Removing examples code generation and making them static.
All documentation will be provided as comments in the source files.
Change-Id: Ie609852747733c181191f864204c787a6b23ef3a
diff --git a/examples/simple_decoder.c b/examples/simple_decoder.c
new file mode 100644
index 0000000..17a5987
--- /dev/null
+++ b/examples/simple_decoder.c
@@ -0,0 +1,186 @@
+/*
+ * Copyright (c) 2010 The WebM project authors. All Rights Reserved.
+ *
+ * Use of this source code is governed by a BSD-style license
+ * that can be found in the LICENSE file in the root of the source
+ * tree. An additional intellectual property rights grant can be found
+ * in the file PATENTS. All contributing project authors may
+ * be found in the AUTHORS file in the root of the source tree.
+ */
+
+
+// Simple Decoder
+// ==============
+//
+// This is an example of a simple decoder loop. It takes an input file
+// containing the compressed data (in IVF format), passes it through the
+// decoder, and writes the decompressed frames to disk. Other decoder
+// examples build upon this one.
+//
+// The details of the IVF format have been elided from this example for
+// simplicity of presentation, as IVF files will not generally be used by
+// your application. In general, an IVF file consists of a file header,
+// followed by a variable number of frames. Each frame consists of a frame
+// header followed by a variable length payload. The length of the payload
+// is specified in the first four bytes of the frame header. The payload is
+// the raw compressed data.
+//
+// Standard Includes
+// -----------------
+// For decoders, you only have to include `vpx_decoder.h` and then any
+// header files for the specific codecs you use. In this case, we're using
+// vp8. The `VPX_CODEC_DISABLE_COMPAT` macro can be defined to ensure
+// strict compliance with the latest SDK by disabling some backwards
+// compatibility features. Defining this macro is encouraged.
+//
+// Initializing The Codec
+// ----------------------
+// The decoder is initialized by the following code. This is an example for
+// the VP8 decoder, but the code is analogous for all algorithms. Replace
+// `vpx_codec_vp8_dx()` with a pointer to the interface exposed by the
+// algorithm you want to use. The `cfg` argument is left as NULL in this
+// example, because we want the algorithm to determine the stream
+// configuration (width/height) and allocate memory automatically. This
+// parameter is generally only used if you need to preallocate memory,
+// particularly in External Memory Allocation mode.
+//
+// Decoding A Frame
+// ----------------
+// Once the frame has been read into memory, it is decoded using the
+// `vpx_codec_decode` function. The call takes a pointer to the data
+// (`frame`) and the length of the data (`frame_sz`). No application data
+// is associated with the frame in this example, so the `user_priv`
+// parameter is NULL. The `deadline` parameter is left at zero for this
+// example. This parameter is generally only used when doing adaptive
+// postprocessing.
+//
+// Codecs may produce a variable number of output frames for every call to
+// `vpx_codec_decode`. These frames are retrieved by the
+// `vpx_codec_get_frame` iterator function. The iterator variable `iter` is
+// initialized to NULL each time `vpx_codec_decode` is called.
+// `vpx_codec_get_frame` is called in a loop, returning a pointer to a
+// decoded image or NULL to indicate the end of list.
+//
+// Processing The Decoded Data
+// ---------------------------
+// In this example, we simply write the encoded data to disk. It is
+// important to honor the image's `stride` values.
+//
+// Cleanup
+// -------
+// The `vpx_codec_destroy` call frees any memory allocated by the codec.
+//
+// Error Handling
+// --------------
+// This example does not special case any error return codes. If there was
+// an error, a descriptive message is printed and the program exits. With
+// few exeptions, vpx_codec functions return an enumerated error status,
+// with the value `0` indicating success.
+
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#define VPX_CODEC_DISABLE_COMPAT 1
+#include "./vpx_config.h"
+#include "vpx/vp8dx.h"
+#include "vpx/vpx_decoder.h"
+#define interface (vpx_codec_vp8_dx())
+
+
+#define IVF_FILE_HDR_SZ (32)
+#define IVF_FRAME_HDR_SZ (12)
+
+static unsigned int mem_get_le32(const unsigned char *mem) {
+ return (mem[3] << 24)|(mem[2] << 16)|(mem[1] << 8)|(mem[0]);
+}
+
+static void die(const char *fmt, ...) {
+ va_list ap;
+
+ va_start(ap, fmt);
+ vprintf(fmt, ap);
+ if(fmt[strlen(fmt)-1] != '\n')
+ printf("\n");
+ exit(EXIT_FAILURE);
+}
+
+static void die_codec(vpx_codec_ctx_t *ctx, const char *s) {
+ const char *detail = vpx_codec_error_detail(ctx);
+
+ printf("%s: %s\n", s, vpx_codec_error(ctx));
+ if(detail)
+ printf(" %s\n",detail);
+ exit(EXIT_FAILURE);
+}
+
+
+int main(int argc, char **argv) {
+ FILE *infile, *outfile;
+ vpx_codec_ctx_t codec;
+ int flags = 0, frame_cnt = 0;
+ unsigned char file_hdr[IVF_FILE_HDR_SZ];
+ unsigned char frame_hdr[IVF_FRAME_HDR_SZ];
+ unsigned char frame[256*1024];
+ vpx_codec_err_t res;
+
+ (void)res;
+ /* Open files */
+ if(argc!=3)
+ die("Usage: %s <infile> <outfile>\n", argv[0]);
+ if(!(infile = fopen(argv[1], "rb")))
+ die("Failed to open %s for reading", argv[1]);
+ if(!(outfile = fopen(argv[2], "wb")))
+ die("Failed to open %s for writing", argv[2]);
+
+ /* Read file header */
+ if(!(fread(file_hdr, 1, IVF_FILE_HDR_SZ, infile) == IVF_FILE_HDR_SZ
+ && file_hdr[0]=='D' && file_hdr[1]=='K' && file_hdr[2]=='I'
+ && file_hdr[3]=='F'))
+ die("%s is not an IVF file.", argv[1]);
+
+ printf("Using %s\n",vpx_codec_iface_name(interface));
+ /* Initialize codec */
+ if(vpx_codec_dec_init(&codec, interface, NULL, flags))
+ die_codec(&codec, "Failed to initialize decoder");
+
+ /* Read each frame */
+ while(fread(frame_hdr, 1, IVF_FRAME_HDR_SZ, infile) == IVF_FRAME_HDR_SZ) {
+ int frame_sz = mem_get_le32(frame_hdr);
+ vpx_codec_iter_t iter = NULL;
+ vpx_image_t *img;
+
+
+ frame_cnt++;
+ if(frame_sz > sizeof(frame))
+ die("Frame %d data too big for example code buffer", frame_sz);
+ if(fread(frame, 1, frame_sz, infile) != frame_sz)
+ die("Frame %d failed to read complete frame", frame_cnt);
+
+ /* Decode the frame */
+ if(vpx_codec_decode(&codec, frame, frame_sz, NULL, 0))
+ die_codec(&codec, "Failed to decode frame");
+
+ /* Write decoded data to disk */
+ while((img = vpx_codec_get_frame(&codec, &iter))) {
+ unsigned int plane, y;
+
+ for(plane=0; plane < 3; plane++) {
+ unsigned char *buf =img->planes[plane];
+
+ for(y=0; y < (plane ? (img->d_h + 1) >> 1 : img->d_h); y++) {
+ (void) fwrite(buf, 1, (plane ? (img->d_w + 1) >> 1 : img->d_w),
+ outfile);
+ buf += img->stride[plane];
+ }
+ }
+ }
+ }
+ printf("Processed %d frames.\n",frame_cnt);
+ if(vpx_codec_destroy(&codec))
+ die_codec(&codec, "Failed to destroy codec");
+
+ fclose(outfile);
+ fclose(infile);
+ return EXIT_SUCCESS;
+}