tool/VideoPlayer.git

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			/*
			* copyright (c) 2013 Andrew Kelley
			*
			* 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
			*/

			/**
			* @file
			* libavfilter API usage example.
			*
			* @example filter_audio.c
			* This example will generate a sine wave audio,
			* pass it through a simple filter chain, and then compute the MD5 checksum of
			* the output data.
			*
			* The filter chain it uses is:
			* (input) -> abuffer -> volume -> aformat -> abuffersink -> (output)
			*
			* abuffer: This provides the endpoint where you can feed the decoded samples.
			* volume: In this example we hardcode it to 0.90.
			* aformat: This converts the samples to the samplefreq, channel layout,
			* and sample format required by the audio device.
			* abuffersink: This provides the endpoint where you can read the samples after
			* they have passed through the filter chain.
			*/

			#include <inttypes.h>
			#include <math.h>
			#include <stdio.h>
			#include <stdlib.h>

			#include "libavutil/channel_layout.h"
			#include "libavutil/md5.h"
			#include "libavutil/mem.h"
			#include "libavutil/opt.h"
			#include "libavutil/samplefmt.h"

			#include "libavfilter/avfilter.h"
			#include "libavfilter/buffersink.h"
			#include "libavfilter/buffersrc.h"

			#define INPUT_SAMPLERATE 48000
			#define INPUT_FORMAT AV_SAMPLE_FMT_FLTP
			#define INPUT_CHANNEL_LAYOUT AV_CH_LAYOUT_5POINT0

			#define VOLUME_VAL 0.90

			static int init_filter_graph(AVFilterGraph graph, AVFilterContext src,
			AVFilterContext **sink)
			{
			AVFilterGraph *filter_graph;
			AVFilterContext *abuffer_ctx;
			const AVFilter *abuffer;
			AVFilterContext *volume_ctx;
			const AVFilter *volume;
			AVFilterContext *aformat_ctx;
			const AVFilter *aformat;
			AVFilterContext *abuffersink_ctx;
			const AVFilter *abuffersink;

			AVDictionary *options_dict = NULL;
			uint8_t options_str[1024];
			uint8_t ch_layout[64];

			int err;

			/* Create a new filtergraph, which will contain all the filters. */
			filter_graph = avfilter_graph_alloc();
			if (!filter_graph) {
			fprintf(stderr, "Unable to create filter graph.\n");
			return AVERROR(ENOMEM);
			}

			/* Create the abuffer filter;
			* it will be used for feeding the data into the graph. */
			abuffer = avfilter_get_by_name("abuffer");
			if (!abuffer) {
			fprintf(stderr, "Could not find the abuffer filter.\n");
			return AVERROR_FILTER_NOT_FOUND;
			}

			abuffer_ctx = avfilter_graph_alloc_filter(filter_graph, abuffer, "src");
			if (!abuffer_ctx) {
			fprintf(stderr, "Could not allocate the abuffer instance.\n");
			return AVERROR(ENOMEM);
			}

			/* Set the filter options through the AVOptions API. */
			av_get_channel_layout_string(ch_layout, sizeof(ch_layout), 0, INPUT_CHANNEL_LAYOUT);
			av_opt_set (abuffer_ctx, "channel_layout", ch_layout, AV_OPT_SEARCH_CHILDREN);
			av_opt_set (abuffer_ctx, "sample_fmt", av_get_sample_fmt_name(INPUT_FORMAT), AV_OPT_SEARCH_CHILDREN);
			av_opt_set_q (abuffer_ctx, "time_base", (AVRational){ 1, INPUT_SAMPLERATE }, AV_OPT_SEARCH_CHILDREN);
			av_opt_set_int(abuffer_ctx, "sample_rate", INPUT_SAMPLERATE, AV_OPT_SEARCH_CHILDREN);

			/* Now initialize the filter; we pass NULL options, since we have already
			* set all the options above. */
			err = avfilter_init_str(abuffer_ctx, NULL);
			if (err < 0) {
			fprintf(stderr, "Could not initialize the abuffer filter.\n");
			return err;
			}

			/* Create volume filter. */
			volume = avfilter_get_by_name("volume");
			if (!volume) {
			fprintf(stderr, "Could not find the volume filter.\n");
			return AVERROR_FILTER_NOT_FOUND;
			}

			volume_ctx = avfilter_graph_alloc_filter(filter_graph, volume, "volume");
			if (!volume_ctx) {
			fprintf(stderr, "Could not allocate the volume instance.\n");
			return AVERROR(ENOMEM);
			}

			/* A different way of passing the options is as key/value pairs in a
			* dictionary. */
			av_dict_set(&options_dict, "volume", AV_STRINGIFY(VOLUME_VAL), 0);
			err = avfilter_init_dict(volume_ctx, &options_dict);
			av_dict_free(&options_dict);
			if (err < 0) {
			fprintf(stderr, "Could not initialize the volume filter.\n");
			return err;
			}

			/* Create the aformat filter;
			* it ensures that the output is of the format we want. */
			aformat = avfilter_get_by_name("aformat");
			if (!aformat) {
			fprintf(stderr, "Could not find the aformat filter.\n");
			return AVERROR_FILTER_NOT_FOUND;
			}

			aformat_ctx = avfilter_graph_alloc_filter(filter_graph, aformat, "aformat");
			if (!aformat_ctx) {
			fprintf(stderr, "Could not allocate the aformat instance.\n");
			return AVERROR(ENOMEM);
			}

			/* A third way of passing the options is in a string of the form
			* key1=value1:key2=value2.... */
			snprintf(options_str, sizeof(options_str),
			"sample_fmts=%s:sample_rates=%d:channel_layouts=0x%"PRIx64,
			av_get_sample_fmt_name(AV_SAMPLE_FMT_S16), 44100,
			(uint64_t)AV_CH_LAYOUT_STEREO);
			err = avfilter_init_str(aformat_ctx, options_str);
			if (err < 0) {
			av_log(NULL, AV_LOG_ERROR, "Could not initialize the aformat filter.\n");
			return err;
			}

			/* Finally create the abuffersink filter;
			* it will be used to get the filtered data out of the graph. */
			abuffersink = avfilter_get_by_name("abuffersink");
			if (!abuffersink) {
			fprintf(stderr, "Could not find the abuffersink filter.\n");
			return AVERROR_FILTER_NOT_FOUND;
			}

			abuffersink_ctx = avfilter_graph_alloc_filter(filter_graph, abuffersink, "sink");
			if (!abuffersink_ctx) {
			fprintf(stderr, "Could not allocate the abuffersink instance.\n");
			return AVERROR(ENOMEM);
			}

			/* This filter takes no options. */
			err = avfilter_init_str(abuffersink_ctx, NULL);
			if (err < 0) {
			fprintf(stderr, "Could not initialize the abuffersink instance.\n");
			return err;
			}

			/* Connect the filters;
			* in this simple case the filters just form a linear chain. */
			err = avfilter_link(abuffer_ctx, 0, volume_ctx, 0);
			if (err >= 0)
			err = avfilter_link(volume_ctx, 0, aformat_ctx, 0);
			if (err >= 0)
			err = avfilter_link(aformat_ctx, 0, abuffersink_ctx, 0);
			if (err < 0) {
			fprintf(stderr, "Error connecting filters\n");
			return err;
			}

			/* Configure the graph. */
			err = avfilter_graph_config(filter_graph, NULL);
			if (err < 0) {
			av_log(NULL, AV_LOG_ERROR, "Error configuring the filter graph\n");
			return err;
			}

			*graph = filter_graph;
			*src = abuffer_ctx;
			*sink = abuffersink_ctx;

			return 0;
			}

			/* Do something useful with the filtered data: this simple
			* example just prints the MD5 checksum of each plane to stdout. */
			static int process_output(struct AVMD5 md5, AVFrame frame)
			{
			int planar = av_sample_fmt_is_planar(frame->format);
			int channels = av_get_channel_layout_nb_channels(frame->channel_layout);
			int planes = planar ? channels : 1;
			int bps = av_get_bytes_per_sample(frame->format);
			int plane_size = bps * frame->nb_samples * (planar ? 1 : channels);
			int i, j;

			for (i = 0; i < planes; i++) {
			uint8_t checksum[16];

			av_md5_init(md5);
			av_md5_sum(checksum, frame->extended_data[i], plane_size);

			fprintf(stdout, "plane %d: 0x", i);
			for (j = 0; j < sizeof(checksum); j++)
			fprintf(stdout, "%02X", checksum[j]);
			fprintf(stdout, "\n");
			}
			fprintf(stdout, "\n");

			return 0;
			}

			/* Construct a frame of audio data to be filtered;
			* this simple example just synthesizes a sine wave. */
			static int get_input(AVFrame *frame, int frame_num)
			{
			int err, i, j;

			#define FRAME_SIZE 1024

			/* Set up the frame properties and allocate the buffer for the data. */
			frame->sample_rate = INPUT_SAMPLERATE;
			frame->format = INPUT_FORMAT;
			frame->channel_layout = INPUT_CHANNEL_LAYOUT;
			frame->nb_samples = FRAME_SIZE;
			frame->pts = frame_num * FRAME_SIZE;

			err = av_frame_get_buffer(frame, 0);
			if (err < 0)
			return err;

			/* Fill the data for each channel. */
			for (i = 0; i < 5; i++) {
			float data = (float)frame->extended_data[i];

			for (j = 0; j < frame->nb_samples; j++)
			data[j] = sin(2 * M_PI * (frame_num + j) * (i + 1) / FRAME_SIZE);
			}

			return 0;
			}

			int main(int argc, char *argv[])
			{
			struct AVMD5 *md5;
			AVFilterGraph *graph;
			AVFilterContext src, sink;
			AVFrame *frame;
			uint8_t errstr[1024];
			float duration;
			int err, nb_frames, i;

			if (argc < 2) {
			fprintf(stderr, "Usage: %s <duration>\n", argv[0]);
			return 1;
			}

			duration = atof(argv[1]);
			nb_frames = duration * INPUT_SAMPLERATE / FRAME_SIZE;
			if (nb_frames <= 0) {
			fprintf(stderr, "Invalid duration: %s\n", argv[1]);
			return 1;
			}

			/* Allocate the frame we will be using to store the data. */
			frame = av_frame_alloc();
			if (!frame) {
			fprintf(stderr, "Error allocating the frame\n");
			return 1;
			}

			md5 = av_md5_alloc();
			if (!md5) {
			fprintf(stderr, "Error allocating the MD5 context\n");
			return 1;
			}

			/* Set up the filtergraph. */
			err = init_filter_graph(&graph, &src, &sink);
			if (err < 0) {
			fprintf(stderr, "Unable to init filter graph:");
			goto fail;
			}

			/* the main filtering loop */
			for (i = 0; i < nb_frames; i++) {
			/* get an input frame to be filtered */
			err = get_input(frame, i);
			if (err < 0) {
			fprintf(stderr, "Error generating input frame:");
			goto fail;
			}

			/* Send the frame to the input of the filtergraph. */
			err = av_buffersrc_add_frame(src, frame);
			if (err < 0) {
			av_frame_unref(frame);
			fprintf(stderr, "Error submitting the frame to the filtergraph:");
			goto fail;
			}

			/* Get all the filtered output that is available. */
			while ((err = av_buffersink_get_frame(sink, frame)) >= 0) {
			/* now do something with our filtered frame */
			err = process_output(md5, frame);
			if (err < 0) {
			fprintf(stderr, "Error processing the filtered frame:");
			goto fail;
			}
			av_frame_unref(frame);
			}

			if (err == AVERROR(EAGAIN)) {
			/* Need to feed more frames in. */
			continue;
			} else if (err == AVERROR_EOF) {
			/* Nothing more to do, finish. */
			break;
			} else if (err < 0) {
			/* An error occurred. */
			fprintf(stderr, "Error filtering the data:");
			goto fail;
			}
			}

			avfilter_graph_free(&graph);
			av_frame_free(&frame);
			av_freep(&md5);

			return 0;

			fail:
			av_strerror(err, errstr, sizeof(errstr));
			fprintf(stderr, "%s\n", errstr);
			return 1;
			}