y++) = *src++;

            *(u++) = *src++;
            *(y++) = *src++;
            *(v++) = *src++;
            *(y++) = *src++;

            *(y++) = *src++;
            *(y++) = *src++;
            *(y++) = *src++;
            *(y++) = *src++;
        }
    }

    *got_frame = 1;

    return avpkt->size;
}

const FFCodec ff_y41p_decoder = {
    .p.name       = "y41p",
    CODEC_LONG_NAME("Uncompressed YUV 4:1:1 12-bit"),
    .p.type       = AVMEDIA_TYPE_VIDEO,
    .p.id         = AV_CODEC_ID_Y41P,
    .init         = y41p_decode_init,
    FF_CODEC_DECODE_CB(y41p_decode_frame),
    .p.capabilities = AV_CODEC_CAP_DR1,
};

Line	Count	Source
1		/*
2		* y41p decoder
3		*
4		* Copyright (c) 2012 Paul B Mahol
5		*
6		* This file is part of FFmpeg.
7		*
8		* FFmpeg is free software; you can redistribute it and/or
9		* modify it under the terms of the GNU Lesser General Public
10		* License as published by the Free Software Foundation; either
11		* version 2.1 of the License, or (at your option) any later version.
12		*
13		* FFmpeg is distributed in the hope that it will be useful,
14		* but WITHOUT ANY WARRANTY; without even the implied warranty of
15		* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16		* Lesser General Public License for more details.
17		*
18		* You should have received a copy of the GNU Lesser General Public
19		* License along with FFmpeg; if not, write to the Free Software
20		* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21		*/
22
23		#include "avcodec.h"
24		#include "codec_internal.h"
25		#include "decode.h"
26
27		static av_cold int y41p_decode_init(AVCodecContext *avctx)
28	723	{
29	723	avctx->pix_fmt = AV_PIX_FMT_YUV411P;
30	723	avctx->bits_per_raw_sample = 12;
31
32	723	if (avctx->width & 7) {
33	277	av_log(avctx, AV_LOG_WARNING, "y41p requires width to be divisible by 8.\n");
34	277	}
35
36	723	return 0;
37	723	}
38
39		static int y41p_decode_frame(AVCodecContext avctx, AVFrame pic,
40		int got_frame, AVPacket avpkt)
41	594k	{
42	594k	const uint8_t *src = avpkt->data;
43	594k	uint8_t y, u, *v;
44	594k	int i, j, ret;
45
46	594k	if (avpkt->size < 3LL * avctx->height * FFALIGN(avctx->width, 8) / 2) {
47	462k	av_log(avctx, AV_LOG_ERROR, "Insufficient input data.\n");
48	462k	return AVERROR(EINVAL);
49	462k	}
50
51	132k	if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
52	21.2k	return ret;
53
54	342k	for (i = avctx->height - 1; i >= 0 ; i--) {
55	231k	y = &pic->data[0][i * pic->linesize[0]];
56	231k	u = &pic->data[1][i * pic->linesize[1]];
57	231k	v = &pic->data[2][i * pic->linesize[2]];
58	833k	for (j = 0; j < avctx->width; j += 8) {
59	602k	(u++) = src++;
60	602k	(y++) = src++;
61	602k	(v++) = src++;
62	602k	(y++) = src++;
63
64	602k	(u++) = src++;
65	602k	(y++) = src++;
66	602k	(v++) = src++;
67	602k	(y++) = src++;
68
69	602k	(y++) = src++;
70	602k	(y++) = src++;
71	602k	(y++) = src++;
72	602k	(y++) = src++;
73	602k	}
74	231k	}
75
76	111k	*got_frame = 1;
77
78	111k	return avpkt->size;
79	132k	}
80
81		const FFCodec ff_y41p_decoder = {
82		.p.name = "y41p",
83		CODEC_LONG_NAME("Uncompressed YUV 4:1:1 12-bit"),
84		.p.type = AVMEDIA_TYPE_VIDEO,
85		.p.id = AV_CODEC_ID_Y41P,
86		.init = y41p_decode_init,
87		FF_CODEC_DECODE_CB(y41p_decode_frame),
88		.p.capabilities = AV_CODEC_CAP_DR1,
89		};

Coverage Report

Created: 2025-11-16 07:20