ref: 1589ecb0ae62a2761e1ff64061e81b888409d7ea
dir: /examples/postproc.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. */ // 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_codec(&codec, "Postproc not supported by this decoder."); if (res) die_codec(&codec, "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; }