postproc
/*
* 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.
*/
// Postprocessing Decoder
// ======================
//
// This example adds postprocessing to the simple decoder loop.
//
// Initializing Postprocessing
// ---------------------------
// You must inform the codec that you might request postprocessing at
// initialization time. This is done by passing the VPX_CODEC_USE_POSTPROC
// flag to `vpx_codec_dec_init`. If the codec does not support
// postprocessing, this call will return VPX_CODEC_INCAPABLE. For
// demonstration purposes, we also fall back to default initialization if
// the codec does not provide support.
//
// Using Adaptive Postprocessing
// -----------------------------
// VP6 provides "adaptive postprocessing." It will automatically select the
// best postprocessing filter on a frame by frame basis based on the amount
// of time remaining before the user's specified deadline expires. The
// special value 0 indicates that the codec should take as long as
// necessary to provide the best quality frame. This example gives the
// codec 15ms (15000us) to return a frame. Remember that this is a soft
// deadline, and the codec may exceed it doing its regular processing. In
// these cases, no additional postprocessing will be done.
//
// Codec Specific Postprocessing Controls
// --------------------------------------
// Some codecs provide fine grained controls over their built-in
// postprocessors. VP8 is one example. The following sample code toggles
// postprocessing on and off every 15 frames.
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "vpx/vp8dx.h"
#include "vpx/vpx_decoder.h"
#include "../tools_common.h"
#include "../video_reader.h"
#include "./vpx_config.h"
static const char *exec_name;
void usage_exit(void) {
fprintf(stderr, "Usage: %s <infile> <outfile>\n", exec_name);
exit(EXIT_FAILURE);
}
int main(int argc, char **argv) {
int frame_cnt = 0;
FILE *outfile = NULL;
vpx_codec_ctx_t codec;
vpx_codec_err_t res;
VpxVideoReader *reader = NULL;
const VpxInterface *decoder = NULL;
const VpxVideoInfo *info = NULL;
exec_name = argv[0];
if (argc != 3) die("Invalid number of arguments.");
reader = vpx_video_reader_open(argv[1]);
if (!reader) die("Failed to open %s for reading.", argv[1]);
if (!(outfile = fopen(argv[2], "wb")))
die("Failed to open %s for writing", argv[2]);
info = vpx_video_reader_get_info(reader);
decoder = get_vpx_decoder_by_fourcc(info->codec_fourcc);
if (!decoder) die("Unknown input codec.");
printf("Using %s\n", vpx_codec_iface_name(decoder->codec_interface()));
res = vpx_codec_dec_init(&codec, decoder->codec_interface(), NULL,
VPX_CODEC_USE_POSTPROC);
if (res == VPX_CODEC_INCAPABLE)
die("Postproc not supported by this decoder.");
if (res) die("Failed to initialize decoder.");
while (vpx_video_reader_read_frame(reader)) {
vpx_codec_iter_t iter = NULL;
vpx_image_t *img = NULL;
size_t frame_size = 0;
const unsigned char *frame =
vpx_video_reader_get_frame(reader, &frame_size);
++frame_cnt;
if (frame_cnt % 30 == 1) {
vp8_postproc_cfg_t pp = { 0, 0, 0 };
if (vpx_codec_control(&codec, VP8_SET_POSTPROC, &pp))
die_codec(&codec, "Failed to turn off postproc.");
} else if (frame_cnt % 30 == 16) {
vp8_postproc_cfg_t pp = { VP8_DEBLOCK | VP8_DEMACROBLOCK | VP8_MFQE, 4,
0 };
if (vpx_codec_control(&codec, VP8_SET_POSTPROC, &pp))
die_codec(&codec, "Failed to turn on postproc.");
}
// Decode the frame with 15ms deadline
if (vpx_codec_decode(&codec, frame, (unsigned int)frame_size, NULL, 15000))
die_codec(&codec, "Failed to decode frame");
while ((img = vpx_codec_get_frame(&codec, &iter)) != NULL) {
vpx_img_write(img, outfile);
}
}
printf("Processed %d frames.\n", frame_cnt);
if (vpx_codec_destroy(&codec)) die_codec(&codec, "Failed to destroy codec");
printf("Play: ffplay -f rawvideo -pix_fmt yuv420p -s %dx%d %s\n",
info->frame_width, info->frame_height, argv[2]);
vpx_video_reader_close(reader);
fclose(outfile);
return EXIT_SUCCESS;
}
vpx_codec_destroy
vpx_codec_err_t vpx_codec_destroy(vpx_codec_ctx_t *ctx)
Destroy a codec instance.
vpx_codec_iter_t
const void * vpx_codec_iter_t
Iterator.
Definition vpx_codec.h:190
vpx_codec_iface_name
const char * vpx_codec_iface_name(vpx_codec_iface_t *iface)
Return the name for a given interface.
vpx_codec_control
#define vpx_codec_control(ctx, id, data)
vpx_codec_control wrapper macro
Definition vpx_codec.h:411
vpx_codec_err_t
vpx_codec_err_t
Algorithm return codes.
Definition vpx_codec.h:93
VPX_CODEC_INCAPABLE
@ VPX_CODEC_INCAPABLE
Algorithm does not have required capability.
Definition vpx_codec.h:107
vpx_codec_decode
vpx_codec_err_t vpx_codec_decode(vpx_codec_ctx_t *ctx, const uint8_t *data, unsigned int data_sz, void *user_priv, long deadline)
Decode data.
VPX_CODEC_USE_POSTPROC
#define VPX_CODEC_USE_POSTPROC
Initialization-time Feature Enabling.
Definition vpx_decoder.h:73
vpx_codec_dec_init
#define vpx_codec_dec_init(ctx, iface, cfg, flags)
Convenience macro for vpx_codec_dec_init_ver()
Definition vpx_decoder.h:143
vpx_codec_get_frame
vpx_image_t * vpx_codec_get_frame(vpx_codec_ctx_t *ctx, vpx_codec_iter_t *iter)
Decoded frames iterator.
VP8_SET_POSTPROC
@ VP8_SET_POSTPROC
Definition vp8.h:49
vp8_postproc_cfg
post process flags
Definition vp8.h:79
vpx_codec_ctx
Codec context structure.
Definition vpx_codec.h:200
vpx_image
Image Descriptor.
Definition vpx_image.h:76
vp8dx.h
Provides definitions for using VP8 or VP9 within the vpx Decoder interface.
vpx_decoder.h
Describes the decoder algorithm interface to applications.