forked from KolibriOS/kolibrios
282 lines
9.0 KiB
C
282 lines
9.0 KiB
C
|
/*
|
||
|
* Copyright (c) 2010 Nicolas George
|
||
|
* Copyright (c) 2011 Stefano Sabatini
|
||
|
*
|
||
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||
|
* of this software and associated documentation files (the "Software"), to deal
|
||
|
* in the Software without restriction, including without limitation the rights
|
||
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||
|
* copies of the Software, and to permit persons to whom the Software is
|
||
|
* furnished to do so, subject to the following conditions:
|
||
|
*
|
||
|
* The above copyright notice and this permission notice shall be included in
|
||
|
* all copies or substantial portions of the Software.
|
||
|
*
|
||
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
|
||
|
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
||
|
* THE SOFTWARE.
|
||
|
*/
|
||
|
|
||
|
/**
|
||
|
* @file
|
||
|
* API example for decoding and filtering
|
||
|
* @example filtering_video.c
|
||
|
*/
|
||
|
|
||
|
#define _XOPEN_SOURCE 600 /* for usleep */
|
||
|
#include <unistd.h>
|
||
|
|
||
|
#include <libavcodec/avcodec.h>
|
||
|
#include <libavformat/avformat.h>
|
||
|
#include <libavfilter/avfiltergraph.h>
|
||
|
#include <libavfilter/avcodec.h>
|
||
|
#include <libavfilter/buffersink.h>
|
||
|
#include <libavfilter/buffersrc.h>
|
||
|
#include <libavutil/opt.h>
|
||
|
|
||
|
const char *filter_descr = "scale=78:24,transpose=cclock";
|
||
|
/* other way:
|
||
|
scale=78:24 [scl]; [scl] transpose=cclock // assumes "[in]" and "[out]" to be input output pads respectively
|
||
|
*/
|
||
|
|
||
|
static AVFormatContext *fmt_ctx;
|
||
|
static AVCodecContext *dec_ctx;
|
||
|
AVFilterContext *buffersink_ctx;
|
||
|
AVFilterContext *buffersrc_ctx;
|
||
|
AVFilterGraph *filter_graph;
|
||
|
static int video_stream_index = -1;
|
||
|
static int64_t last_pts = AV_NOPTS_VALUE;
|
||
|
|
||
|
static int open_input_file(const char *filename)
|
||
|
{
|
||
|
int ret;
|
||
|
AVCodec *dec;
|
||
|
|
||
|
if ((ret = avformat_open_input(&fmt_ctx, filename, NULL, NULL)) < 0) {
|
||
|
av_log(NULL, AV_LOG_ERROR, "Cannot open input file\n");
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
if ((ret = avformat_find_stream_info(fmt_ctx, NULL)) < 0) {
|
||
|
av_log(NULL, AV_LOG_ERROR, "Cannot find stream information\n");
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
/* select the video stream */
|
||
|
ret = av_find_best_stream(fmt_ctx, AVMEDIA_TYPE_VIDEO, -1, -1, &dec, 0);
|
||
|
if (ret < 0) {
|
||
|
av_log(NULL, AV_LOG_ERROR, "Cannot find a video stream in the input file\n");
|
||
|
return ret;
|
||
|
}
|
||
|
video_stream_index = ret;
|
||
|
dec_ctx = fmt_ctx->streams[video_stream_index]->codec;
|
||
|
av_opt_set_int(dec_ctx, "refcounted_frames", 1, 0);
|
||
|
|
||
|
/* init the video decoder */
|
||
|
if ((ret = avcodec_open2(dec_ctx, dec, NULL)) < 0) {
|
||
|
av_log(NULL, AV_LOG_ERROR, "Cannot open video decoder\n");
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static int init_filters(const char *filters_descr)
|
||
|
{
|
||
|
char args[512];
|
||
|
int ret = 0;
|
||
|
AVFilter *buffersrc = avfilter_get_by_name("buffer");
|
||
|
AVFilter *buffersink = avfilter_get_by_name("buffersink");
|
||
|
AVFilterInOut *outputs = avfilter_inout_alloc();
|
||
|
AVFilterInOut *inputs = avfilter_inout_alloc();
|
||
|
AVRational time_base = fmt_ctx->streams[video_stream_index]->time_base;
|
||
|
enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE };
|
||
|
|
||
|
filter_graph = avfilter_graph_alloc();
|
||
|
if (!outputs || !inputs || !filter_graph) {
|
||
|
ret = AVERROR(ENOMEM);
|
||
|
goto end;
|
||
|
}
|
||
|
|
||
|
/* buffer video source: the decoded frames from the decoder will be inserted here. */
|
||
|
snprintf(args, sizeof(args),
|
||
|
"video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:pixel_aspect=%d/%d",
|
||
|
dec_ctx->width, dec_ctx->height, dec_ctx->pix_fmt,
|
||
|
time_base.num, time_base.den,
|
||
|
dec_ctx->sample_aspect_ratio.num, dec_ctx->sample_aspect_ratio.den);
|
||
|
|
||
|
ret = avfilter_graph_create_filter(&buffersrc_ctx, buffersrc, "in",
|
||
|
args, NULL, filter_graph);
|
||
|
if (ret < 0) {
|
||
|
av_log(NULL, AV_LOG_ERROR, "Cannot create buffer source\n");
|
||
|
goto end;
|
||
|
}
|
||
|
|
||
|
/* buffer video sink: to terminate the filter chain. */
|
||
|
ret = avfilter_graph_create_filter(&buffersink_ctx, buffersink, "out",
|
||
|
NULL, NULL, filter_graph);
|
||
|
if (ret < 0) {
|
||
|
av_log(NULL, AV_LOG_ERROR, "Cannot create buffer sink\n");
|
||
|
goto end;
|
||
|
}
|
||
|
|
||
|
ret = av_opt_set_int_list(buffersink_ctx, "pix_fmts", pix_fmts,
|
||
|
AV_PIX_FMT_NONE, AV_OPT_SEARCH_CHILDREN);
|
||
|
if (ret < 0) {
|
||
|
av_log(NULL, AV_LOG_ERROR, "Cannot set output pixel format\n");
|
||
|
goto end;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Set the endpoints for the filter graph. The filter_graph will
|
||
|
* be linked to the graph described by filters_descr.
|
||
|
*/
|
||
|
|
||
|
/*
|
||
|
* The buffer source output must be connected to the input pad of
|
||
|
* the first filter described by filters_descr; since the first
|
||
|
* filter input label is not specified, it is set to "in" by
|
||
|
* default.
|
||
|
*/
|
||
|
outputs->name = av_strdup("in");
|
||
|
outputs->filter_ctx = buffersrc_ctx;
|
||
|
outputs->pad_idx = 0;
|
||
|
outputs->next = NULL;
|
||
|
|
||
|
/*
|
||
|
* The buffer sink input must be connected to the output pad of
|
||
|
* the last filter described by filters_descr; since the last
|
||
|
* filter output label is not specified, it is set to "out" by
|
||
|
* default.
|
||
|
*/
|
||
|
inputs->name = av_strdup("out");
|
||
|
inputs->filter_ctx = buffersink_ctx;
|
||
|
inputs->pad_idx = 0;
|
||
|
inputs->next = NULL;
|
||
|
|
||
|
if ((ret = avfilter_graph_parse_ptr(filter_graph, filters_descr,
|
||
|
&inputs, &outputs, NULL)) < 0)
|
||
|
goto end;
|
||
|
|
||
|
if ((ret = avfilter_graph_config(filter_graph, NULL)) < 0)
|
||
|
goto end;
|
||
|
|
||
|
end:
|
||
|
avfilter_inout_free(&inputs);
|
||
|
avfilter_inout_free(&outputs);
|
||
|
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
static void display_frame(const AVFrame *frame, AVRational time_base)
|
||
|
{
|
||
|
int x, y;
|
||
|
uint8_t *p0, *p;
|
||
|
int64_t delay;
|
||
|
|
||
|
if (frame->pts != AV_NOPTS_VALUE) {
|
||
|
if (last_pts != AV_NOPTS_VALUE) {
|
||
|
/* sleep roughly the right amount of time;
|
||
|
* usleep is in microseconds, just like AV_TIME_BASE. */
|
||
|
delay = av_rescale_q(frame->pts - last_pts,
|
||
|
time_base, AV_TIME_BASE_Q);
|
||
|
if (delay > 0 && delay < 1000000)
|
||
|
usleep(delay);
|
||
|
}
|
||
|
last_pts = frame->pts;
|
||
|
}
|
||
|
|
||
|
/* Trivial ASCII grayscale display. */
|
||
|
p0 = frame->data[0];
|
||
|
puts("\033c");
|
||
|
for (y = 0; y < frame->height; y++) {
|
||
|
p = p0;
|
||
|
for (x = 0; x < frame->width; x++)
|
||
|
putchar(" .-+#"[*(p++) / 52]);
|
||
|
putchar('\n');
|
||
|
p0 += frame->linesize[0];
|
||
|
}
|
||
|
fflush(stdout);
|
||
|
}
|
||
|
|
||
|
int main(int argc, char **argv)
|
||
|
{
|
||
|
int ret;
|
||
|
AVPacket packet;
|
||
|
AVFrame *frame = av_frame_alloc();
|
||
|
AVFrame *filt_frame = av_frame_alloc();
|
||
|
int got_frame;
|
||
|
|
||
|
if (!frame || !filt_frame) {
|
||
|
perror("Could not allocate frame");
|
||
|
exit(1);
|
||
|
}
|
||
|
if (argc != 2) {
|
||
|
fprintf(stderr, "Usage: %s file\n", argv[0]);
|
||
|
exit(1);
|
||
|
}
|
||
|
|
||
|
av_register_all();
|
||
|
avfilter_register_all();
|
||
|
|
||
|
if ((ret = open_input_file(argv[1])) < 0)
|
||
|
goto end;
|
||
|
if ((ret = init_filters(filter_descr)) < 0)
|
||
|
goto end;
|
||
|
|
||
|
/* read all packets */
|
||
|
while (1) {
|
||
|
if ((ret = av_read_frame(fmt_ctx, &packet)) < 0)
|
||
|
break;
|
||
|
|
||
|
if (packet.stream_index == video_stream_index) {
|
||
|
got_frame = 0;
|
||
|
ret = avcodec_decode_video2(dec_ctx, frame, &got_frame, &packet);
|
||
|
if (ret < 0) {
|
||
|
av_log(NULL, AV_LOG_ERROR, "Error decoding video\n");
|
||
|
break;
|
||
|
}
|
||
|
|
||
|
if (got_frame) {
|
||
|
frame->pts = av_frame_get_best_effort_timestamp(frame);
|
||
|
|
||
|
/* push the decoded frame into the filtergraph */
|
||
|
if (av_buffersrc_add_frame_flags(buffersrc_ctx, frame, AV_BUFFERSRC_FLAG_KEEP_REF) < 0) {
|
||
|
av_log(NULL, AV_LOG_ERROR, "Error while feeding the filtergraph\n");
|
||
|
break;
|
||
|
}
|
||
|
|
||
|
/* pull filtered frames from the filtergraph */
|
||
|
while (1) {
|
||
|
ret = av_buffersink_get_frame(buffersink_ctx, filt_frame);
|
||
|
if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF)
|
||
|
break;
|
||
|
if (ret < 0)
|
||
|
goto end;
|
||
|
display_frame(filt_frame, buffersink_ctx->inputs[0]->time_base);
|
||
|
av_frame_unref(filt_frame);
|
||
|
}
|
||
|
av_frame_unref(frame);
|
||
|
}
|
||
|
}
|
||
|
av_free_packet(&packet);
|
||
|
}
|
||
|
end:
|
||
|
avfilter_graph_free(&filter_graph);
|
||
|
avcodec_close(dec_ctx);
|
||
|
avformat_close_input(&fmt_ctx);
|
||
|
av_frame_free(&frame);
|
||
|
av_frame_free(&filt_frame);
|
||
|
|
||
|
if (ret < 0 && ret != AVERROR_EOF) {
|
||
|
fprintf(stderr, "Error occurred: %s\n", av_err2str(ret));
|
||
|
exit(1);
|
||
|
}
|
||
|
|
||
|
exit(0);
|
||
|
}
|