ref: 1d9755436d00c1b4091003bc6bc86628d557d6b2
dir: /examples/example_xma.c/
/*
* 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.
*/
/* This is a simple program showing how to initialize the decoder in XMA mode */
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#define VPX_CODEC_DISABLE_COMPAT 1
#include "vpx_config.h"
#include "vpx/vpx_decoder.h"
#include "vpx/vpx_integer.h"
#if CONFIG_VP9_DECODER
#include "vpx/vp8dx.h"
#endif
static char *exec_name;
static int verbose = 0;
static const struct {
const char *name;
vpx_codec_iface_t *iface;
} ifaces[] = {
#if CONFIG_VP9_DECODER
{"vp9", &vpx_codec_vp8_dx_algo},
#endif
};
static void usage_exit(void) {
int i;
printf("Usage: %s <options>\n\n"
"Options:\n"
"\t--codec <name>\tCodec to use (default=%s)\n"
"\t-h <height>\tHeight of the simulated video frame, in pixels\n"
"\t-w <width> \tWidth of the simulated video frame, in pixels\n"
"\t-v \tVerbose mode (show individual segment sizes)\n"
"\t--help \tShow this message\n"
"\n"
"Included decoders:\n"
"\n",
exec_name,
ifaces[0].name);
for (i = 0; i < sizeof(ifaces) / sizeof(ifaces[0]); i++)
printf(" %-6s - %s\n",
ifaces[i].name,
vpx_codec_iface_name(ifaces[i].iface));
exit(EXIT_FAILURE);
}
static void usage_error(const char *fmt, ...) {
va_list ap;
va_start(ap, fmt);
vprintf(fmt, ap);
printf("\n");
usage_exit();
}
void my_mem_dtor(vpx_codec_mmap_t *mmap) {
if (verbose)
printf("freeing segment %d\n", mmap->id);
free(mmap->priv);
}
int main(int argc, char **argv) {
vpx_codec_ctx_t decoder;
vpx_codec_iface_t *iface = ifaces[0].iface;
vpx_codec_iter_t iter;
vpx_codec_dec_cfg_t cfg;
vpx_codec_err_t res = VPX_CODEC_OK;
unsigned int alloc_sz = 0;
unsigned int w = 352;
unsigned int h = 288;
int i;
exec_name = argv[0];
for (i = 1; i < argc; i++) {
if (!strcmp(argv[i], "--codec")) {
if (i + 1 < argc) {
int j, k = -1;
i++;
for (j = 0; j < sizeof(ifaces) / sizeof(ifaces[0]); j++)
if (!strcmp(ifaces[j].name, argv[i]))
k = j;
if (k >= 0)
iface = ifaces[k].iface;
else
usage_error("Error: Unrecognized argument (%s) to --codec\n",
argv[i]);
} else
usage_error("Error: Option --codec requires argument.\n");
} else if (!strcmp(argv[i], "-v"))
verbose = 1;
else if (!strcmp(argv[i], "-h"))
if (i + 1 < argc) {
h = atoi(argv[++i]);
} else
usage_error("Error: Option -h requires argument.\n");
else if (!strcmp(argv[i], "-w"))
if (i + 1 < argc) {
w = atoi(argv[++i]);
} else
usage_error("Error: Option -w requires argument.\n");
else if (!strcmp(argv[i], "--help"))
usage_exit();
else
usage_error("Error: Unrecognized option %s\n\n", argv[i]);
}
if (argc == 1)
printf("Using built-in defaults. For options, rerun with --help\n\n");
/* XMA mode is not supported on all decoders! */
if (!(vpx_codec_get_caps(iface) & VPX_CODEC_CAP_XMA)) {
printf("%s does not support XMA mode!\n", vpx_codec_iface_name(iface));
return EXIT_FAILURE;
}
/* The codec knows how much memory to allocate based on the size of the
* encoded frames. This data can be parsed from the bitstream with
* vpx_codec_peek_stream_info() if a bitstream is available. Otherwise,
* a fixed size can be used that will be the upper limit on the frame
* size the decoder can decode.
*/
cfg.w = w;
cfg.h = h;
/* Initialize the decoder in XMA mode. */
if (vpx_codec_dec_init(&decoder, iface, &cfg, VPX_CODEC_USE_XMA)) {
printf("Failed to initialize decoder in XMA mode: %s\n",
vpx_codec_error(&decoder));
return EXIT_FAILURE;
}
/* Iterate through the list of memory maps, allocating them with the
* requested alignment.
*/
iter = NULL;
do {
vpx_codec_mmap_t mmap;
unsigned int align;
res = vpx_codec_get_mem_map(&decoder, &mmap, &iter);
align = mmap.align ? mmap.align - 1 : 0;
if (!res) {
if (verbose)
printf("Allocating segment %u, size %lu, align %u %s\n",
mmap.id, mmap.sz, mmap.align,
mmap.flags & VPX_CODEC_MEM_ZERO ? "(ZEROED)" : "");
if (mmap.flags & VPX_CODEC_MEM_ZERO)
mmap.priv = calloc(1, mmap.sz + align);
else
mmap.priv = malloc(mmap.sz + align);
mmap.base = (void *)((((uintptr_t)mmap.priv) + align) &
~(uintptr_t)align);
mmap.dtor = my_mem_dtor;
alloc_sz += mmap.sz + align;
if (vpx_codec_set_mem_map(&decoder, &mmap, 1)) {
printf("Failed to set mmap: %s\n", vpx_codec_error(&decoder));
return EXIT_FAILURE;
}
} else if (res != VPX_CODEC_LIST_END) {
printf("Failed to get mmap: %s\n", vpx_codec_error(&decoder));
return EXIT_FAILURE;
}
} while (res != VPX_CODEC_LIST_END);
printf("%s\n %d bytes external memory required for %dx%d.\n",
decoder.name, alloc_sz, cfg.w, cfg.h);
vpx_codec_destroy(&decoder);
return EXIT_SUCCESS;
}