FFmpeg: libavcodec/v408dec.c Source File

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libavcodec

v408dec.c

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1 /*

2 * v408 decoder

4 *

5 * This file is part of FFmpeg.

6 *

7 * FFmpeg is free software; you can redistribute it and/or

8 * modify it under the terms of the GNU Lesser General Public

9 * License as published by the Free Software Foundation; either

10 * version 2.1 of the License, or (at your option) any later version.

11 *

12 * FFmpeg is distributed in the hope that it will be useful,

13 * but WITHOUT ANY WARRANTY; without even the implied warranty of

14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

15 * Lesser General Public License for more details.

16 *

17 * You should have received a copy of the GNU Lesser General Public

18 * License along with FFmpeg; if not, write to the Free Software

19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

20 */

22 #include "avcodec.h"

23 #include "internal.h"

25 static av_cold int v408_decode_init(AVCodecContext *avctx)

26 {

27 avctx->pix_fmt = AV_PIX_FMT_YUVA444P;

29 return 0;

30 }

32 static int v408_decode_frame(AVCodecContext *avctx, void *data,

33 int *got_frame, AVPacket *avpkt)

34 {

35 AVFrame *pic = data;

36 const uint8_t *src = avpkt->data;

37 uint8_t *y, *u, *v, *a;

38 int i, j, ret;

40 if (avpkt->size < 4 * avctx->height * avctx->width) {

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

42 return AVERROR(EINVAL);

43 }

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

46 return ret;

48 pic->key_frame = 1;

49 pic->pict_type = AV_PICTURE_TYPE_I;

51 y = pic->data[0];

52 u = pic->data[1];

53 v = pic->data[2];

54 a = pic->data[3];

56 for (i = 0; i < avctx->height; i++) {

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

58 if (avctx->codec_id==AV_CODEC_ID_AYUV) {

59 v[j] = *src++;

60 u[j] = *src++;

61 y[j] = *src++;

62 a[j] = *src++;

63 } else {

64 u[j] = *src++;

65 y[j] = *src++;

66 v[j] = *src++;

67 a[j] = *src++;

68 }

69 }

71 y += pic->linesize[0];

72 u += pic->linesize[1];

73 v += pic->linesize[2];

74 a += pic->linesize[3];

75 }

77 *got_frame = 1;

79 return avpkt->size;

80 }

82 #if CONFIG_AYUV_DECODER

83 AVCodec ff_ayuv_decoder = {

84 .name = "ayuv",

85 .long_name = NULL_IF_CONFIG_SMALL("Uncompressed packed MS 4:4:4:4"),

86 .type = AVMEDIA_TYPE_VIDEO,

87 .id = AV_CODEC_ID_AYUV,

88 .init = v408_decode_init,

89 .decode = v408_decode_frame,

90 .capabilities = CODEC_CAP_DR1,

91 };

92 #endif

93 #if CONFIG_V408_DECODER

94 AVCodec ff_v408_decoder = {

95 .name = "v408",

96 .long_name = NULL_IF_CONFIG_SMALL("Uncompressed packed QT 4:4:4:4"),

97 .type = AVMEDIA_TYPE_VIDEO,

98 .id = AV_CODEC_ID_V408,

99 .init = v408_decode_init,

100 .decode = v408_decode_frame,

101 .capabilities = CODEC_CAP_DR1,

102 };

103 #endif

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