example_xma.c 5.48 KiB
/*
 *  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;
  const 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)
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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;
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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; }