diff options
Diffstat (limited to 'examples/device/video_capture/src/main.c')
| -rw-r--r-- | examples/device/video_capture/src/main.c | 101 |
1 files changed, 48 insertions, 53 deletions
diff --git a/examples/device/video_capture/src/main.c b/examples/device/video_capture/src/main.c index 759c06057..2c6d42829 100644 --- a/examples/device/video_capture/src/main.c +++ b/examples/device/video_capture/src/main.c @@ -40,7 +40,7 @@ * - 1000 ms : device mounted * - 2500 ms : device is suspended */ -enum { +enum { BLINK_NOT_MOUNTED = 250, BLINK_MOUNTED = 1000, BLINK_SUSPENDED = 2500, @@ -52,8 +52,7 @@ void led_blinking_task(void); void video_task(void); /*------------- MAIN -------------*/ -int main(void) -{ +int main(void) { board_init(); // init device stack on configured roothub port @@ -63,8 +62,7 @@ int main(void) board_init_after_tusb(); } - while (1) - { + while (1) { tud_task(); // tinyusb device task led_blinking_task(); @@ -77,33 +75,28 @@ int main(void) //--------------------------------------------------------------------+ // Invoked when device is mounted -void tud_mount_cb(void) -{ +void tud_mount_cb(void) { blink_interval_ms = BLINK_MOUNTED; } // Invoked when device is unmounted -void tud_umount_cb(void) -{ +void tud_umount_cb(void) { blink_interval_ms = BLINK_NOT_MOUNTED; } // Invoked when usb bus is suspended // remote_wakeup_en : if host allow us to perform remote wakeup // Within 7ms, device must draw an average of current less than 2.5 mA from bus -void tud_suspend_cb(bool remote_wakeup_en) -{ +void tud_suspend_cb(bool remote_wakeup_en) { (void) remote_wakeup_en; blink_interval_ms = BLINK_SUSPENDED; } // Invoked when usb bus is resumed -void tud_resume_cb(void) -{ +void tud_resume_cb(void) { blink_interval_ms = tud_mounted() ? BLINK_MOUNTED : BLINK_NOT_MOUNTED; } - //--------------------------------------------------------------------+ // USB Video //--------------------------------------------------------------------+ @@ -111,11 +104,12 @@ static unsigned frame_num = 0; static unsigned tx_busy = 0; static unsigned interval_ms = 1000 / FRAME_RATE; -/* YUY2 frame buffer */ #ifdef CFG_EXAMPLE_VIDEO_READONLY +// For mcus that does not have enough SRAM for frame buffer, we use fixed frame data. +// To further reduce the size, we use MJPEG format instead of YUY2. #include "images.h" -# if !defined(CFG_EXAMPLE_VIDEO_DISABLE_MJPEG) +#if !defined(CFG_EXAMPLE_VIDEO_DISABLE_MJPEG) static struct { uint32_t size; uint8_t const *buffer; @@ -129,29 +123,30 @@ static struct { {color_bar_6_jpg_len, color_bar_6_jpg}, {color_bar_7_jpg_len, color_bar_7_jpg}, }; -# endif +#endif #else + +// YUY2 frame buffer static uint8_t frame_buffer[FRAME_WIDTH * FRAME_HEIGHT * 16 / 8]; -static void fill_color_bar(uint8_t *buffer, unsigned start_position) -{ - /* EBU color bars - * See also https://stackoverflow.com/questions/6939422 */ + +static void fill_color_bar(uint8_t* buffer, unsigned start_position) { + /* EBU color bars: https://stackoverflow.com/questions/6939422 */ static uint8_t const bar_color[8][4] = { - /* Y, U, Y, V */ - { 235, 128, 235, 128}, /* 100% White */ - { 219, 16, 219, 138}, /* Yellow */ - { 188, 154, 188, 16}, /* Cyan */ - { 173, 42, 173, 26}, /* Green */ - { 78, 214, 78, 230}, /* Magenta */ - { 63, 102, 63, 240}, /* Red */ - { 32, 240, 32, 118}, /* Blue */ - { 16, 128, 16, 128}, /* Black */ + /* Y, U, Y, V */ + { 235, 128, 235, 128}, /* 100% White */ + { 219, 16, 219, 138}, /* Yellow */ + { 188, 154, 188, 16}, /* Cyan */ + { 173, 42, 173, 26}, /* Green */ + { 78, 214, 78, 230}, /* Magenta */ + { 63, 102, 63, 240}, /* Red */ + { 32, 240, 32, 118}, /* Blue */ + { 16, 128, 16, 128}, /* Black */ }; - uint8_t *p; + uint8_t* p; /* Generate the 1st line */ - uint8_t *end = &buffer[FRAME_WIDTH * 2]; + uint8_t* end = &buffer[FRAME_WIDTH * 2]; unsigned idx = (FRAME_WIDTH / 2 - 1) - (start_position % (FRAME_WIDTH / 2)); p = &buffer[idx * 4]; for (unsigned i = 0; i < 8; ++i) { @@ -163,6 +158,7 @@ static void fill_color_bar(uint8_t *buffer, unsigned start_position) } } } + /* Duplicate the 1st line to the others */ p = &buffer[FRAME_WIDTH * 2]; for (unsigned i = 1; i < FRAME_HEIGHT; ++i) { @@ -170,16 +166,16 @@ static void fill_color_bar(uint8_t *buffer, unsigned start_position) p += FRAME_WIDTH * 2; } } + #endif -void video_task(void) -{ +void video_task(void) { static unsigned start_ms = 0; static unsigned already_sent = 0; if (!tud_video_n_streaming(0, 0)) { - already_sent = 0; - frame_num = 0; + already_sent = 0; + frame_num = 0; return; } @@ -188,15 +184,15 @@ void video_task(void) tx_busy = 1; start_ms = board_millis(); #ifdef CFG_EXAMPLE_VIDEO_READONLY -# if defined(CFG_EXAMPLE_VIDEO_DISABLE_MJPEG) + #if defined(CFG_EXAMPLE_VIDEO_DISABLE_MJPEG) tud_video_n_frame_xfer(0, 0, (void*)(uintptr_t)&frame_buffer[(frame_num % (FRAME_WIDTH / 2)) * 4], FRAME_WIDTH * FRAME_HEIGHT * 16/8); -# else + #else tud_video_n_frame_xfer(0, 0, (void*)(uintptr_t)frames[frame_num % 8].buffer, frames[frame_num % 8].size); -# endif + #endif #else fill_color_bar(frame_buffer, frame_num); - tud_video_n_frame_xfer(0, 0, (void*)frame_buffer, FRAME_WIDTH * FRAME_HEIGHT * 16/8); + tud_video_n_frame_xfer(0, 0, (void*) frame_buffer, FRAME_WIDTH * FRAME_HEIGHT * 16 / 8); #endif } @@ -207,30 +203,30 @@ void video_task(void) tx_busy = 1; #ifdef CFG_EXAMPLE_VIDEO_READONLY -# if defined(CFG_EXAMPLE_VIDEO_DISABLE_MJPEG) + #if defined(CFG_EXAMPLE_VIDEO_DISABLE_MJPEG) tud_video_n_frame_xfer(0, 0, (void*)(uintptr_t)&frame_buffer[(frame_num % (FRAME_WIDTH / 2)) * 4], FRAME_WIDTH * FRAME_HEIGHT * 16/8); -# else + #else tud_video_n_frame_xfer(0, 0, (void*)(uintptr_t)frames[frame_num % 8].buffer, frames[frame_num % 8].size); -# endif + #endif #else fill_color_bar(frame_buffer, frame_num); - tud_video_n_frame_xfer(0, 0, (void*)frame_buffer, FRAME_WIDTH * FRAME_HEIGHT * 16/8); + tud_video_n_frame_xfer(0, 0, (void*) frame_buffer, FRAME_WIDTH * FRAME_HEIGHT * 16 / 8); #endif } -void tud_video_frame_xfer_complete_cb(uint_fast8_t ctl_idx, uint_fast8_t stm_idx) -{ - (void)ctl_idx; (void)stm_idx; +void tud_video_frame_xfer_complete_cb(uint_fast8_t ctl_idx, uint_fast8_t stm_idx) { + (void) ctl_idx; + (void) stm_idx; tx_busy = 0; /* flip buffer */ ++frame_num; } int tud_video_commit_cb(uint_fast8_t ctl_idx, uint_fast8_t stm_idx, - video_probe_and_commit_control_t const *parameters) -{ - (void)ctl_idx; (void)stm_idx; + video_probe_and_commit_control_t const* parameters) { + (void) ctl_idx; + (void) stm_idx; /* convert unit to ms from 100 ns */ interval_ms = parameters->dwFrameInterval / 10000; return VIDEO_ERROR_NONE; @@ -239,13 +235,12 @@ int tud_video_commit_cb(uint_fast8_t ctl_idx, uint_fast8_t stm_idx, //--------------------------------------------------------------------+ // BLINKING TASK //--------------------------------------------------------------------+ -void led_blinking_task(void) -{ +void led_blinking_task(void) { static uint32_t start_ms = 0; static bool led_state = false; // Blink every interval ms - if ( board_millis() - start_ms < blink_interval_ms) return; // not enough time + if (board_millis() - start_ms < blink_interval_ms) return; // not enough time start_ms += blink_interval_ms; board_led_write(led_state); |