FFmpeg: libavcodec/y41penc.c Source File

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libavcodec

y41penc.c

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1 /*

2 * y41p encoder

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_encode_init(AVCodecContext *avctx)

27 {

28 if (avctx->width & 7) {

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

30 return AVERROR_INVALIDDATA;

31 }

33 avctx->coded_frame = av_frame_alloc();

34 avctx->bits_per_coded_sample = 12;

36 if (!avctx->coded_frame) {

37 av_log(avctx, AV_LOG_ERROR, "Could not allocate frame.\n");

38 return AVERROR(ENOMEM);

39 }

41 return 0;

42 }

44 static int y41p_encode_frame(AVCodecContext *avctx, AVPacket *pkt,

45 const AVFrame *pic, int *got_packet)

46 {

47 uint8_t *dst;

48 uint8_t *y, *u, *v;

49 int i, j, ret;

51 if ((ret = ff_alloc_packet2(avctx, pkt, avctx->width * avctx->height * 1.5)) < 0)

52 return ret;

54 avctx->coded_frame->key_frame = 1;

55 avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;

56 dst = pkt->data;

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

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

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

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

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

63 *(dst++) = *(u++);

64 *(dst++) = *(y++);

65 *(dst++) = *(v++);

66 *(dst++) = *(y++);

68 *(dst++) = *(u++);

69 *(dst++) = *(y++);

70 *(dst++) = *(v++);

71 *(dst++) = *(y++);

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

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

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

76 *(dst++) = *(y++);

77 }

78 }

80 pkt->flags |= AV_PKT_FLAG_KEY;

81 *got_packet = 1;

82 return 0;

83 }

85 static av_cold int y41p_encode_close(AVCodecContext *avctx)

86 {

87 av_frame_free(&avctx->coded_frame);

89 return 0;

90 }

92 AVCodec ff_y41p_encoder = {

93 .name = "y41p",

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

95 .type = AVMEDIA_TYPE_VIDEO,

96 .id = AV_CODEC_ID_Y41P,

97 .init = y41p_encode_init,

98 .encode2 = y41p_encode_frame,

99 .close = y41p_encode_close,

100 .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV411P,

101 AV_PIX_FMT_NONE },

102 };

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