curioustorvald/tsvm
1
0
Fork 0
mirror of https://github.com/curioustorvald/tsvm.git synced 2026-03-07 19:51:51 +09:00
Code Issues Packages Projects Releases Wiki Activity

TAV: timecode packets

Browse Source
This commit is contained in:
minjaesong
2025-10-14 00:27:26 +09:00
parent e705d274de
commit 94749a3ad6
2 changed files with 95 additions and 17 deletions
Download Patch File Download Diff File Expand all files Collapse all files

35
video_encoder/encoder_tav.c
View File

@@ -38,9 +38,10 @@
// Video packet types
#define TAV_PACKET_IFRAME 0x10 // Intra frame (keyframe)
#define TAV_PACKET_PFRAME 0x11 // Predicted frame
#define TAV_PACKET_PFRAME 0x11 // Predicted frame
#define TAV_PACKET_AUDIO_MP2 0x20 // MP2 audio
#define TAV_PACKET_SUBTITLE 0x30 // Subtitle packet
#define TAV_PACKET_TIMECODE 0xFD // Timecode packet
#define TAV_PACKET_SYNC_NTSC 0xFE // NTSC Sync packet
#define TAV_PACKET_SYNC 0xFF // Sync packet
@@ -607,6 +608,7 @@ static int calculate_max_decomp_levels(int width, int height);
static int start_audio_conversion(tav_encoder_t *enc);
static int get_mp2_packet_size(uint8_t *header);
static int mp2_packet_size_to_rate_index(int packet_size, int is_mono);
static void write_timecode_packet(FILE *output, int frame_num, int fps, int is_ntsc_framerate);
static int process_audio(tav_encoder_t *enc, int frame_num, FILE *output);
static subtitle_entry_t* parse_subtitle_file(const char *filename, int fps);
static subtitle_entry_t* parse_srt_file(const char *filename, int fps);
@@ -3285,6 +3287,29 @@ static int write_subtitle_packet(FILE *output, uint32_t index, uint8_t opcode, c
return 1 + 4 + packet_size; // Total bytes written
}
// Write timecode packet for current frame
// Timecode is the time since stream start in nanoseconds
static void write_timecode_packet(FILE *output, int frame_num, int fps, int is_ntsc_framerate) {
uint8_t packet_type = TAV_PACKET_TIMECODE;
fwrite(&packet_type, 1, 1, output);
// Calculate timecode in nanoseconds
// For NTSC (29.97 fps): time = frame_num * 1001000000 / 30000
// For other framerates: time = frame_num * 1000000000 / fps
uint64_t timecode_ns;
if (is_ntsc_framerate) {
// NTSC uses 30000/1001 fps (29.97...)
// To avoid floating point: time_ns = frame_num * 1001000000 / 30000
timecode_ns = ((uint64_t)frame_num * 1001000000ULL) / 30000ULL;
} else {
// Standard framerate
timecode_ns = ((uint64_t)frame_num * 1000000000ULL) / (uint64_t)fps;
}
// Write timecode as little-endian uint64
fwrite(&timecode_ns, sizeof(uint64_t), 1, output);
}
// Process audio for current frame (copied and adapted from TEV)
static int process_audio(tav_encoder_t *enc, int frame_num, FILE *output) {
if (!enc->has_audio || !enc->mp2_file || enc->audio_remaining <= 0) {
@@ -3991,6 +4016,9 @@ int main(int argc, char *argv[]) {
KEYFRAME_INTERVAL = CLAMP(enc->output_fps >> 4, 2, 4); // refresh often because deltas in DWT are more visible than DCT
// how in the world GOP of 2 produces smallest file??? I refuse to believe it but that's the test result.
// Write timecode packet for frame 0 (before the first frame)
write_timecode_packet(enc->output_fp, 0, enc->output_fps, enc->is_ntsc_framerate);
while (continue_encoding) {
// Check encode limit if specified
if (enc->encode_limit > 0 && frame_count >= enc->encode_limit) {
@@ -3999,6 +4027,11 @@ int main(int argc, char *argv[]) {
break;
}
// Write timecode packet for frames 1+ (right after sync packet from previous frame)
if (frame_count > 0) {
write_timecode_packet(enc->output_fp, frame_count, enc->output_fps, enc->is_ntsc_framerate);
}
if (enc->test_mode) {
// Test mode has a fixed frame count
if (frame_count >= enc->total_frames) {