FFmpeg: libavcodec/v210x.c Source File

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libavcodec

v210x.c

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1 /*

3 *

4 * This file is part of FFmpeg.

5 *

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

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

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

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

10 *

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

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

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

14 * Lesser General Public License for more details.

15 *

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

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

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

19 */

21 #include "avcodec.h"

22 #include "internal.h"

23 #include "libavutil/bswap.h"

24 #include "libavutil/internal.h"

25 #include "libavutil/mem.h"

27 static av_cold int decode_init(AVCodecContext *avctx)

28 {

29 if (avctx->width & 1) {

30 av_log(avctx, AV_LOG_ERROR, "v210x needs even width\n");

31 return AVERROR(EINVAL);

32 }

33 avctx->pix_fmt = AV_PIX_FMT_YUV422P16;

34 avctx->bits_per_raw_sample = 10;

36 return 0;

37 }

39 static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,

40 AVPacket *avpkt)

41 {

42 const uint32_t *src = (const uint32_t *)avpkt->data;

43 AVFrame *pic = data;

44 int width = avctx->width;

45 int y = 0;

46 uint16_t *ydst, *udst, *vdst, *yend;

47 int ret;

49 if (avpkt->size < avctx->width * avctx->height * 8 / 3) {

50 av_log(avctx, AV_LOG_ERROR, "Packet too small\n");

51 return AVERROR_INVALIDDATA;

52 }

54 if (avpkt->size > avctx->width * avctx->height * 8 / 3) {

55 avpriv_request_sample(avctx, "(Probably) padded data");

56 }

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

59 return ret;

61 ydst = (uint16_t *)pic->data[0];

62 udst = (uint16_t *)pic->data[1];

63 vdst = (uint16_t *)pic->data[2];

64 yend = ydst + width;

65 pic->pict_type = AV_PICTURE_TYPE_I;

66 pic->key_frame = 1;

68 for (;;) {

69 uint32_t v = av_be2ne32(*src++);

70 *udst++ = (v >> 16) & 0xFFC0;

71 *ydst++ = (v >> 6 ) & 0xFFC0;

72 *vdst++ = (v << 4 ) & 0xFFC0;

74 v = av_be2ne32(*src++);

75 *ydst++ = (v >> 16) & 0xFFC0;

77 if (ydst >= yend) {

78 ydst += pic->linesize[0] / 2 - width;

79 udst += pic->linesize[1] / 2 - width / 2;

80 vdst += pic->linesize[2] / 2 - width / 2;

81 yend = ydst + width;

82 if (++y >= avctx->height)

83 break;

84 }

86 *udst++ = (v >> 6 ) & 0xFFC0;

87 *ydst++ = (v << 4 ) & 0xFFC0;

89 v = av_be2ne32(*src++);

90 *vdst++ = (v >> 16) & 0xFFC0;

91 *ydst++ = (v >> 6 ) & 0xFFC0;

93 if (ydst >= yend) {

94 ydst += pic->linesize[0] / 2 - width;

95 udst += pic->linesize[1] / 2 - width / 2;

96 vdst += pic->linesize[2] / 2 - width / 2;

97 yend = ydst + width;

98 if (++y >= avctx->height)

99 break;

100 }

101

102 *udst++ = (v << 4 ) & 0xFFC0;

103

104 v = av_be2ne32(*src++);

105 *ydst++ = (v >> 16) & 0xFFC0;

106 *vdst++ = (v >> 6 ) & 0xFFC0;

107 *ydst++ = (v << 4 ) & 0xFFC0;

108 if (ydst >= yend) {

109 ydst += pic->linesize[0] / 2 - width;

110 udst += pic->linesize[1] / 2 - width / 2;

111 vdst += pic->linesize[2] / 2 - width / 2;

112 yend = ydst + width;

113 if (++y >= avctx->height)

114 break;

115 }

116 }

117

118 *got_frame = 1;

119

120 return avpkt->size;

121 }

122

123 AVCodec ff_v210x_decoder = {

124 .name = "v210x",

125 .type = AVMEDIA_TYPE_VIDEO,

126 .id = AV_CODEC_ID_V210X,

127 .init = decode_init,

128 .decode = decode_frame,

129 .capabilities = CODEC_CAP_DR1,

130 .long_name = NULL_IF_CONFIG_SMALL("Uncompressed 4:2:2 10-bit"),

131 };

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