transcode.c 12.6 KB
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#include <stdio.h>
#include <unistd.h>
#include <libavutil/opt.h>
#include <libavcodec/avcodec.h>
#include <libavformat/avformat.h>
#include <libavfilter/avfilter.h>
#include <libavfilter/buffersink.h>
#include <libavfilter/buffersrc.h>

#include "util.h"

void assert_empty_opts(AVDictionary *opts)
{
	AVDictionaryEntry *e;
	e = 0;
	while (e = av_dict_get(opts, "", e, AV_DICT_IGNORE_SUFFIX))
		job_failed("Unrecognized option: %s", e->key);
}

static void setup_input_stream(char *stream, AVFormatContext *demux,
		AVCodecContext **decs, AVFilterGraph *fg, AVFilterContext **srcs,
		AVFilterInOut **pads)
{
	char *p;
	int idx, err;
	enum AVMediaType type;
	AVDictionary *opts;
	AVFilterInOut *_inpads;
	AVFilterInOut *_outpads;
	type = AVMEDIA_TYPE_VIDEO;
	if (!strcmp(jstr(jlookup(stream, "type"), ""), "audio"))
		type = AVMEDIA_TYPE_AUDIO;
	idx = av_find_best_stream(demux, type, jint(jlookup(stream, "index"), -1), -1, 0, 0);
	if ((idx == -1 || decs[idx]) && jint(jlookup(stream, "index"), -1) == -1)
		for (idx = 0; idx < demux->nb_streams
				&& (decs[idx] || demux->streams[idx]->codecpar->codec_type == type); idx ++);
	if (idx == -1 || decs[idx])
		job_failed("Could not find suitable input stream");

	/* Prepare Decoder */
	decs[idx] = avcodec_alloc_context3(avcodec_find_decoder(demux->streams[idx]->codecpar->codec_id));
	if (!decs[idx])
		job_failed("Could not allocate decoder context");
	avcodec_parameters_to_context(decs[idx], demux->streams[idx]->codecpar);
	opts = 0;
	parse_dict(&opts, jlookup(stream, "options"));
	if ((err = avcodec_open2(decs[idx], decs[idx]->codec, &opts)) < 0)
		job_failed("Opening decoder failed: %s", av_err2str(err));
	assert_empty_opts(opts);

	/* Prepare Filter Source */
	if (type == AVMEDIA_TYPE_VIDEO)
	{
		p = mprintf("video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:pixel_aspect=%d/%d",
			decs[idx]->width, decs[idx]->height, decs[idx]->pix_fmt,
			demux->streams[idx]->time_base.num, demux->streams[idx]->time_base.den,
			decs[idx]->sample_aspect_ratio.num, decs[idx]->sample_aspect_ratio.den);
		err = avfilter_graph_create_filter(&srcs[idx],
				avfilter_get_by_name("buffer"), 0, p, 0, fg);
		if (err < 0)
			job_failed("Creating buffer source failed: %s", av_err2str(err));
		free(p);
	}
	else if (type == AVMEDIA_TYPE_AUDIO)
	{
		p = mprintf("time_base=%d/%d:sample_rate=%d:sample_fmt=%d:channel_layout=%d:channels=%d",
			demux->streams[idx]->time_base.num, demux->streams[idx]->time_base.den,
			decs[idx]->sample_rate, decs[idx]->sample_fmt, decs[idx]->channel_layout,
			decs[idx]->channels);
		err = avfilter_graph_create_filter(&srcs[idx],
				avfilter_get_by_name("abuffer"), 0, p, 0, fg);
		if (err < 0)
			job_failed("Creating abuffer source failed: %s", av_err2str(err));
		free(p);
	}
	for (; *pads; pads = &(*pads)->next);
	*pads = avfilter_inout_alloc();
	(*pads)->filter_ctx = srcs[idx];
	(*pads)->pad_idx = 0;
	(*pads)->next = 0;
	for (p = jenter(jlookup(stream, "filters")); p; p = jnext(p))
	{
		(*pads)->name = av_strdup("in");
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		if ((err = avfilter_graph_parse_ptr(fg, jstr(p, "ERROR"), 0, pads, 0)) < 0)
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			job_failed("Parsing filter string \"%s\" failed: %s", jstr(p, 0), av_err2str(err));
		if ((*pads)->next)
			job_failed("Unconnected filter pad\n");
	}
	(*pads)->name = av_strdup(jstr(jlookup(stream, "name"), "unknown"));
}

static void prepare_output_stream(char *stream, AVStream *st,
		AVCodecContext **encs, AVFilterGraph *fg, AVFilterContext **sinks,
		AVFilterInOut **pads)
{
	int idx, err;
	char *p;
	AVFilterInOut *_inpads;
	AVFilterInOut *_outpads;
	idx = st->index;
	encs[idx] = avcodec_alloc_context3(avcodec_find_encoder_by_name(
				jstr(jlookup(stream, "codec"), 0)));
	if (!encs[idx])
		job_failed("Could not allocate decoder context");

	/* Prepare Filter Sink */
	if (encs[idx]->codec_type == AVMEDIA_TYPE_VIDEO)
	{
		err = avfilter_graph_create_filter(&sinks[idx],
				avfilter_get_by_name("buffersink"), 0, 0, 0, fg);
		if (err < 0)
			job_failed("Creating buffer sink failed: %s", av_err2str(err));
		av_opt_set_int_list(sinks[idx], "pix_fmts", encs[idx]->codec->pix_fmts,
				AV_PIX_FMT_NONE, AV_OPT_SEARCH_CHILDREN);
	}
	else if (encs[idx]->codec_type == AVMEDIA_TYPE_AUDIO)
	{
		err = avfilter_graph_create_filter(&sinks[idx],
				avfilter_get_by_name("abuffersink"), 0, 0, 0, fg);
		if (err < 0)
			job_failed("Creating abuffer sink failed: %s", av_err2str(err));
		av_opt_set_int_list(sinks[idx], "sample_fmts", encs[idx]->codec->sample_fmts,
				AV_SAMPLE_FMT_NONE, AV_OPT_SEARCH_CHILDREN);
		av_opt_set_int_list(sinks[idx], "sample_rates",
				encs[idx]->codec->supported_samplerates, 0, AV_OPT_SEARCH_CHILDREN);
		av_opt_set_int_list(sinks[idx], "channel_layouts",
				encs[idx]->codec->channel_layouts, 0, AV_OPT_SEARCH_CHILDREN);
	}
	else
		job_failed("Requested codec has unsupported type\n");
	for (; *pads; pads = &(*pads)->next);
	*pads = avfilter_inout_alloc();
	(*pads)->filter_ctx = sinks[idx];
	(*pads)->pad_idx = 0;
	(*pads)->next = 0;
	for (p = jenter(jlookup(stream, "filters")); p; p = jnext(p))
	{
		(*pads)->name = av_strdup("out");
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		if ((err = avfilter_graph_parse_ptr(fg, jstr(p, "ERROR"), pads, 0, 0)) < 0)
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			job_failed("Parsing filter string \"%s\" failed: %s", jstr(p, 0), av_err2str(err));
		if ((*pads)->next)
			job_failed("Unconnected filter pad\n");
	}
	(*pads)->name = av_strdup(jstr(jlookup(stream, "name"), "unknown"));
}

static void setup_output_stream(char *stream, AVStream *st, AVCodecContext *enc,
		AVFilterContext *sink)
{
	int err;
	AVDictionary *opts;
	if (enc->codec_type == AVMEDIA_TYPE_VIDEO)
	{
		/* Why not use av_buffersink_get_* here? */
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		enc->height = av_buffersink_get_h(sink);
		enc->width = av_buffersink_get_w(sink);
		enc->sample_aspect_ratio = av_buffersink_get_sample_aspect_ratio(sink);
		enc->pix_fmt = av_buffersink_get_format(sink);
		enc->framerate = av_buffersink_get_frame_rate(sink);
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	}
	else if (enc->codec_type == AVMEDIA_TYPE_AUDIO)
	{
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		enc->sample_rate = av_buffersink_get_sample_rate(sink);
		enc->channel_layout = av_buffersink_get_channel_layout(sink);
		enc->channels = av_buffersink_get_channels(sink);
		enc->sample_fmt = av_buffersink_get_format(sink);
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	}
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	enc->time_base = av_buffersink_get_time_base(sink);
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	opts = 0;
	parse_dict(&opts, jlookup(stream, "options"));
	if ((err = avcodec_open2(enc, enc->codec, &opts)) < 0)
		job_failed("Opening encoder failed: %s", av_err2str(err));
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	if (enc->codec_type == AVMEDIA_TYPE_AUDIO &&
			!(enc->codec->capabilities & AV_CODEC_CAP_VARIABLE_FRAME_SIZE && enc->frame_size))
		av_buffersink_set_frame_size(sink, enc->frame_size);
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	assert_empty_opts(opts);
	avcodec_parameters_from_context(st->codecpar, enc);
}

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static void flush_encoder(AVFormatContext *mux, AVFilterContext *sink, AVCodecContext *enc, int idx)
{
	int err;
	AVPacket pkt;
	pkt.data = 0;
	pkt.size = 0;
	av_init_packet(&pkt);
	while (!avcodec_receive_packet(enc, &pkt))
	{
		pkt.stream_index = idx;
		av_packet_rescale_ts(&pkt, sink->inputs[0]->time_base,
				mux->streams[idx]->time_base);
		if (err = av_interleaved_write_frame(mux, &pkt))
			job_failed("Could not write frame: %s", av_err2str(err));
	}
}

static void flush_filtergraph(AVFormatContext *mux, AVFilterContext **sinks, AVCodecContext **encs)
{
	int i;
	AVFrame *frame;
	if (!(frame = av_frame_alloc()))
		exit(99);
	for (i = 0; i < mux->nb_streams; i ++)
		while (av_buffersink_get_frame(sinks[i], frame) >= 0)
		{
			avcodec_send_frame(encs[i], frame);
			av_frame_unref(frame);
			flush_encoder(mux, sinks[i], encs[i], i);
		}
	av_frame_free(&frame);
}

static void filtergraph_send(AVFilterContext *src, AVCodecContext *dec, AVPacket *pkt)
{
	int err;
	AVFrame *frame;
	if (!dec || !src)
		return;
	if (!(frame = av_frame_alloc()))
		exit(99);
	avcodec_send_packet(dec, pkt);
	while (!avcodec_receive_frame(dec, frame))
		if ((err = av_buffersrc_add_frame(src, frame)) < 0)
			job_failed("Could not insert frame into filter graph: %s", av_err2str(err));
	av_frame_free(&frame);
}

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void connect_pads(AVFilterInOut **ins, AVFilterInOut **outs)
{
	int err;
	AVFilterInOut *in, *out;
	/* TODO: Really remove matched pads from ins/outs */
	for (in = *ins; in; in = in->next)
	{
		if (!in->name)
			continue;
		for (out = *outs; out && (!out->name || strcmp(in->name, out->name));
				out = out->next);
		if (!out)
			continue;
		if ((err = avfilter_link(in->filter_ctx, in->pad_idx, out->filter_ctx, out->pad_idx)) < 0)
			job_failed("Could not connect remaining filter pads named \"%s\": %s", in->name, av_err2str(err));
		out->name = 0;
	}
}

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int main(int argc, char *argv[])
{
	int err, i, progress, _progress;
	char *p, *input, *output, *inpath, *outpath, *tmppath;
	AVFormatContext *demux, *mux;
	AVCodecContext **decs, **encs;
	AVFilterContext **srcs, **sinks;
	AVFilterGraph *fg;
	AVFilterInOut *inpads, *outpads;
	AVPacket pkt;
	AVStream *stream;
	AVDictionary *opts;
	if (argc != 5)
		return 1;
	av_register_all();
	avfilter_register_all();
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	init_env();
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	init_avlogbuf();
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	pkt.data = 0;
	pkt.size = 0;
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	av_init_packet(&pkt);
	if (!(fg = avfilter_graph_alloc()))
		return 99;

	jobid = atoi(argv[1]);
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	ping_job(jobid, "running", 0);
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	input = jlookup(argv[4], "input");
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	inpath = buildpath(getenv(WORKER_RAW), jstr(jlookup(input, "path"), 0));
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	output = jlookup(argv[4], "output");
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	outpath = buildpath(getenv(WORKER_RELEASED), jstr(jlookup(output, "path"), 0));
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	tmppath = mprintf("%s/.tmp-%i", getenv(WORKER_TMP), jobid);
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	overwrite_check(outpath, inpath, jstr(jlookup(input, "hash"), ""));
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	demux = 0;
	opts = 0;
	parse_dict(&opts, jlookup(input, "options"));
	if (err = avformat_open_input(&demux, inpath, 0, &opts))
		job_failed("Opening input file failed: %s", av_err2str(err));
	assert_empty_opts(opts);
	avformat_find_stream_info(demux, 0);
	decs = xmalloc(sizeof(AVCodecContext *)*demux->nb_streams);
	srcs = xmalloc(sizeof(AVFilterContext *)*demux->nb_streams);
	inpads = 0;
	for (p = jenter(jlookup(input, "streams")); p; p = jnext(p))
		setup_input_stream(p, demux, decs, fg, srcs, &inpads);

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	err = avformat_alloc_output_context2(&mux,
			av_guess_format(jstr(jlookup(output, "format"), 0), outpath, 0), 0,
			tmppath);
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	if (err < 0)
		job_failed("Error allocating muxer context: %s", av_err2str(err));
	parse_dict(&mux->metadata, jlookup(output, "metadata"));
	parse_chapters(mux, jlookup(output, "chapters"), demux->duration);
	for (i = 0, p = jenter(jlookup(output, "streams")); p; i ++, p = jnext(p));
	sinks = xmalloc(sizeof(AVFilterContext *)*i);
	encs = xmalloc(sizeof(AVCodecContext *)*i);
	outpads = 0;
	for (i = 0, p = jenter(jlookup(output, "streams")); p; i ++, p = jnext(p))
		prepare_output_stream(p, avformat_new_stream(mux, 0), encs, fg, sinks, &outpads);

	for (p = jenter(jlookup(argv[4], "filters")); p; p = jnext(p))
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		if ((err = avfilter_graph_parse_ptr(fg, jstr(p, "ERROR"), &outpads, &inpads, 0)) < 0)
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			job_failed("Parsing filter string \"%s\" failed: %s", jstr(p, 0), av_err2str(err));
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	connect_pads(&inpads, &outpads);
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	if (avfilter_graph_config(fg, 0) < 0)
		job_failed("Error configuring filter graph: %s", av_err2str(err));

	for (i = 0, p = jenter(jlookup(output, "streams")); p; i ++, p = jnext(p))
		setup_output_stream(p, mux->streams[i], encs[i], sinks[i]);
	if ((err = avio_open(&mux->pb, tmppath, AVIO_FLAG_WRITE)) < 0)
		job_failed("Opening temporary file \"%s\" failed: %s", tmppath, av_err2str(err));
	opts = 0;
	parse_dict(&opts, jlookup(output, "options"));
	if ((err = avformat_write_header(mux, &opts)) < 0)
		job_failed("Writing temporary file failed: %s", av_err2str(err));
	assert_empty_opts(opts);

	progress = 0;
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	ping_job(jobid, "running", 0);
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	while (!av_read_frame(demux, &pkt))
	{
		i = pkt.stream_index;
		_progress = av_rescale_q(pkt.pts, demux->streams[i]->time_base, AV_TIME_BASE_Q)*100/demux->duration;
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		if (_progress > progress || !checktime(30))
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		{
			ping_job(jobid, "running", "{\"progress\": %i, \"log\": \"%s\"}", _progress,
					jescape(get_avlogbuf()));
			progress = _progress;
		}
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		filtergraph_send(srcs[i], decs[i], &pkt);
		flush_filtergraph(mux, sinks, encs);
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	}

	/* Flush */
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	for (i = 0; i < demux->nb_streams; i ++)
	{
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		if (!decs[i] || !srcs[i])
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			continue;
		filtergraph_send(srcs[i], decs[i], 0);
		!av_buffersrc_add_frame(srcs[i], 0);
	}
	flush_filtergraph(mux, sinks, encs);
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	for (i = 0; i < mux->nb_streams; i ++)
	{
		avcodec_send_frame(encs[i], 0);
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		flush_encoder(mux, sinks[i], encs[i], i);
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	}
	av_interleaved_write_frame(mux, 0);
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	avformat_close_input(&demux);
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	if (err = av_write_trailer(mux))
		job_failed("Error writing trailer to temporary file", av_err2str(err));
	avio_closep(&mux->pb);
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	if (!filesize(tmppath))
		job_failed("Sanity check failed: Output file is empty");
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	overwrite_check(outpath, 0, 0);
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	if (rename(tmppath, outpath))
		job_failed("Overwriting output file \"%s\" failed: %s", outpath, strerror(errno));
	unlink(tmppath);
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	ping_job(jobid, "finished", "{%s, \"log\": \"%s\"}", json_fileinfo(outpath),
			jescape(get_avlogbuf()));
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	return 0;
}