178 lines
5.6 KiB
C
178 lines
5.6 KiB
C
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/*
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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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// Decode With Drops Example
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// =========================
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//
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// This is an example utility which drops a series of frames, as specified
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// on the command line. This is useful for observing the error recovery
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// features of the codec.
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//
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// Usage
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// -----
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// This example adds a single argument to the `simple_decoder` example,
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// which specifies the range or pattern of frames to drop. The parameter is
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// parsed as follows:
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//
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// Dropping A Range Of Frames
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// --------------------------
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// To drop a range of frames, specify the starting frame and the ending
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// frame to drop, separated by a dash. The following command will drop
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// frames 5 through 10 (base 1).
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//
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// $ ./decode_with_drops in.ivf out.i420 5-10
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//
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//
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// Dropping A Pattern Of Frames
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// ----------------------------
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// To drop a pattern of frames, specify the number of frames to drop and
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// the number of frames after which to repeat the pattern, separated by
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// a forward-slash. The following command will drop 3 of 7 frames.
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// Specifically, it will decode 4 frames, then drop 3 frames, and then
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// repeat.
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//
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// $ ./decode_with_drops in.ivf out.i420 3/7
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//
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//
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// Extra Variables
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// ---------------
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// This example maintains the pattern passed on the command line in the
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// `n`, `m`, and `is_range` variables:
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//
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//
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// Making The Drop Decision
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// ------------------------
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// The example decides whether to drop the frame based on the current
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// frame number, immediately before decoding the frame.
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#include <stdarg.h>
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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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#define VPX_CODEC_DISABLE_COMPAT 1
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#include "./vpx_config.h"
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#include "vpx/vp8dx.h"
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#include "vpx/vpx_decoder.h"
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#define interface (vpx_codec_vp8_dx())
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#define IVF_FILE_HDR_SZ (32)
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#define IVF_FRAME_HDR_SZ (12)
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static unsigned int mem_get_le32(const unsigned char *mem) {
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return (mem[3] << 24)|(mem[2] << 16)|(mem[1] << 8)|(mem[0]);
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}
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static void die(const char *fmt, ...) {
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va_list ap;
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va_start(ap, fmt);
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vprintf(fmt, ap);
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if(fmt[strlen(fmt)-1] != '\n')
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printf("\n");
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exit(EXIT_FAILURE);
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}
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static void die_codec(vpx_codec_ctx_t *ctx, const char *s) {
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const char *detail = vpx_codec_error_detail(ctx);
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printf("%s: %s\n", s, vpx_codec_error(ctx));
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if(detail)
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printf(" %s\n",detail);
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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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FILE *infile, *outfile;
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vpx_codec_ctx_t codec;
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int flags = 0, frame_cnt = 0;
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unsigned char file_hdr[IVF_FILE_HDR_SZ];
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unsigned char frame_hdr[IVF_FRAME_HDR_SZ];
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unsigned char frame[256*1024];
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vpx_codec_err_t res;
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int n, m, is_range;
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(void)res;
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/* Open files */
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if(argc!=4)
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die("Usage: %s <infile> <outfile> <N-M|N/M>\n", argv[0]);
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{
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char *nptr;
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n = strtol(argv[3], &nptr, 0);
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m = strtol(nptr+1, NULL, 0);
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is_range = *nptr == '-';
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if(!n || !m || (*nptr != '-' && *nptr != '/'))
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die("Couldn't parse pattern %s\n", argv[3]);
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}
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if(!(infile = fopen(argv[1], "rb")))
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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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/* Read file header */
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if(!(fread(file_hdr, 1, IVF_FILE_HDR_SZ, infile) == IVF_FILE_HDR_SZ
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&& file_hdr[0]=='D' && file_hdr[1]=='K' && file_hdr[2]=='I'
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&& file_hdr[3]=='F'))
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die("%s is not an IVF file.", argv[1]);
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printf("Using %s\n",vpx_codec_iface_name(interface));
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/* Initialize codec */
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if(vpx_codec_dec_init(&codec, interface, NULL, flags))
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die_codec(&codec, "Failed to initialize decoder");
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/* Read each frame */
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while(fread(frame_hdr, 1, IVF_FRAME_HDR_SZ, infile) == IVF_FRAME_HDR_SZ) {
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int frame_sz = mem_get_le32(frame_hdr);
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vpx_codec_iter_t iter = NULL;
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vpx_image_t *img;
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frame_cnt++;
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if(frame_sz > sizeof(frame))
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die("Frame %d data too big for example code buffer", frame_sz);
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if(fread(frame, 1, frame_sz, infile) != frame_sz)
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die("Frame %d failed to read complete frame", frame_cnt);
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if((is_range && frame_cnt >= n && frame_cnt <= m)
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||(!is_range && m - (frame_cnt-1)%m <= n)) {
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putc('X', stdout);
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continue;
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}
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putc('.', stdout);
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fflush(stdout);
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/* Decode the frame */
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if(vpx_codec_decode(&codec, frame, frame_sz, NULL, 0))
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die_codec(&codec, "Failed to decode frame");
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/* Write decoded data to disk */
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while((img = vpx_codec_get_frame(&codec, &iter))) {
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unsigned int plane, y;
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for(plane=0; plane < 3; plane++) {
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unsigned char *buf =img->planes[plane];
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for(y=0; y < (plane ? (img->d_h + 1) >> 1 : img->d_h); y++) {
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(void) fwrite(buf, 1, (plane ? (img->d_w + 1) >> 1 : img->d_w),
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outfile);
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buf += img->stride[plane];
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}
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}
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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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fclose(outfile);
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fclose(infile);
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return EXIT_SUCCESS;
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}
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