FFmpeg: libavcodec/wbmpenc.c Source File

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libavcodec

wbmpenc.c

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1 /*

2 * WBMP (Wireless Application Protocol Bitmap) image

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 "bytestream.h"

23 #include "codec_internal.h"

24 #include "encode.h"

26 static void putv(uint8_t ** bufp, unsigned int v)

27 {

28 unsigned int vv = 0;

29 int n = 0;

31 while (vv != v)

32 vv += v & (0x7F << 7 * n++);

34 while (--n > 0)

35 bytestream_put_byte(bufp, 0x80 | (v & (0x7F << 7 * n)) >> 7 * n);

37 bytestream_put_byte(bufp, v & 0x7F);

38 }

40 static void writebits(uint8_t ** bufp, const uint8_t * src, int width, int height, int linesize)

41 {

42 int wpad = (width + 7) / 8;

43 for (int j = 0; j < height; j++) {

44 memcpy(*bufp, src, wpad);

45 *bufp += wpad;

46 src += linesize;

47 }

48 }

50 static int wbmp_encode_frame(AVCodecContext *avctx, AVPacket *pkt,

51 const AVFrame *frame, int *got_packet)

52 {

53 int64_t size = avctx->height * ((avctx->width + 7) / 8) + 32;

54 uint8_t *buf;

55 int ret;

57 if ((ret = ff_get_encode_buffer(avctx, pkt, size, 0)) < 0)

58 return ret;

60 buf = pkt->data;

62 putv(&buf, 0);

63 bytestream_put_byte(&buf, 0);

64 putv(&buf, avctx->width);

65 putv(&buf, avctx->height);

67 if (frame->linesize[0] == (avctx->width + 7) / 8)

68 bytestream_put_buffer(&buf, frame->data[0], avctx->height * ((avctx->width + 7) / 8));

69 else

70 writebits(&buf, frame->data[0], avctx->width, avctx->height, frame->linesize[0]);

72 av_shrink_packet(pkt, buf - pkt->data);

74 *got_packet = 1;

75 return 0;

76 }

78 const FFCodec ff_wbmp_encoder = {

79 .p.name = "wbmp",

80 CODEC_LONG_NAME("WBMP (Wireless Application Protocol Bitmap) image"),

81 .p.type = AVMEDIA_TYPE_VIDEO,

82 .p.id = AV_CODEC_ID_WBMP,

83 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS |

84 AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE,

85 FF_CODEC_ENCODE_CB(wbmp_encode_frame),

86 .p.pix_fmts = (const enum AVPixelFormat[]){

87 AV_PIX_FMT_MONOBLACK,

88 AV_PIX_FMT_NONE

89 },

90 };

AVPixelFormat

Pixel format.

Definition: pixfmt.h:71

wbmp_encode_frame

static int wbmp_encode_frame(AVCodecContext *avctx, AVPacket *pkt, const AVFrame *frame, int *got_packet)

Definition: wbmpenc.c:50

int64_t

long long int64_t

Definition: coverity.c:34

AVFrame

This structure describes decoded (raw) audio or video data.

Definition: frame.h:344

AVPacket::data

uint8_t * data

Definition: packet.h:522

encode.h

FFCodec

Definition: codec_internal.h:127

AVFrame::data

uint8_t * data[AV_NUM_DATA_POINTERS]

pointer to the picture/channel planes.

Definition: frame.h:365

FFCodec::p

AVCodec p

The public AVCodec.

Definition: codec_internal.h:131

av_shrink_packet

void av_shrink_packet(AVPacket *pkt, int size)

Reduce packet size, correctly zeroing padding.

Definition: avpacket.c:113

FF_CODEC_ENCODE_CB

#define FF_CODEC_ENCODE_CB(func)

Definition: codec_internal.h:296

pkt

AVPacket * pkt

Definition: movenc.c:59

width

#define width

AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE

#define AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE

This encoder can reorder user opaque values from input AVFrames and return them with corresponding ou...

Definition: codec.h:159

CODEC_LONG_NAME

#define CODEC_LONG_NAME(str)

Definition: codec_internal.h:272

frame

static AVFrame * frame

Definition: demux_decode.c:54

AV_CODEC_CAP_FRAME_THREADS

#define AV_CODEC_CAP_FRAME_THREADS

Codec supports frame-level multithreading.

Definition: codec.h:110

AV_PIX_FMT_MONOBLACK

@ AV_PIX_FMT_MONOBLACK

Y , 1bpp, 0 is black, 1 is white, in each byte pixels are ordered from the msb to the lsb.

Definition: pixfmt.h:83

putv

static void putv(uint8_t **bufp, unsigned int v)

Definition: wbmpenc.c:26

AV_CODEC_CAP_DR1

#define AV_CODEC_CAP_DR1

Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators.

Definition: codec.h:52

codec_internal.h

size

int size

Definition: twinvq_data.h:10344

height

#define height

bytestream_put_buffer

static av_always_inline void bytestream_put_buffer(uint8_t **b, const uint8_t *src, unsigned int size)

Definition: bytestream.h:372

AVCodec::name

const char * name

Name of the codec implementation.

Definition: codec.h:194

AVCodecContext::height

int height

Definition: avcodec.h:618

avcodec.h

ret

Definition: filter_design.txt:187

AVCodecContext

main external API structure.

Definition: avcodec.h:445

ff_get_encode_buffer

int ff_get_encode_buffer(AVCodecContext *avctx, AVPacket *avpkt, int64_t size, int flags)

Get a buffer for a packet.

Definition: encode.c:105

AV_PIX_FMT_NONE

@ AV_PIX_FMT_NONE

Definition: pixfmt.h:72

AV_CODEC_ID_WBMP

@ AV_CODEC_ID_WBMP

Definition: codec_id.h:317

AVMEDIA_TYPE_VIDEO

@ AVMEDIA_TYPE_VIDEO

Definition: avutil.h:201

AVPacket

This structure stores compressed data.

Definition: packet.h:499

ff_wbmp_encoder

const FFCodec ff_wbmp_encoder

Definition: wbmpenc.c:78

src

INIT_CLIP pixel * src

Definition: h264pred_template.c:418

AVCodecContext::width

int width

picture width / height.

Definition: avcodec.h:618

bytestream.h

AVFrame::linesize

int linesize[AV_NUM_DATA_POINTERS]

For video, a positive or negative value, which is typically indicating the size in bytes of each pict...

Definition: frame.h:389

writebits

static void writebits(uint8_t **bufp, const uint8_t *src, int width, int height, int linesize)

Definition: wbmpenc.c:40

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