adding an example, without using libtuberia for now

3 files changed, 927 insertions, 0 deletions

diff --git a/example/Makefile.am b/example/Makefile.am
new file mode 100644
index 0000000..f7bee12
--- /dev/null
+++ b/example/Makefile.am
@@ -0,0 +1,7 @@
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+
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+decode_filter_encode_LDADD = ../src/libtuberia.a
+decode_filter_encode_LDFLAGS = -lpthread -lavcodec -lavformat -lavutil -lswscale
+decode_filter_encode_SOURCES = decode_filter_encode.c
+
diff --git a/example/Makefile.in b/example/Makefile.in
new file mode 100644
index 0000000..6cdb8cf
--- /dev/null
+++ b/example/Makefile.in
@@ -0,0 +1,556 @@
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+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
+mostlyclean-generic:
+
+clean-generic:
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+clean: clean-am
+
+clean-am: clean-generic clean-noinstPROGRAMS mostlyclean-am
+
+distclean: distclean-am
+		-rm -f ./$(DEPDIR)/decode_filter_encode-decode_filter_encode.Po
+	-rm -f Makefile
+distclean-am: clean-am distclean-compile distclean-generic \
+	distclean-tags
+
+dvi: dvi-am
+
+dvi-am:
+
+html: html-am
+
+html-am:
+
+info: info-am
+
+info-am:
+
+install-data-am:
+
+install-dvi: install-dvi-am
+
+install-dvi-am:
+
+install-exec-am:
+
+install-html: install-html-am
+
+install-html-am:
+
+install-info: install-info-am
+
+install-info-am:
+
+install-man:
+
+install-pdf: install-pdf-am
+
+install-pdf-am:
+
+install-ps: install-ps-am
+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-am
+		-rm -f ./$(DEPDIR)/decode_filter_encode-decode_filter_encode.Po
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-am
+
+mostlyclean-am: mostlyclean-compile mostlyclean-generic
+
+pdf: pdf-am
+
+pdf-am:
+
+ps: ps-am
+
+ps-am:
+
+uninstall-am:
+
+.MAKE: install-am install-strip
+
+.PHONY: CTAGS GTAGS TAGS all all-am am--depfiles check check-am clean \
+	clean-generic clean-noinstPROGRAMS cscopelist-am ctags \
+	ctags-am distclean distclean-compile distclean-generic \
+	distclean-tags distdir dvi dvi-am html html-am info info-am \
+	install install-am install-data install-data-am install-dvi \
+	install-dvi-am install-exec install-exec-am install-html \
+	install-html-am install-info install-info-am install-man \
+	install-pdf install-pdf-am install-ps install-ps-am \
+	install-strip installcheck installcheck-am installdirs \
+	maintainer-clean maintainer-clean-generic mostlyclean \
+	mostlyclean-compile mostlyclean-generic pdf pdf-am ps ps-am \
+	tags tags-am uninstall uninstall-am
+
+.PRECIOUS: Makefile
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/example/decode_filter_encode.c b/example/decode_filter_encode.c
new file mode 100644
index 0000000..48f31a7
--- /dev/null
+++ b/example/decode_filter_encode.c
@@ -0,0 +1,364 @@
+#include <bits/pthreadtypes.h>
+#include <inttypes.h>
+#include <libavcodec/avcodec.h>
+#include <libavfilter/avfilter.h>
+#include <libavformat/avformat.h>
+#include <libavutil/pixdesc.h>
+#include <libswscale/swscale.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <tuberia.h>
+#include <unistd.h>
+
+const char *optstring = "hi:o:s:T";
+
+static void printhelp(const char *argv0)
+{
+	printf(
+			"%s -i <input> -o <output> -s <size> [-T]\n"
+			"%s -h\n"
+			"\n"
+			" -i input           the input file\n"
+			" -o output          the output file\n"
+			" -s WIDTHxHEIGHT    the size to scale the video\n"
+			" -T                 don't use libtuberia\n"
+			" -h                 print this help\n", argv0, argv0);
+}
+
+static void close_codec(AVCodecContext **ctx)
+{
+	avcodec_free_context(ctx);
+}
+
+static void close_input(AVFormatContext **ctx)
+{
+	avformat_close_input(ctx);
+}
+
+static int open_input(AVFormatContext **avformatin, AVCodecContext **avcodecin,
+		const char *file)
+{
+	AVFormatContext *ctx = NULL;
+	AVCodec *codec = NULL;
+	int i = 0;
+
+	if (avformatin == NULL || avcodecin == NULL || file == NULL || !file[0]) {
+		return -1;
+	}
+
+	printf("Opening input file %s\n", file);
+	if (avformat_open_input(&ctx, file, NULL, NULL)) {
+		return -1;
+	}
+	printf("Parsing input file %s\n", file);
+	if (avformat_find_stream_info(ctx, NULL) < 0) {
+		close_input(&ctx);
+		return -1;
+	}
+
+	for (i = 0; i < (int)ctx->nb_streams; i++) {
+		if (ctx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
+			codec = avcodec_find_decoder(ctx->streams[i]->codecpar->codec_id);
+			if (codec == NULL) {
+				fprintf(stderr, "Couldn't find decoder for codec id %d (%s)\n",
+						ctx->streams[i]->codecpar->codec_id,
+						avcodec_get_name(ctx->streams[i]->codecpar->codec_id));
+				close_input(&ctx);
+				return -1;
+			}
+			printf("Opening input codec %s (%d)\n", avcodec_get_name(codec->id),
+					codec->id);
+			*avcodecin = avcodec_alloc_context3(codec);
+			avcodec_parameters_to_context(*avcodecin, ctx->streams[i]->codecpar);
+			(*avcodecin)->time_base = ctx->streams[i]->time_base;
+			if (avcodec_open2(*avcodecin, codec, NULL) < 0) {
+				fprintf(stderr, "Couldn't open codec %d (%s)\n",
+						ctx->streams[i]->codecpar->codec_id,
+						avcodec_get_name(ctx->streams[i]->codecpar->codec_id));
+				close_input(&ctx);
+				close_codec(avcodecin);
+				return -1;
+			}
+			break;
+		}
+	}
+
+	*avformatin = ctx;
+
+	return 0;
+}
+
+static void close_sws(struct SwsContext **ctx)
+{
+	sws_freeContext(*ctx);
+	*ctx = NULL;
+}
+
+static void close_output(AVFormatContext **ctx)
+{
+	av_write_trailer(*ctx);
+	avformat_flush(*ctx);
+	avio_closep(&(*ctx)->pb);
+	avformat_free_context(*ctx);
+	*ctx = NULL;
+}
+
+static int open_output(AVFormatContext **avformatout,
+		AVCodecContext **avcodecout, struct SwsContext **sws, const char *file,
+		const AVFormatContext *input, int width, int height)
+{
+	AVFormatContext *ctx = NULL;
+	int i = 0;
+	const AVCodec *codec = NULL;
+	const AVCodecParameters *codecparin = NULL;
+	AVStream *stream = NULL;
+
+	if (avformatout == NULL || avcodecout == NULL || input == NULL
+			|| file == NULL || !file[0]) {
+		return -1;
+	}
+	printf("Opening output file %s\n", file);
+	if (avformat_alloc_output_context2(&ctx, NULL, NULL, file) < 0
+			|| ctx == NULL) {
+		return -1;
+	}
+
+	for (i = 0; i < (int)input->nb_streams; i++) {
+		codecparin = input->streams[i]->codecpar;
+		codec = avcodec_find_encoder(codecparin->codec_id);
+		if (codec == NULL) {
+			fprintf(stderr, "Couldn't find encoder for codec id %d (%s)\n",
+				codecparin->codec_id, avcodec_get_name(codecparin->codec_id));
+			close_output(&ctx);
+			return -1;
+		}
+		printf("Opening output codec %s (%d)\n", avcodec_get_name(codec->id),
+				codec->id);
+		stream = avformat_new_stream(ctx, codec);
+		avcodec_parameters_copy(stream->codecpar, codecparin);
+		stream->time_base = input->streams[i]->time_base;
+		if (stream->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
+			stream->codecpar->width = width;
+			stream->codecpar->height = height;
+		}
+		if (stream->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
+			*avcodecout = avcodec_alloc_context3(codec);
+			avcodec_parameters_to_context(*avcodecout, stream->codecpar);
+			(*avcodecout)->time_base = stream->time_base;
+			if (avcodec_open2(*avcodecout, codec, NULL) < 0) {
+				fprintf(stderr, "Couldn't open codec %s (%d)\n",
+						avcodec_get_name(codecparin->codec_id),
+						codecparin->codec_id);
+				close_output(&ctx);
+				close_codec(avcodecout);
+				return -1;
+			}
+			printf("Opening resize context %dx%d %s -> %dx%d %s\n",
+						codecparin->width, codecparin->height,
+						av_get_pix_fmt_name((enum AVPixelFormat)codecparin->format),
+						stream->codecpar->width, stream->codecpar->height,
+						av_get_pix_fmt_name((enum AVPixelFormat)stream->codecpar->format));
+			*sws = sws_getContext(codecparin->width, codecparin->height,
+					(enum AVPixelFormat)codecparin->format,
+					stream->codecpar->width, stream->codecpar->height,
+					(enum AVPixelFormat)stream->codecpar->format,
+					SWS_GAUSS, NULL, NULL, NULL);
+			if (*sws == NULL) {
+				fprintf(stderr, "Couldn't open resize context %dx%d %s -> %dx%d %s\n",
+						codecparin->width, codecparin->height,
+						av_get_pix_fmt_name((enum AVPixelFormat)codecparin->format),
+						stream->codecpar->width, stream->codecpar->height,
+						av_get_pix_fmt_name((enum AVPixelFormat)stream->codecpar->format));
+				close_output(&ctx);
+				close_codec(avcodecout);
+				close_sws(sws);
+			}
+		}
+	}
+
+	if (!(ctx->flags & AVFMT_NOFILE)) {
+		int ret = avio_open(&ctx->pb, file, AVIO_FLAG_WRITE);
+		if (ret < 0) {
+			fprintf(stderr, "Couldn't create output file %s %s (%d)\n", file,
+					av_err2str(ret), ret);
+			close_output(&ctx);
+			close_codec(avcodecout);
+			close_sws(sws);
+			return -1;
+		}
+	}
+	if (avformat_write_header(ctx, NULL) < 0) {
+		fprintf(stderr, "Couldn't write header to output file %s\n", file);
+	}
+	*avformatout = ctx;
+	return 0;
+}
+
+static void do_tuberia(AVFormatContext *avformatin, AVCodecContext *avcodecin,
+		AVFormatContext *avformatout, struct SwsContext *sws,
+		AVCodecContext *avcodecout)
+{
+	//TODO
+	(void)avformatin;
+	(void)avcodecin;
+	(void)avformatout;
+	(void)avcodecout;
+	(void)sws;
+	printf("Starting to transcode with libtuberia\n");
+	printf("Transcode with libtuberia finished\n");
+}
+
+static int decode_packet(AVCodecContext *ctx, AVPacket *packet, AVFrame *frame)
+{
+	int ret = 0;
+	ret = avcodec_send_packet(ctx, packet);
+	av_packet_unref(packet);
+	if (!ret) {
+		ret = avcodec_receive_frame(ctx, frame);
+	} else {
+		fprintf(stderr, "Couldn't decode video packet\n");
+	}
+
+	return ret;
+}
+
+static int scale_frame(struct SwsContext *sws, AVFrame *frame, AVFrame *scaled,
+		int width, int height, enum AVPixelFormat pix_fmt)
+{
+	av_frame_copy_props(scaled, frame);
+	scaled->width = width;
+	scaled->height = height;
+	scaled->format = pix_fmt;
+	av_frame_get_buffer(scaled, 0);
+	sws_scale(sws, (const uint8_t * const *)frame->data, frame->linesize,
+			0, frame->height, scaled->data, scaled->linesize);
+	av_frame_unref(frame);
+
+	return 0;
+}
+
+static int encode_frame(AVCodecContext *ctx, AVFrame *frame, AVPacket *packet)
+{
+	int ret = 0;
+
+	ret = avcodec_send_frame(ctx, frame);
+	av_frame_unref(frame);
+	if (!ret) {
+		ret = avcodec_receive_packet(ctx, packet);
+	} else {
+		fprintf(stderr, "Couldn't encode video packet\n");
+	}
+
+	return ret;
+}
+
+static void do_no_tuberia(AVFormatContext *avformatin, AVCodecContext *avcodecin,
+		AVFormatContext *avformatout, struct SwsContext *sws,
+		AVCodecContext *avcodecout)
+{
+	AVPacket *packet = NULL;
+	AVFrame *frame = NULL;
+	AVFrame *scaled = NULL;
+	int idx = 0;
+
+	printf("Starting to transcode without libtuberia\n");
+
+	packet = av_packet_alloc();
+	frame = av_frame_alloc();
+	scaled = av_frame_alloc();
+	while (!av_read_frame(avformatin, packet)) {
+		idx = packet->stream_index;
+		if (avformatin->streams[idx]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
+			if (decode_packet(avcodecin, packet, frame)) {
+				continue;
+			}
+			scale_frame(sws, frame, scaled, avcodecout->width,
+					avcodecout->height, avcodecout->pix_fmt);
+			if (encode_frame(avcodecout, scaled, packet)) {
+				continue;
+			}
+			packet->stream_index = idx;
+		}
+		av_packet_rescale_ts(packet, avformatin->streams[idx]->time_base,
+				avformatout->streams[idx]->time_base);
+		av_interleaved_write_frame(avformatout, packet);
+	}
+	av_packet_free(&packet);
+	av_frame_free(&frame);
+	av_frame_free(&scaled);
+
+	printf("Transcode without libtuberia finished\n");
+}
+
+int main(int argc, char **argv)
+{
+	int c = 0;
+	char *input = NULL;
+	char *output = NULL;
+	int width = 720;
+	int height = 404;
+	int notuberia = 0;
+	AVFormatContext *avformatin = NULL;
+	AVFormatContext *avformatout = NULL;
+	AVCodecContext *avcodecin = NULL;
+	AVCodecContext *avcodecout = NULL;
+	struct SwsContext *sws = NULL;
+
+	while ((c = getopt(argc, argv, optstring)) >= 0) {
+		switch (c) {
+			case 'h':
+				printhelp(argv[0]);
+				return 0;
+				break;
+			case 'i':
+				input = optarg;
+				break;
+			case 'o':
+				output = optarg;
+				break;
+			case 's':
+				if (sscanf(optarg, "%dx%d", &width, &height) != 2) {
+					fprintf(stderr, "Size parameter must be WxH, instead it is %s\n",
+							optarg);
+					return -1;
+				}
+				break;
+			case 'T':
+				notuberia = 1;
+				break;
+			case '?':
+			default:
+				fprintf(stderr, "Incorrect arguments. Run %s -h\n", argv[0]);
+				return -1;
+		}
+	}
+	if (input == NULL || !input[0]) {
+		printhelp(argv[0]);
+		return -1;
+	}
+
+	if (open_input(&avformatin, &avcodecin, input) < 0) {
+		fprintf(stderr, "Couldn't open input %s\n", input);
+		return -1;
+	}
+	if (open_output(&avformatout, &avcodecout, &sws, output, avformatin, width,
+				height) < 0) {
+		fprintf(stderr, "Couldn't initiate output %s\n", output);
+		return -1;
+	}
+
+	if (notuberia) {
+		do_no_tuberia(avformatin, avcodecin, avformatout, sws, avcodecout);
+	} else {
+		do_tuberia(avformatin, avcodecin, avformatout, sws, avcodecout);
+	}
+
+	close_input(&avformatin);
+	close_output(&avformatout);
+	close_codec(&avcodecin);
+	close_codec(&avcodecout);
+	close_sws(&sws);
+
+	return 0;
+}
+