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tav: support for fractional framerate

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minjaesong
2025-12-25 18:26:56 +09:00
parent 4afe3816c7
commit 54b61fb436
5 changed files with 167 additions and 21 deletions
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28
video_encoder/src/encoder_tav.c
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@@ -630,8 +630,19 @@ static int write_tav_header(FILE *fp, const tav_encoder_params_t *params,
uint16_t height = (actual_height > 65535) ? 0 : (uint16_t)actual_height;
fwrite(&height, sizeof(uint16_t), 1, fp);
// FPS (uint8_t, 1 byte) - 0 for still images, fps_num for video
uint8_t fps = is_still_image ? 0 : (uint8_t)params->fps_num;
// FPS (uint8_t, 1 byte)
// - 0x00 for still images
// - 0xFF if fps_num > 254 or fps_den is not 1 or 1001 (use XFPS extended header)
// - otherwise fps_num
uint8_t fps;
if (is_still_image) {
fps = 0;
} else if (params->fps_num > 254 ||
(params->fps_den != 1 && params->fps_den != 1001)) {
fps = 0xFF; // Extended framerate in XFPS
} else {
fps = (uint8_t)params->fps_num;
}
fputc(fps, fp);
// Total frames (uint32_t, 4 bytes)
@@ -699,11 +710,14 @@ static long write_extended_header(cli_context_t *cli, int width, int height) {
uint8_t packet_type = TAV_PACKET_EXTENDED_HDR;
if (fwrite(&packet_type, 1, 1, fp) != 1) return -1;
// Count key-value pairs: BGNT, ENDT, CDAT, VNDR, optionally FMPG, and optionally XDIM
// Count key-value pairs: BGNT, ENDT, CDAT, VNDR, optionally FMPG, XDIM, XFPS
int has_xdim = (width > 65535 || height > 65535);
int has_xfps = (cli->enc_params.fps_num > 254 ||
(cli->enc_params.fps_den != 1 && cli->enc_params.fps_den != 1001));
uint16_t num_pairs = 4; // BGNT, ENDT, CDAT, VNDR
if (cli->ffmpeg_version) num_pairs++; // FMPG
if (has_xdim) num_pairs++; // XDIM
if (has_xfps) num_pairs++; // XFPS
if (fwrite(&num_pairs, sizeof(uint16_t), 1, fp) != 1) return -1;
// Helper macros for writing key-value pairs
@@ -751,6 +765,14 @@ static long write_extended_header(cli_context_t *cli, int width, int height) {
WRITE_KV_BYTES("XDIM", xdim_str, strlen(xdim_str));
}
// XFPS: Extended framerate (if fps_num > 254 or fps_den is not 1 or 1001)
if (has_xfps) {
char xfps_str[32];
snprintf(xfps_str, sizeof(xfps_str), "%d/%d",
cli->enc_params.fps_num, cli->enc_params.fps_den);
WRITE_KV_BYTES("XFPS", xfps_str, strlen(xfps_str));
}
#undef WRITE_KV_UINT64
#undef WRITE_KV_BYTES