avfilter: compress CUDA PTX code if possible

libavfilter/cuda/load_helper.c

@@ -0,0 +1,96 @@
+/*
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "config.h"
+
+#include "libavutil/hwcontext.h"
+#include "libavutil/hwcontext_cuda_internal.h"
+#include "libavutil/cuda_check.h"
+
+#if CONFIG_PTX_COMPRESSION
+#include <zlib.h>
+#define CHUNK_SIZE 1024 * 64
+#endif
+
+#include "load_helper.h"
+
+#define CHECK_CU(x) FF_CUDA_CHECK_DL(avctx, cu, x)
+
+int ff_cuda_load_module(void *avctx, AVCUDADeviceContext *hwctx, CUmodule *cu_module,
+                        const unsigned char *data, const unsigned int length)
+{
+    CudaFunctions *cu = hwctx->internal->cuda_dl;
+
+#if CONFIG_PTX_COMPRESSION
+    z_stream stream = { 0 };
+    uint8_t *buf, *tmp;
+    uint64_t buf_size;
+    int ret;
+
+    if (inflateInit2(&stream, 32 + 15) != Z_OK) {
+        av_log(avctx, AV_LOG_ERROR, "Error during zlib initialisation: %s\n", stream.msg);
+        return AVERROR(ENOSYS);
+    }
+
+    buf_size = CHUNK_SIZE * 4;
+    buf = av_realloc(NULL, buf_size);
+    if (!buf) {
+        inflateEnd(&stream);
+        return AVERROR(ENOMEM);
+    }
+
+    stream.next_in = data;
+    stream.avail_in = length;
+
+    do {
+        stream.avail_out = buf_size - stream.total_out;
+        stream.next_out = buf + stream.total_out;
+
+        ret = inflate(&stream, Z_FINISH);
+        if (ret != Z_OK && ret != Z_STREAM_END) {
+            av_log(avctx, AV_LOG_ERROR, "zlib inflate error: %s\n", stream.msg);
+            inflateEnd(&stream);
+            av_free(buf);
+            return AVERROR(EINVAL);
+        }
+
+        if (stream.avail_out == 0) {
+            buf_size += CHUNK_SIZE;
+            tmp = av_realloc(buf, buf_size);
+            if (!tmp) {
+                inflateEnd(&stream);
+                av_free(buf);
+                return AVERROR(ENOMEM);
+            }
+            buf = tmp;
+        }
+    } while (ret != Z_STREAM_END);
+
+    // NULL-terminate string
+    // there is guaranteed to be space for this, due to condition in loop
+    buf[stream.total_out] = 0;
+
+    inflateEnd(&stream);
+
+    ret = CHECK_CU(cu->cuModuleLoadData(cu_module, buf));
+    av_free(buf);
+    return ret;
+#else
+    return CHECK_CU(cu->cuModuleLoadData(cu_module, data));
+#endif
+}

libavfilter/cuda/load_helper.h

@@ -0,0 +1,28 @@
+/*
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef AVFILTER_CUDA_DECOMPRESS_H
+#define AVFILTER_CUDA_DECOMPRESS_H
+
+/**
+ * Loads a CUDA module and applies any decompression, if neccesary.
+ */
+int ff_cuda_load_module(void *avctx, AVCUDADeviceContext *hwctx, CUmodule *cu_module,
+                        const unsigned char *data, const unsigned int length);
+
+#endif