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/*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include "decode_simple.h"
#include "libavutil/common.h"
#include "libavutil/pixdesc.h"
#include "libavutil/error.h"
#include "libavutil/lfg.h"
#include "libavutil/random_seed.h"
#include "libavutil/video_enc_params.h"
#include "libavformat/avformat.h"
#include "libavcodec/avcodec.h"
#include "libswscale/swscale.h"
typedef struct PrivData {
unsigned int random_seed;
AVLFG lfg;
struct SwsContext *scaler;
int v_shift_dst, h_shift_dst;
int v_shift_src, h_shift_src;
AVFrame *frame_ref;
AVFrame *frame_dst;
} PrivData;
static int process_frame(DecodeContext *dc, AVFrame *frame)
{
PrivData *pd = dc->opaque;
int slice_start = 0;
int ret;
if (!frame)
return 0;
if (!pd->scaler) {
pd->scaler = sws_getContext(frame->width, frame->height, frame->format,
pd->frame_ref->width, pd->frame_ref->height,
pd->frame_ref->format, 0, NULL, NULL, NULL);
if (!pd->scaler)
return AVERROR(ENOMEM);
av_pix_fmt_get_chroma_sub_sample(frame->format, &pd->h_shift_src, &pd->v_shift_src);
}
/* scale the whole input frame as reference */
ret = sws_scale(pd->scaler, (const uint8_t **)frame->data, frame->linesize, 0, frame->height,
pd->frame_ref->data, pd->frame_ref->linesize);
if (ret < 0)
return ret;
/* scale slices with randomly generated heights */
while (slice_start < frame->height) {
int slice_height;
const uint8_t *src[4];
slice_height = av_lfg_get(&pd->lfg) % (frame->height - slice_start);
slice_height = FFALIGN(FFMAX(1, slice_height), 1 << pd->v_shift_src);
for (int j = 0; j < FF_ARRAY_ELEMS(src) && frame->data[j]; j++) {
int shift = (j == 1 || j == 2) ? pd->v_shift_src : 0;
src[j] = frame->data[j] + frame->linesize[j] * (slice_start >> shift);
}
ret = sws_scale(pd->scaler, src, frame->linesize, slice_start, slice_height,
pd->frame_dst->data, pd->frame_dst->linesize);
if (ret < 0)
return ret;
slice_start += slice_height;
}
/* compare the two results */
for (int i = 0; i < 4 && pd->frame_ref->data[i]; i++) {
int shift = (i == 1 || i == 2) ? pd->v_shift_dst : 0;
if (memcmp(pd->frame_ref->data[i], pd->frame_dst->data[i],
pd->frame_ref->linesize[i] * (pd->frame_ref->height >> shift))) {
fprintf(stderr, "mismatch frame %d seed %u\n",
dc->decoder->frame_number - 1, pd->random_seed);
return AVERROR(EINVAL);
}
}
return 0;
}
int main(int argc, char **argv)
{
PrivData pd;
DecodeContext dc;
int width, height;
enum AVPixelFormat pix_fmt;
const char *filename;
int ret = 0;
if (argc <= 4) {
fprintf(stderr,
"Usage: %s <input file> <dst width> <dst height> <dst pixfmt> [<random seed>] \n",
argv[0]);
return 0;
}
memset(&pd, 0, sizeof(pd));
filename = argv[1];
width = strtol(argv[2], NULL, 0);
height = strtol(argv[3], NULL, 0);
pix_fmt = av_get_pix_fmt(argv[4]);
/* init RNG for generating slice sizes */
if (argc >= 6)
pd.random_seed = strtoul(argv[5], NULL, 0);
else
pd.random_seed = av_get_random_seed();
av_lfg_init(&pd.lfg, pd.random_seed);
av_pix_fmt_get_chroma_sub_sample(pix_fmt, &pd.h_shift_dst, &pd.v_shift_dst);
/* allocate the frames for scaler output */
for (int i = 0; i < 2; i++) {
AVFrame *frame = av_frame_alloc();
if (!frame) {
fprintf(stderr, "Error allocating frames\n");
return AVERROR(ENOMEM);
}
frame->width = width;
frame->height = height;
frame->format = pix_fmt;
ret = av_frame_get_buffer(frame, 0);
if (ret < 0) {
fprintf(stderr, "Error allocating frame data\n");
return ret;
}
/* make sure the padding is zeroed */
for (int j = 0; j < 4 && frame->data[j]; j++) {
int shift = (j == 1 || j == 2) ? pd.v_shift_dst : 0;
memset(frame->data[j], 0,
frame->linesize[j] * (height >> shift));
}
if (i) pd.frame_ref = frame;
else pd.frame_dst = frame;
}
ret = ds_open(&dc, filename, 0);
if (ret < 0) {
fprintf(stderr, "Error opening the file\n");
return ret;
}
dc.process_frame = process_frame;
dc.opaque = &pd;
ret = ds_run(&dc);
av_frame_free(&pd.frame_dst);
av_frame_free(&pd.frame_ref);
sws_freeContext(pd.scaler);
ds_free(&dc);
return ret;
}
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