50fa58592b
All documentation will be provided as comments in the source files. Change-Id: Ie609852747733c181191f864204c787a6b23ef3a
329 lines
9.8 KiB
C
329 lines
9.8 KiB
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.
|
|
*/
|
|
|
|
// Decode With Partial Drops Example
|
|
// =========================
|
|
//
|
|
// This is an example utility which drops a series of frames (or parts of
|
|
// frames), as specified on the command line. This is useful for observing the
|
|
// error recovery features of the codec.
|
|
//
|
|
// Usage
|
|
// -----
|
|
// This example adds a single argument to the `simple_decoder` example,
|
|
// which specifies the range or pattern of frames to drop. The parameter is
|
|
// parsed as follows.
|
|
//
|
|
// Dropping A Range Of Frames
|
|
// --------------------------
|
|
// To drop a range of frames, specify the starting frame and the ending
|
|
// frame to drop, separated by a dash. The following command will drop
|
|
// frames 5 through 10 (base 1).
|
|
//
|
|
// $ ./decode_with_partial_drops in.ivf out.i420 5-10
|
|
//
|
|
//
|
|
// Dropping A Pattern Of Frames
|
|
// ----------------------------
|
|
// To drop a pattern of frames, specify the number of frames to drop and
|
|
// the number of frames after which to repeat the pattern, separated by
|
|
// a forward-slash. The following command will drop 3 of 7 frames.
|
|
// Specifically, it will decode 4 frames, then drop 3 frames, and then
|
|
// repeat.
|
|
//
|
|
// $ ./decode_with_partial_drops in.ivf out.i420 3/7
|
|
//
|
|
// Dropping Random Parts Of Frames
|
|
// -------------------------------
|
|
// A third argument tuple is available to split the frame into 1500 bytes pieces
|
|
// and randomly drop pieces rather than frames. The frame will be split at
|
|
// partition boundaries where possible. The following example will seed the RNG
|
|
// with the seed 123 and drop approximately 5% of the pieces. Pieces which
|
|
// are depending on an already dropped piece will also be dropped.
|
|
//
|
|
// $ ./decode_with_partial_drops in.ivf out.i420 5,123
|
|
//
|
|
// Extra Variables
|
|
// ---------------
|
|
// This example maintains the pattern passed on the command line in the
|
|
// `n`, `m`, and `is_range` variables:
|
|
//
|
|
// Making The Drop Decision
|
|
// ------------------------
|
|
// The example decides whether to drop the frame based on the current
|
|
// frame number, immediately before decoding the frame.
|
|
|
|
#include <stdarg.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#define VPX_CODEC_DISABLE_COMPAT 1
|
|
#include "./vpx_config.h"
|
|
#include "vpx/vp8dx.h"
|
|
#include "vpx/vpx_decoder.h"
|
|
#define interface (vpx_codec_vp8_dx())
|
|
#include <time.h>
|
|
|
|
|
|
#define IVF_FILE_HDR_SZ (32)
|
|
#define IVF_FRAME_HDR_SZ (12)
|
|
|
|
static unsigned int mem_get_le32(const unsigned char *mem) {
|
|
return (mem[3] << 24)|(mem[2] << 16)|(mem[1] << 8)|(mem[0]);
|
|
}
|
|
|
|
static void die(const char *fmt, ...) {
|
|
va_list ap;
|
|
|
|
va_start(ap, fmt);
|
|
vprintf(fmt, ap);
|
|
if(fmt[strlen(fmt)-1] != '\n')
|
|
printf("\n");
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
static void die_codec(vpx_codec_ctx_t *ctx, const char *s) {
|
|
const char *detail = vpx_codec_error_detail(ctx);
|
|
|
|
printf("%s: %s\n", s, vpx_codec_error(ctx));
|
|
if(detail)
|
|
printf(" %s\n",detail);
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
struct parsed_header
|
|
{
|
|
char key_frame;
|
|
int version;
|
|
char show_frame;
|
|
int first_part_size;
|
|
};
|
|
|
|
int next_packet(struct parsed_header* hdr, int pos, int length, int mtu)
|
|
{
|
|
int size = 0;
|
|
int remaining = length - pos;
|
|
/* Uncompressed part is 3 bytes for P frames and 10 bytes for I frames */
|
|
int uncomp_part_size = (hdr->key_frame ? 10 : 3);
|
|
/* number of bytes yet to send from header and the first partition */
|
|
int remainFirst = uncomp_part_size + hdr->first_part_size - pos;
|
|
if (remainFirst > 0)
|
|
{
|
|
if (remainFirst <= mtu)
|
|
{
|
|
size = remainFirst;
|
|
}
|
|
else
|
|
{
|
|
size = mtu;
|
|
}
|
|
|
|
return size;
|
|
}
|
|
|
|
/* second partition; just slot it up according to MTU */
|
|
if (remaining <= mtu)
|
|
{
|
|
size = remaining;
|
|
return size;
|
|
}
|
|
return mtu;
|
|
}
|
|
|
|
void throw_packets(unsigned char* frame, int* size, int loss_rate,
|
|
int* thrown, int* kept)
|
|
{
|
|
unsigned char loss_frame[256*1024];
|
|
int pkg_size = 1;
|
|
int pos = 0;
|
|
int loss_pos = 0;
|
|
struct parsed_header hdr;
|
|
unsigned int tmp;
|
|
int mtu = 1500;
|
|
|
|
if (*size < 3)
|
|
{
|
|
return;
|
|
}
|
|
putc('|', stdout);
|
|
/* parse uncompressed 3 bytes */
|
|
tmp = (frame[2] << 16) | (frame[1] << 8) | frame[0];
|
|
hdr.key_frame = !(tmp & 0x1); /* inverse logic */
|
|
hdr.version = (tmp >> 1) & 0x7;
|
|
hdr.show_frame = (tmp >> 4) & 0x1;
|
|
hdr.first_part_size = (tmp >> 5) & 0x7FFFF;
|
|
|
|
/* don't drop key frames */
|
|
if (hdr.key_frame)
|
|
{
|
|
int i;
|
|
*kept = *size/mtu + ((*size % mtu > 0) ? 1 : 0); /* approximate */
|
|
for (i=0; i < *kept; i++)
|
|
putc('.', stdout);
|
|
return;
|
|
}
|
|
|
|
while ((pkg_size = next_packet(&hdr, pos, *size, mtu)) > 0)
|
|
{
|
|
int loss_event = ((rand() + 1.0)/(RAND_MAX + 1.0) < loss_rate/100.0);
|
|
if (*thrown == 0 && !loss_event)
|
|
{
|
|
memcpy(loss_frame + loss_pos, frame + pos, pkg_size);
|
|
loss_pos += pkg_size;
|
|
(*kept)++;
|
|
putc('.', stdout);
|
|
}
|
|
else
|
|
{
|
|
(*thrown)++;
|
|
putc('X', stdout);
|
|
}
|
|
pos += pkg_size;
|
|
}
|
|
memcpy(frame, loss_frame, loss_pos);
|
|
memset(frame + loss_pos, 0, *size - loss_pos);
|
|
*size = loss_pos;
|
|
}
|
|
|
|
int main(int argc, char **argv) {
|
|
FILE *infile, *outfile;
|
|
vpx_codec_ctx_t codec;
|
|
int flags = 0, frame_cnt = 0;
|
|
unsigned char file_hdr[IVF_FILE_HDR_SZ];
|
|
unsigned char frame_hdr[IVF_FRAME_HDR_SZ];
|
|
unsigned char frame[256*1024];
|
|
vpx_codec_err_t res;
|
|
int n, m, mode;
|
|
unsigned int seed;
|
|
int thrown=0, kept=0;
|
|
int thrown_frame=0, kept_frame=0;
|
|
vpx_codec_dec_cfg_t dec_cfg = {0};
|
|
|
|
(void)res;
|
|
/* Open files */
|
|
if(argc < 4 || argc > 6)
|
|
die("Usage: %s <infile> <outfile> [-t <num threads>] <N-M|N/M|L,S>\n",
|
|
argv[0]);
|
|
{
|
|
char *nptr;
|
|
int arg_num = 3;
|
|
if (argc == 6 && strncmp(argv[arg_num++], "-t", 2) == 0)
|
|
dec_cfg.threads = strtol(argv[arg_num++], NULL, 0);
|
|
n = strtol(argv[arg_num], &nptr, 0);
|
|
mode = (*nptr == '\0' || *nptr == ',') ? 2 : (*nptr == '-') ? 1 : 0;
|
|
|
|
m = strtol(nptr+1, NULL, 0);
|
|
if((!n && !m) || (*nptr != '-' && *nptr != '/' &&
|
|
*nptr != '\0' && *nptr != ','))
|
|
die("Couldn't parse pattern %s\n", argv[3]);
|
|
}
|
|
seed = (m > 0) ? m : (unsigned int)time(NULL);
|
|
srand(seed);thrown_frame = 0;
|
|
printf("Seed: %u\n", seed);
|
|
printf("Threads: %d\n", dec_cfg.threads);
|
|
if(!(infile = fopen(argv[1], "rb")))
|
|
die("Failed to open %s for reading", argv[1]);
|
|
if(!(outfile = fopen(argv[2], "wb")))
|
|
die("Failed to open %s for writing", argv[2]);
|
|
|
|
/* Read file header */
|
|
if(!(fread(file_hdr, 1, IVF_FILE_HDR_SZ, infile) == IVF_FILE_HDR_SZ
|
|
&& file_hdr[0]=='D' && file_hdr[1]=='K' && file_hdr[2]=='I'
|
|
&& file_hdr[3]=='F'))
|
|
die("%s is not an IVF file.", argv[1]);
|
|
|
|
printf("Using %s\n",vpx_codec_iface_name(interface));
|
|
/* Initialize codec */
|
|
flags = VPX_CODEC_USE_ERROR_CONCEALMENT;
|
|
res = vpx_codec_dec_init(&codec, interface, &dec_cfg, flags);
|
|
if(res)
|
|
die_codec(&codec, "Failed to initialize decoder");
|
|
|
|
|
|
/* Read each frame */
|
|
while(fread(frame_hdr, 1, IVF_FRAME_HDR_SZ, infile) == IVF_FRAME_HDR_SZ) {
|
|
int frame_sz = mem_get_le32(frame_hdr);
|
|
vpx_codec_iter_t iter = NULL;
|
|
vpx_image_t *img;
|
|
|
|
|
|
frame_cnt++;
|
|
if(frame_sz > sizeof(frame))
|
|
die("Frame %d data too big for example code buffer", frame_sz);
|
|
if(fread(frame, 1, frame_sz, infile) != frame_sz)
|
|
die("Frame %d failed to read complete frame", frame_cnt);
|
|
|
|
/* Decide whether to throw parts of the frame or the whole frame
|
|
depending on the drop mode */
|
|
thrown_frame = 0;
|
|
kept_frame = 0;
|
|
switch (mode)
|
|
{
|
|
case 0:
|
|
if (m - (frame_cnt-1)%m <= n)
|
|
{
|
|
frame_sz = 0;
|
|
}
|
|
break;
|
|
case 1:
|
|
if (frame_cnt >= n && frame_cnt <= m)
|
|
{
|
|
frame_sz = 0;
|
|
}
|
|
break;
|
|
case 2:
|
|
throw_packets(frame, &frame_sz, n, &thrown_frame, &kept_frame);
|
|
break;
|
|
default: break;
|
|
}
|
|
if (mode < 2)
|
|
{
|
|
if (frame_sz == 0)
|
|
{
|
|
putc('X', stdout);
|
|
thrown_frame++;
|
|
}
|
|
else
|
|
{
|
|
putc('.', stdout);
|
|
kept_frame++;
|
|
}
|
|
}
|
|
thrown += thrown_frame;
|
|
kept += kept_frame;
|
|
fflush(stdout);
|
|
/* Decode the frame */
|
|
if(vpx_codec_decode(&codec, frame, frame_sz, NULL, 0))
|
|
die_codec(&codec, "Failed to decode frame");
|
|
|
|
/* Write decoded data to disk */
|
|
while((img = vpx_codec_get_frame(&codec, &iter))) {
|
|
unsigned int plane, y;
|
|
|
|
for(plane=0; plane < 3; plane++) {
|
|
unsigned char *buf =img->planes[plane];
|
|
|
|
for(y=0; y < (plane ? (img->d_h + 1) >> 1 : img->d_h); y++) {
|
|
(void) fwrite(buf, 1, (plane ? (img->d_w + 1) >> 1 : img->d_w),
|
|
outfile);
|
|
buf += img->stride[plane];
|
|
}
|
|
}
|
|
}
|
|
}
|
|
printf("Processed %d frames.\n",frame_cnt);
|
|
if(vpx_codec_destroy(&codec))
|
|
die_codec(&codec, "Failed to destroy codec");
|
|
|
|
fclose(outfile);
|
|
fclose(infile);
|
|
return EXIT_SUCCESS;
|
|
}
|