FFmpeg: libavcodec/y41pdec.c Source File

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libavcodec

y41pdec.c

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1 /*

2 * y41p decoder

3 *

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 */

23 #include "avcodec.h"

24 #include "internal.h"

26 static av_cold int y41p_decode_init(AVCodecContext *avctx)

27 {

28 avctx->pix_fmt = AV_PIX_FMT_YUV411P;

29 avctx->bits_per_raw_sample = 12;

31 if (avctx->width & 7) {

32 av_log(avctx, AV_LOG_WARNING, "y41p requires width to be divisible by 8.\n");

33 }

35 return 0;

36 }

38 static int y41p_decode_frame(AVCodecContext *avctx, void *data,

39 int *got_frame, AVPacket *avpkt)

40 {

41 AVFrame *pic = data;

42 uint8_t *src = avpkt->data;

43 uint8_t *y, *u, *v;

44 int i, j, ret;

46 if (avpkt->size < 1.5 * avctx->height * avctx->width) {

47 av_log(avctx, AV_LOG_ERROR, "Insufficient input data.\n");

48 return AVERROR(EINVAL);

49 }

51 if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)

52 return ret;

54 pic->key_frame = 1;

55 pic->pict_type = AV_PICTURE_TYPE_I;

57 for (i = avctx->height - 1; i >= 0 ; i--) {

58 y = &pic->data[0][i * pic->linesize[0]];

59 u = &pic->data[1][i * pic->linesize[1]];

60 v = &pic->data[2][i * pic->linesize[2]];

61 for (j = 0; j < avctx->width; j += 8) {

62 *(u++) = *src++;

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

64 *(v++) = *src++;

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

67 *(u++) = *src++;

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

69 *(v++) = *src++;

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

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

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

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

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

76 }

77 }

79 *got_frame = 1;

81 return avpkt->size;

82 }

84 AVCodec ff_y41p_decoder = {

85 .name = "y41p",

86 .long_name = NULL_IF_CONFIG_SMALL("Uncompressed YUV 4:1:1 12-bit"),

87 .type = AVMEDIA_TYPE_VIDEO,

88 .id = AV_CODEC_ID_Y41P,

89 .init = y41p_decode_init,

90 .decode = y41p_decode_frame,

91 .capabilities = CODEC_CAP_DR1,

92 };

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