#!/bin/sh


# Build the .wasm Module first

# Since we're compiling a side module here, so that we can load it without the
# runtime cruft, we have to explicitly compile in support for malloc and
# friends.
# Note memcpy, memmove and memset are explicitly exported, otherwise they will
# be eliminated by the SIDE_MODULE=2 setting - not sure why that happens.
emcc \
	src/wasm/mpeg1.c \
	src/wasm/mp2.c \
	src/wasm/buffer.c \
	$EMSCRIPTEN/system/lib/emmalloc.cpp \
	$EMSCRIPTEN/system/lib/libc/musl/src/string/memcpy.c \
	$EMSCRIPTEN/system/lib/libc/musl/src/string/memmove.c \
	$EMSCRIPTEN/system/lib/libc/musl/src/string/memset.c \
	-s WASM=1 \
	-s SIDE_MODULE=2 \
	-s TOTAL_STACK=5242880\
	-s USE_PTHREADS=0 \
	-s LEGALIZE_JS_FFI=0\
	-s NO_FILESYSTEM=1 \
	-s DEFAULT_LIBRARY_FUNCS_TO_INCLUDE="[]" \
	-s "EXPORTED_FUNCTIONS=[
		'_memcpy',
		'_memmove',
		'_memset',
		'_mpeg1_decoder_create',
		'_mpeg1_decoder_destroy',
		'_mpeg1_decoder_get_write_ptr',
		'_mpeg1_decoder_get_index',
		'_mpeg1_decoder_set_index',
		'_mpeg1_decoder_did_write',
		'_mpeg1_decoder_has_sequence_header',
		'_mpeg1_decoder_get_frame_rate',
		'_mpeg1_decoder_get_coded_size',
		'_mpeg1_decoder_get_width',
		'_mpeg1_decoder_get_height',
		'_mpeg1_decoder_get_y_ptr',
		'_mpeg1_decoder_get_cr_ptr',
		'_mpeg1_decoder_get_cb_ptr',
		'_mpeg1_decoder_decode',
		'_mp2_decoder_create',
		'_mp2_decoder_destroy',
		'_mp2_decoder_get_write_ptr',
		'_mp2_decoder_get_index',
		'_mp2_decoder_set_index',
		'_mp2_decoder_did_write',
		'_mp2_decoder_get_left_channel_ptr',
		'_mp2_decoder_get_right_channel_ptr',
		'_mp2_decoder_get_sample_rate',
		'_mp2_decoder_decode']" \
	-O3 \
	-o jsmpeg.wasm


# Concat all .js sources
cat \
	src/jsmpeg.js \
	src/video-element.js \
	src/player.js \
	src/buffer.js \
	src/ajax.js \
	src/fetch.js \
	src/ajax-progressive.js \
	src/websocket.js \
	src/ts.js \
	src/decoder.js \
	src/mpeg1.js \
	src/mpeg1-wasm.js \
	src/mp2.js \
	src/mp2-wasm.js \
	src/webgl.js \
	src/canvas2d.js \
	src/webaudio.js \
	src/wasm-module.js \
	> jsmpeg.js

# Append the .wasm module to the .js source as base64 string
echo "JSMpeg.WASM_BINARY_INLINED='$(base64 -w 0 jsmpeg.wasm)';" \
	>> jsmpeg.js


# Minify
uglifyjs jsmpeg.js -o jsmpeg.min.js

# Cleanup
rm jsmpeg.js
rm jsmpeg.wasm