FFmpeg: libavfilter/cuda/load_helper.c Source File

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load_helper.c

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1 /*

2 * This file is part of FFmpeg.

3 *

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

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

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

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

8 *

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

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

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

12 * Lesser General Public License for more details.

13 *

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

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

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

17 */

19 #include "config.h"

21 #include "libavutil/hwcontext.h"

22 #include "libavutil/hwcontext_cuda_internal.h"

23 #include "libavutil/cuda_check.h"

25 #if CONFIG_PTX_COMPRESSION

26 #include <zlib.h>

27 #define CHUNK_SIZE 1024 * 64

28 #endif

30 #include "load_helper.h"

32 #define CHECK_CU(x) FF_CUDA_CHECK_DL(avctx, cu, x)

34 int ff_cuda_load_module(void *avctx, AVCUDADeviceContext *hwctx, CUmodule *cu_module,

35 const unsigned char *data, const unsigned int length)

36 {

37 CudaFunctions *cu = hwctx->internal->cuda_dl;

39 #if CONFIG_PTX_COMPRESSION

40 z_stream stream = { 0 };

41 uint8_t *buf, *tmp;

42 uint64_t buf_size;

43 int ret;

45 if (inflateInit2(&stream, 32 + 15) != Z_OK) {

46 av_log(avctx, AV_LOG_ERROR, "Error during zlib initialisation: %s\n", stream.msg);

47 return AVERROR(ENOSYS);

48 }

50 buf_size = CHUNK_SIZE * 4;

51 buf = av_realloc(NULL, buf_size);

52 if (!buf) {

53 inflateEnd(&stream);

54 return AVERROR(ENOMEM);

55 }

57 stream.next_in = data;

58 stream.avail_in = length;

60 do {

61 stream.avail_out = buf_size - stream.total_out;

62 stream.next_out = buf + stream.total_out;

64 ret = inflate(&stream, Z_FINISH);

65 if (ret != Z_OK && ret != Z_STREAM_END && ret != Z_BUF_ERROR) {

66 av_log(avctx, AV_LOG_ERROR, "zlib inflate error(%d): %s\n", ret, stream.msg);

67 inflateEnd(&stream);

68 av_free(buf);

69 return AVERROR(EINVAL);

70 }

72 if (stream.avail_out == 0) {

73 buf_size += CHUNK_SIZE;

74 tmp = av_realloc(buf, buf_size);

75 if (!tmp) {

76 inflateEnd(&stream);

77 av_free(buf);

78 return AVERROR(ENOMEM);

79 }

80 buf = tmp;

81 }

82 } while (ret != Z_STREAM_END);

84 // NULL-terminate string

85 // there is guaranteed to be space for this, due to condition in loop

86 buf[stream.total_out] = 0;

88 inflateEnd(&stream);

90 ret = CHECK_CU(cu->cuModuleLoadData(cu_module, buf));

91 av_free(buf);

92 return ret;

93 #else

94 return CHECK_CU(cu->cuModuleLoadData(cu_module, data));

95 #endif

96 }

AVERROR

Filter the word "frame" indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions

hwcontext_cuda_internal.h

CHUNK_SIZE

#define CHUNK_SIZE

Definition: act.c:29

ff_cuda_load_module

int ff_cuda_load_module(void *avctx, AVCUDADeviceContext *hwctx, CUmodule *cu_module, const unsigned char *data, const unsigned int length)

Loads a CUDA module and applies any decompression, if necessary.

Definition: load_helper.c:34

tmp

static uint8_t tmp[11]

Definition: aes_ctr.c:28

data