74 lines
1.9 KiB
C
74 lines
1.9 KiB
C
#include <am.h>
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#include <stdio.h>
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#include <klib-macros.h>
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#define FPS 30
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#define CHAR_WHITE '.'
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#define CHAR_BLACK 'X'
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typedef struct {
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uint8_t pixel[VIDEO_ROW * VIDEO_COL / 8];
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} frame_t;
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static void sleep_until(uint64_t next) {
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while (io_read(AM_TIMER_UPTIME).us < next) ;
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}
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static uint8_t getbit(uint8_t *p, int idx) {
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int byte_idx = idx / 8;
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int bit_idx = idx % 8;
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bit_idx = 7 - bit_idx;
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uint8_t byte = p[byte_idx];
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uint8_t bit = (byte >> bit_idx) & 1;
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return bit;
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}
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int main() {
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extern uint8_t video_payload, video_payload_end;
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extern uint8_t audio_payload, audio_payload_end;
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int audio_len = 0, audio_left = 0;
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Area sbuf;
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ioe_init();
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frame_t *f = (void *)&video_payload;
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frame_t *fend = (void *)&video_payload_end;
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printf("\033[H\033[J"); // screan_clear
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bool has_audio = io_read(AM_AUDIO_CONFIG).present;
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if (has_audio) {
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io_write(AM_AUDIO_CTRL, AUDIO_FREQ, AUDIO_CHANNEL, 1024);
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audio_left = audio_len = &audio_payload_end - &audio_payload;
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sbuf.start = &audio_payload;
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}
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uint64_t now = io_read(AM_TIMER_UPTIME).us;
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for (; f < fend; f ++) {
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printf("\033[0;0H"); // reset cursor
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for (int y = 0; y < VIDEO_ROW; y++) {
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for (int x = 0; x < VIDEO_COL; x++) {
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uint8_t p = getbit(f->pixel, y * VIDEO_COL + x);
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putch(p ? CHAR_BLACK : CHAR_WHITE);
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}
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putch('\n');
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}
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if (has_audio) {
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int should_play = (AUDIO_FREQ / FPS) * sizeof(int16_t);
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if (should_play > audio_left) should_play = audio_left;
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while (should_play > 0) {
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int len = (should_play > 4096 ? 4096 : should_play);
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sbuf.end = sbuf.start + len;
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io_write(AM_AUDIO_PLAY, sbuf);
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sbuf.start += len;
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should_play -= len;
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}
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audio_left -= should_play;
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}
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uint64_t next = now + (1000 * 1000 / FPS);
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sleep_until(next);
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now = next;
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}
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return 0;
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}
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