139 строки
4.5 KiB
C
139 строки
4.5 KiB
C
/*
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* Copyright (c) 2010 The WebM project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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// Postprocessing Decoder
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// ======================
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//
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// This example adds postprocessing to the simple decoder loop.
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//
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// Initializing Postprocessing
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// ---------------------------
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// You must inform the codec that you might request postprocessing at
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// initialization time. This is done by passing the VPX_CODEC_USE_POSTPROC
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// flag to `vpx_codec_dec_init`. If the codec does not support
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// postprocessing, this call will return VPX_CODEC_INCAPABLE. For
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// demonstration purposes, we also fall back to default initialization if
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// the codec does not provide support.
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//
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// Using Adaptive Postprocessing
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// -----------------------------
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// VP6 provides "adaptive postprocessing." It will automatically select the
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// best postprocessing filter on a frame by frame basis based on the amount
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// of time remaining before the user's specified deadline expires. The
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// special value 0 indicates that the codec should take as long as
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// necessary to provide the best quality frame. This example gives the
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// codec 15ms (15000us) to return a frame. Remember that this is a soft
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// deadline, and the codec may exceed it doing its regular processing. In
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// these cases, no additional postprocessing will be done.
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//
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// Codec Specific Postprocessing Controls
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// --------------------------------------
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// Some codecs provide fine grained controls over their built-in
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// postprocessors. VP8 is one example. The following sample code toggles
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// postprocessing on and off every 15 frames.
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "vpx/vp8dx.h"
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#include "vpx/vpx_decoder.h"
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#include "../tools_common.h"
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#include "../video_reader.h"
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#include "./vpx_config.h"
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static const char *exec_name;
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void usage_exit(void) {
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fprintf(stderr, "Usage: %s <infile> <outfile>\n", exec_name);
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exit(EXIT_FAILURE);
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}
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int main(int argc, char **argv) {
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int frame_cnt = 0;
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FILE *outfile = NULL;
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vpx_codec_ctx_t codec;
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vpx_codec_err_t res;
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VpxVideoReader *reader = NULL;
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const VpxInterface *decoder = NULL;
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const VpxVideoInfo *info = NULL;
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exec_name = argv[0];
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if (argc != 3)
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die("Invalid number of arguments.");
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reader = vpx_video_reader_open(argv[1]);
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if (!reader)
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die("Failed to open %s for reading.", argv[1]);
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if (!(outfile = fopen(argv[2], "wb")))
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die("Failed to open %s for writing", argv[2]);
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info = vpx_video_reader_get_info(reader);
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decoder = get_vpx_decoder_by_fourcc(info->codec_fourcc);
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if (!decoder)
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die("Unknown input codec.");
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printf("Using %s\n", vpx_codec_iface_name(decoder->codec_interface()));
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res = vpx_codec_dec_init(&codec, decoder->codec_interface(), NULL,
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VPX_CODEC_USE_POSTPROC);
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if (res == VPX_CODEC_INCAPABLE)
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die_codec(&codec, "Postproc not supported by this decoder.");
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if (res)
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die_codec(&codec, "Failed to initialize decoder.");
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while (vpx_video_reader_read_frame(reader)) {
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vpx_codec_iter_t iter = NULL;
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vpx_image_t *img = NULL;
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size_t frame_size = 0;
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const unsigned char *frame = vpx_video_reader_get_frame(reader,
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&frame_size);
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++frame_cnt;
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if (frame_cnt % 30 == 1) {
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vp8_postproc_cfg_t pp = {0, 0, 0};
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if (vpx_codec_control(&codec, VP8_SET_POSTPROC, &pp))
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die_codec(&codec, "Failed to turn off postproc.");
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} else if (frame_cnt % 30 == 16) {
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vp8_postproc_cfg_t pp = {VP8_DEBLOCK | VP8_DEMACROBLOCK | VP8_MFQE,
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4, 0};
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if (vpx_codec_control(&codec, VP8_SET_POSTPROC, &pp))
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die_codec(&codec, "Failed to turn on postproc.");
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};
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// Decode the frame with 15ms deadline
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if (vpx_codec_decode(&codec, frame, (unsigned int)frame_size, NULL, 15000))
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die_codec(&codec, "Failed to decode frame");
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while ((img = vpx_codec_get_frame(&codec, &iter)) != NULL) {
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vpx_img_write(img, outfile);
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}
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}
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printf("Processed %d frames.\n", frame_cnt);
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if (vpx_codec_destroy(&codec))
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die_codec(&codec, "Failed to destroy codec");
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printf("Play: ffplay -f rawvideo -pix_fmt yuv420p -s %dx%d %s\n",
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info->frame_width, info->frame_height, argv[2]);
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vpx_video_reader_close(reader);
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fclose(outfile);
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return EXIT_SUCCESS;
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}
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