FFmpeg: libavcodec/v308dec.c Source File

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libavcodec

v308dec.c

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1 /*

2 * v308 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 v308_decode_init(AVCodecContext *avctx)

26 {

27 avctx->pix_fmt = AV_PIX_FMT_YUV444P;

29 if (avctx->width & 1)

30 av_log(avctx, AV_LOG_WARNING, "v308 requires width to be even.\n");

32 return 0;

33 }

35 static int v308_decode_frame(AVCodecContext *avctx, void *data,

36 int *got_frame, AVPacket *avpkt)

37 {

38 AVFrame *pic = data;

39 const uint8_t *src = avpkt->data;

40 uint8_t *y, *u, *v;

41 int i, j, ret;

43 if (avpkt->size < 3 * avctx->height * avctx->width) {

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

45 return AVERROR(EINVAL);

46 }

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

49 return ret;

51 pic->key_frame = 1;

52 pic->pict_type = AV_PICTURE_TYPE_I;

54 y = pic->data[0];

55 u = pic->data[1];

56 v = pic->data[2];

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

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

60 v[j] = *src++;

61 y[j] = *src++;

62 u[j] = *src++;

63 }

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

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

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

68 }

70 *got_frame = 1;

72 return avpkt->size;

73 }

75 AVCodec ff_v308_decoder = {

76 .name = "v308",

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

78 .type = AVMEDIA_TYPE_VIDEO,

79 .id = AV_CODEC_ID_V308,

80 .init = v308_decode_init,

81 .decode = v308_decode_frame,

82 .capabilities = CODEC_CAP_DR1,

83 };

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