/**************************************************************************/
/*  video_stream_theora.cpp                                               */
/**************************************************************************/
/*                         This file is part of:                          */
/*                             GODOT ENGINE                               */
/*                        https://godotengine.org                         */
/**************************************************************************/
/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
/*                                                                        */
/* 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.                 */
/**************************************************************************/

#include "video_stream_theora.h"

#include "core/config/project_settings.h"
#include "core/io/image.h"
#include "scene/resources/image_texture.h"

#include "thirdparty/misc/yuv2rgb.h"

int VideoStreamPlaybackTheora::buffer_data() {
	char *buffer = ogg_sync_buffer(&oy, 4096);

	uint64_t bytes = file->get_buffer((uint8_t *)buffer, 4096);
	ogg_sync_wrote(&oy, bytes);
	return (bytes);
}

int VideoStreamPlaybackTheora::queue_page(ogg_page *page) {
	if (theora_p) {
		ogg_stream_pagein(&to, page);
		if (to.e_o_s) {
			theora_eos = true;
		}
	}
	if (vorbis_p) {
		ogg_stream_pagein(&vo, page);
		if (vo.e_o_s) {
			vorbis_eos = true;
		}
	}
	return 0;
}

void VideoStreamPlaybackTheora::video_write(th_ycbcr_buffer yuv) {
	uint8_t *w = frame_data.ptrw();
	char *dst = (char *)w;
	uint32_t y_offset = region.position.y * yuv[0].stride + region.position.x;
	uint32_t uv_offset = region.position.y * yuv[1].stride + region.position.x;

	if (px_fmt == TH_PF_444) {
		yuv444_2_rgb8888((uint8_t *)dst, (uint8_t *)yuv[0].data + y_offset, (uint8_t *)yuv[1].data + uv_offset, (uint8_t *)yuv[2].data + uv_offset, region.size.x, region.size.y, yuv[0].stride, yuv[1].stride, region.size.x << 2);
	} else if (px_fmt == TH_PF_422) {
		yuv422_2_rgb8888((uint8_t *)dst, (uint8_t *)yuv[0].data + y_offset, (uint8_t *)yuv[1].data + uv_offset, (uint8_t *)yuv[2].data + uv_offset, region.size.x, region.size.y, yuv[0].stride, yuv[1].stride, region.size.x << 2);
	} else if (px_fmt == TH_PF_420) {
		yuv420_2_rgb8888((uint8_t *)dst, (uint8_t *)yuv[0].data + y_offset, (uint8_t *)yuv[1].data + uv_offset, (uint8_t *)yuv[2].data + uv_offset, region.size.x, region.size.y, yuv[0].stride, yuv[1].stride, region.size.x << 2);
	}

	Ref<Image> img;
	img.instantiate(region.size.x, region.size.y, false, Image::FORMAT_RGBA8, frame_data); //zero copy image creation

	texture->update(img); //zero copy send to rendering server
}

void VideoStreamPlaybackTheora::clear() {
	if (file.is_null()) {
		return;
	}

	if (vorbis_p) {
		ogg_stream_clear(&vo);
		if (vorbis_p >= 3) {
			vorbis_block_clear(&vb);
			vorbis_dsp_clear(&vd);
		}
		vorbis_comment_clear(&vc);
		vorbis_info_clear(&vi);
		vorbis_p = 0;
	}
	if (theora_p) {
		ogg_stream_clear(&to);
		th_decode_free(td);
		th_comment_clear(&tc);
		th_info_clear(&ti);
		theora_p = 0;
	}
	ogg_sync_clear(&oy);

	theora_p = 0;
	vorbis_p = 0;
	next_frame_time = 0;
	current_frame_time = 0;
	theora_eos = false;
	vorbis_eos = false;
	video_ready = false;
	video_done = false;
	audio_done = false;

	file.unref();
	playing = false;
}

void VideoStreamPlaybackTheora::set_file(const String &p_file) {
	ERR_FAIL_COND(playing);
	ogg_packet op;
	th_setup_info *ts = nullptr;

	file_name = p_file;
	file = FileAccess::open(p_file, FileAccess::READ);
	ERR_FAIL_COND_MSG(file.is_null(), "Cannot open file '" + p_file + "'.");

	ogg_sync_init(&oy);

	/* init supporting Vorbis structures needed in header parsing */
	vorbis_info_init(&vi);
	vorbis_comment_init(&vc);

	/* init supporting Theora structures needed in header parsing */
	th_comment_init(&tc);
	th_info_init(&ti);

	theora_eos = false;
	vorbis_eos = false;

	/* Ogg file open; parse the headers */
	/* Only interested in Vorbis/Theora streams */
	int stateflag = 0;

	int audio_track_skip = audio_track;

	while (!stateflag) {
		int ret = buffer_data();
		if (ret == 0) {
			break;
		}
		while (ogg_sync_pageout(&oy, &og) > 0) {
			ogg_stream_state test;

			/* is this a mandated initial header? If not, stop parsing */
			if (!ogg_page_bos(&og)) {
				/* don't leak the page; get it into the appropriate stream */
				queue_page(&og);
				stateflag = 1;
				break;
			}

			ogg_stream_init(&test, ogg_page_serialno(&og));
			ogg_stream_pagein(&test, &og);
			ogg_stream_packetout(&test, &op);

			/* identify the codec: try theora */
			if (!theora_p && th_decode_headerin(&ti, &tc, &ts, &op) >= 0) {
				/* it is theora */
				memcpy(&to, &test, sizeof(test));
				theora_p = 1;
			} else if (!vorbis_p && vorbis_synthesis_headerin(&vi, &vc, &op) >= 0) {
				/* it is vorbis */
				if (audio_track_skip) {
					vorbis_info_clear(&vi);
					vorbis_comment_clear(&vc);
					ogg_stream_clear(&test);
					vorbis_info_init(&vi);
					vorbis_comment_init(&vc);

					audio_track_skip--;
				} else {
					memcpy(&vo, &test, sizeof(test));
					vorbis_p = 1;
				}
			} else {
				/* whatever it is, we don't care about it */
				ogg_stream_clear(&test);
			}
		}
		/* fall through to non-bos page parsing */
	}

	/* we're expecting more header packets. */
	while ((theora_p && theora_p < 3) || (vorbis_p && vorbis_p < 3)) {
		int ret = 0;

		/* look for further theora headers */
		if (theora_p && theora_p < 3) {
			ret = ogg_stream_packetout(&to, &op);
		}
		while (theora_p && theora_p < 3 && ret) {
			if (ret < 0) {
				fprintf(stderr, "Error parsing Theora stream headers; corrupt stream?\n");
				clear();
				return;
			}
			if (!th_decode_headerin(&ti, &tc, &ts, &op)) {
				fprintf(stderr, "Error parsing Theora stream headers; corrupt stream?\n");
				clear();
				return;
			}
			ret = ogg_stream_packetout(&to, &op);
			theora_p++;
		}

		/* look for more vorbis header packets */
		if (vorbis_p && vorbis_p < 3) {
			ret = ogg_stream_packetout(&vo, &op);
		}
		while (vorbis_p && vorbis_p < 3 && ret) {
			if (ret < 0) {
				fprintf(stderr, "Error parsing Vorbis stream headers; corrupt stream?\n");
				clear();
				return;
			}
			ret = vorbis_synthesis_headerin(&vi, &vc, &op);
			if (ret) {
				fprintf(stderr, "Error parsing Vorbis stream headers; corrupt stream?\n");
				clear();
				return;
			}
			vorbis_p++;
			if (vorbis_p == 3) {
				break;
			}
			ret = ogg_stream_packetout(&vo, &op);
		}

		/* The header pages/packets will arrive before anything else we
		care about, or the stream is not obeying spec */

		if (ogg_sync_pageout(&oy, &og) > 0) {
			queue_page(&og); /* demux into the appropriate stream */
		} else {
			int ret2 = buffer_data(); /* someone needs more data */
			if (ret2 == 0) {
				fprintf(stderr, "End of file while searching for codec headers.\n");
				clear();
				return;
			}
		}
	}

	/* And now we have it all. Initialize decoders. */
	if (theora_p) {
		td = th_decode_alloc(&ti, ts);
		px_fmt = ti.pixel_fmt;
		switch (ti.pixel_fmt) {
			case TH_PF_420:
				//printf(" 4:2:0 video\n");
				break;
			case TH_PF_422:
				//printf(" 4:2:2 video\n");
				break;
			case TH_PF_444:
				//printf(" 4:4:4 video\n");
				break;
			case TH_PF_RSVD:
			default:
				printf(" video\n  (UNKNOWN Chroma sampling!)\n");
				break;
		}
		th_decode_ctl(td, TH_DECCTL_GET_PPLEVEL_MAX, &pp_level_max,
				sizeof(pp_level_max));
		pp_level = 0;
		th_decode_ctl(td, TH_DECCTL_SET_PPLEVEL, &pp_level, sizeof(pp_level));
		pp_inc = 0;

		size.x = ti.frame_width;
		size.y = ti.frame_height;
		region.position.x = ti.pic_x;
		region.position.y = ti.pic_y;
		region.size.x = ti.pic_width;
		region.size.y = ti.pic_height;

		Ref<Image> img = Image::create_empty(region.size.x, region.size.y, false, Image::FORMAT_RGBA8);
		texture->set_image(img);
		frame_data.resize(region.size.x * region.size.y * 4);

		frame_duration = (double)ti.fps_denominator / ti.fps_numerator;
	} else {
		/* tear down the partial theora setup */
		th_info_clear(&ti);
		th_comment_clear(&tc);
	}

	th_setup_free(ts);

	if (vorbis_p) {
		vorbis_synthesis_init(&vd, &vi);
		vorbis_block_init(&vd, &vb);
		//_setup(vi.channels, vi.rate);
	} else {
		/* tear down the partial vorbis setup */
		vorbis_info_clear(&vi);
		vorbis_comment_clear(&vc);
	}

	playing = false;
	buffering = true;
	time = 0;
	video_done = !theora_p;
	audio_done = !vorbis_p;
}

double VideoStreamPlaybackTheora::get_time() const {
	// FIXME: AudioServer output latency was fixed in af9bb0e, previously it used to
	// systematically return 0. Now that it gives a proper latency, it broke this
	// code where the delay compensation likely never really worked.
	return time - /* AudioServer::get_singleton()->get_output_latency() - */ delay_compensation;
}

Ref<Texture2D> VideoStreamPlaybackTheora::get_texture() const {
	return texture;
}

void VideoStreamPlaybackTheora::update(double p_delta) {
	if (file.is_null()) {
		return;
	}

	if (!playing || paused) {
		return;
	}

	time += p_delta;

	double comp_time = get_time();
	bool audio_ready = false;

	// Read data until we fill the audio buffer and get a new video frame.
	while ((!audio_ready && !audio_done) || (!video_ready && !video_done)) {
		ogg_packet op;

		while (!audio_ready && !audio_done) {
			float **pcm;
			int ret = vorbis_synthesis_pcmout(&vd, &pcm);
			if (ret > 0) {
				const int AUXBUF_LEN = 4096;
				int to_read = ret;
				float aux_buffer[AUXBUF_LEN];
				while (to_read) {
					int m = MIN(AUXBUF_LEN / vi.channels, to_read);
					int count = 0;
					for (int j = 0; j < m; j++) {
						for (int i = 0; i < vi.channels; i++) {
							aux_buffer[count++] = pcm[i][j];
						}
					}
					int mixed = mix_callback(mix_udata, aux_buffer, m);
					to_read -= mixed;
					if (mixed != m) { //could mix no more
						audio_ready = true;
						break;
					}
				}
				vorbis_synthesis_read(&vd, ret - to_read);
			} else {
				/* no pending audio; is there a pending packet to decode? */
				if (ogg_stream_packetout(&vo, &op) > 0) {
					if (vorbis_synthesis(&vb, &op) == 0) { /* test for success! */
						vorbis_synthesis_blockin(&vd, &vb);
					}
				} else { /* we need more data; break out to suck in another page */
					audio_done = vorbis_eos;
					break;
				}
			}
		}

		while (!video_ready && !video_done) {
			if (ogg_stream_packetout(&to, &op) > 0) {
				/*HACK: This should be set after a seek or a gap, but we might not have
				a granulepos for the first packet (we only have them for the last
				packet on a page), so we just set it as often as we get it.
				To do this right, we should back-track from the last packet on the
				page and compute the correct granulepos for the first packet after
				a seek or a gap.*/
				if (op.granulepos >= 0) {
					th_decode_ctl(td, TH_DECCTL_SET_GRANPOS, &op.granulepos,
							sizeof(op.granulepos));
				}
				ogg_int64_t videobuf_granulepos;
				int ret = th_decode_packetin(td, &op, &videobuf_granulepos);
				if (ret == 0 || ret == TH_DUPFRAME) {
					next_frame_time = th_granule_time(td, videobuf_granulepos);
					if (next_frame_time > comp_time) {
						dup_frame = (ret == TH_DUPFRAME);
						video_ready = true;
					} else {
						/*If we are too slow, reduce the pp level.*/
						pp_inc = pp_level > 0 ? -1 : 0;
					}
				}
			} else { /* we need more data; break out to suck in another page */
				video_done = theora_eos;
				break;
			}
		}

		if (!video_ready || !audio_ready) {
			int ret = buffer_data();
			if (ret > 0) {
				while (ogg_sync_pageout(&oy, &og) > 0) {
					queue_page(&og);
				}
			} else {
				vorbis_eos = true;
				theora_eos = true;
				break;
			}
		}

		double tdiff = next_frame_time - comp_time;
		/*If we have lots of extra time, increase the post-processing level.*/
		if (tdiff > ti.fps_denominator * 0.25 / ti.fps_numerator) {
			pp_inc = pp_level < pp_level_max ? 1 : 0;
		} else if (tdiff < ti.fps_denominator * 0.05 / ti.fps_numerator) {
			pp_inc = pp_level > 0 ? -1 : 0;
		}
	}

	if (!video_ready && video_done && audio_done) {
		stop();
		return;
	}

	// Wait for the last frame to end before rendering the next one.
	if (video_ready && comp_time >= current_frame_time) {
		if (!dup_frame) {
			th_ycbcr_buffer yuv;
			th_decode_ycbcr_out(td, yuv);
			video_write(yuv);
		}
		dup_frame = false;
		video_ready = false;
		current_frame_time = next_frame_time;
	}
}

void VideoStreamPlaybackTheora::play() {
	if (!playing) {
		time = 0;
	} else {
		stop();
	}

	playing = true;
	delay_compensation = GLOBAL_GET("audio/video/video_delay_compensation_ms");
	delay_compensation /= 1000.0;
}

void VideoStreamPlaybackTheora::stop() {
	if (playing) {
		clear();
		set_file(file_name); //reset
	}
	playing = false;
	time = 0;
}

bool VideoStreamPlaybackTheora::is_playing() const {
	return playing;
}

void VideoStreamPlaybackTheora::set_paused(bool p_paused) {
	paused = p_paused;
}

bool VideoStreamPlaybackTheora::is_paused() const {
	return paused;
}

double VideoStreamPlaybackTheora::get_length() const {
	return 0;
}

double VideoStreamPlaybackTheora::get_playback_position() const {
	return get_time();
}

void VideoStreamPlaybackTheora::seek(double p_time) {
	WARN_PRINT_ONCE("Seeking in Theora videos is not implemented yet (it's only supported for GDExtension-provided video streams).");
}

int VideoStreamPlaybackTheora::get_channels() const {
	return vi.channels;
}

void VideoStreamPlaybackTheora::set_audio_track(int p_idx) {
	audio_track = p_idx;
}

int VideoStreamPlaybackTheora::get_mix_rate() const {
	return vi.rate;
}

VideoStreamPlaybackTheora::VideoStreamPlaybackTheora() {
	texture.instantiate();
}

VideoStreamPlaybackTheora::~VideoStreamPlaybackTheora() {
	clear();
}

void VideoStreamTheora::_bind_methods() {}

Ref<Resource> ResourceFormatLoaderTheora::load(const String &p_path, const String &p_original_path, Error *r_error, bool p_use_sub_threads, float *r_progress, CacheMode p_cache_mode) {
	Ref<FileAccess> f = FileAccess::open(p_path, FileAccess::READ);
	if (f.is_null()) {
		if (r_error) {
			*r_error = ERR_CANT_OPEN;
		}
		return Ref<Resource>();
	}

	VideoStreamTheora *stream = memnew(VideoStreamTheora);
	stream->set_file(p_path);

	Ref<VideoStreamTheora> ogv_stream = Ref<VideoStreamTheora>(stream);

	if (r_error) {
		*r_error = OK;
	}

	return ogv_stream;
}

void ResourceFormatLoaderTheora::get_recognized_extensions(List<String> *p_extensions) const {
	p_extensions->push_back("ogv");
}

bool ResourceFormatLoaderTheora::handles_type(const String &p_type) const {
	return ClassDB::is_parent_class(p_type, "VideoStream");
}

String ResourceFormatLoaderTheora::get_resource_type(const String &p_path) const {
	String el = p_path.get_extension().to_lower();
	if (el == "ogv") {
		return "VideoStreamTheora";
	}
	return "";
}