FFmpeg: libavcodec/ptx.c Source File

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libavcodec

ptx.c

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1 /*

2 * V.Flash PTX (.ptx) image 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 "libavutil/common.h"

23 #include "libavutil/intreadwrite.h"

24 #include "libavutil/imgutils.h"

25 #include "avcodec.h"

26 #include "internal.h"

28 static int ptx_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,

29 AVPacket *avpkt) {

30 const uint8_t *buf = avpkt->data;

31 const uint8_t *buf_end = avpkt->data + avpkt->size;

32 AVFrame * const p = data;

33 unsigned int offset, w, h, y, stride, bytes_per_pixel;

34 int ret;

35 uint8_t *ptr;

37 if (buf_end - buf < 14)

38 return AVERROR_INVALIDDATA;

39 offset = AV_RL16(buf);

40 w = AV_RL16(buf+8);

41 h = AV_RL16(buf+10);

42 bytes_per_pixel = AV_RL16(buf+12) >> 3;

44 if (bytes_per_pixel != 2) {

45 avpriv_request_sample(avctx, "Image format not RGB15");

46 return AVERROR_PATCHWELCOME;

47 }

49 avctx->pix_fmt = AV_PIX_FMT_BGR555LE;

51 if (buf_end - buf < offset)

52 return AVERROR_INVALIDDATA;

53 if (offset != 0x2c)

54 avpriv_request_sample(avctx, "offset != 0x2c");

56 buf += offset;

58 if ((ret = av_image_check_size(w, h, 0, avctx)) < 0)

59 return ret;

60 if (w != avctx->width || h != avctx->height)

61 avcodec_set_dimensions(avctx, w, h);

62 if ((ret = ff_get_buffer(avctx, p, 0)) < 0)

63 return ret;

65 p->pict_type = AV_PICTURE_TYPE_I;

67 ptr = p->data[0];

68 stride = p->linesize[0];

70 for (y = 0; y < h && buf_end - buf >= w * bytes_per_pixel; y++) {

71 memcpy(ptr, buf, w*bytes_per_pixel);

72 ptr += stride;

73 buf += w*bytes_per_pixel;

74 }

76 *got_frame = 1;

78 if (y < h) {

79 av_log(avctx, AV_LOG_WARNING, "incomplete packet\n");

80 return avpkt->size;

81 }

83 return offset + w*h*bytes_per_pixel;

84 }

86 AVCodec ff_ptx_decoder = {

87 .name = "ptx",

88 .type = AVMEDIA_TYPE_VIDEO,

89 .id = AV_CODEC_ID_PTX,

90 .decode = ptx_decode_frame,

91 .capabilities = CODEC_CAP_DR1,

92 .long_name = NULL_IF_CONFIG_SMALL("V.Flash PTX image"),

93 };

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