1/* Copyright (c) 2013-2015 Jeffrey Pfau
 2 *
 3 * This Source Code Form is subject to the terms of the Mozilla Public
 4 * License, v. 2.0. If a copy of the MPL was not distributed with this
 5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 6#include "imagemagick-gif-encoder.h"
 7
 8#include "gba/video.h"
 9
10static void _magickPostVideoFrame(struct GBAAVStream*, struct GBAVideoRenderer* renderer);
11static void _magickPostAudioFrame(struct GBAAVStream*, int16_t left, int16_t right);
12
13void ImageMagickGIFEncoderInit(struct ImageMagickGIFEncoder* encoder) {
14	encoder->wand = 0;
15
16	encoder->d.postVideoFrame = _magickPostVideoFrame;
17	encoder->d.postAudioFrame = _magickPostAudioFrame;
18	encoder->d.postAudioBuffer = 0;
19
20	encoder->frameskip = 2;
21}
22
23bool ImageMagickGIFEncoderOpen(struct ImageMagickGIFEncoder* encoder, const char* outfile) {
24	MagickWandGenesis();
25	encoder->wand = NewMagickWand();
26	encoder->outfile = strdup(outfile);
27	encoder->frame = malloc(VIDEO_HORIZONTAL_PIXELS * VIDEO_VERTICAL_PIXELS * 4);
28	encoder->currentFrame = 0;
29	return true;
30}
31void ImageMagickGIFEncoderClose(struct ImageMagickGIFEncoder* encoder) {
32	if (!encoder->wand) {
33		return;
34	}
35	MagickWriteImages(encoder->wand, encoder->outfile, MagickTrue);
36	free(encoder->outfile);
37	free(encoder->frame);
38	DestroyMagickWand(encoder->wand);
39	encoder->wand = 0;
40	MagickWandTerminus();
41}
42
43bool ImageMagickGIFEncoderIsOpen(struct ImageMagickGIFEncoder* encoder) {
44	return !!encoder->wand;
45}
46
47static void _magickPostVideoFrame(struct GBAAVStream* stream, struct GBAVideoRenderer* renderer) {
48	struct ImageMagickGIFEncoder* encoder = (struct ImageMagickGIFEncoder*) stream;
49
50	if (encoder->currentFrame % (encoder->frameskip + 1)) {
51		++encoder->currentFrame;
52		return;
53	}
54
55	uint8_t* pixels;
56	unsigned stride;
57	renderer->getPixels(renderer, &stride, (void**) &pixels);
58	size_t row;
59	for (row = 0; row < VIDEO_VERTICAL_PIXELS; ++row) {
60		memcpy(&encoder->frame[row * VIDEO_HORIZONTAL_PIXELS], &pixels[row * 4 *stride], VIDEO_HORIZONTAL_PIXELS * 4);
61	}
62
63	MagickConstituteImage(encoder->wand, VIDEO_HORIZONTAL_PIXELS, VIDEO_VERTICAL_PIXELS, "RGBP", CharPixel, encoder->frame);
64	uint64_t ts = encoder->currentFrame;
65	uint64_t nts = encoder->currentFrame + encoder->frameskip + 1;
66	ts *= VIDEO_TOTAL_LENGTH * 100;
67	nts *= VIDEO_TOTAL_LENGTH * 100;
68	ts /= GBA_ARM7TDMI_FREQUENCY;
69	nts /= GBA_ARM7TDMI_FREQUENCY;
70	MagickSetImageDelay(encoder->wand, nts - ts);
71	++encoder->currentFrame;
72}
73
74static void _magickPostAudioFrame(struct GBAAVStream* stream, int16_t left, int16_t right) {
75	UNUSED(stream);
76	UNUSED(left);
77	UNUSED(right);
78	// This is a video-only format...
79}