shithub: mcfs

ref: b4251305f9b6bce681362c77600c43190aa42e34
dir: mcfs/ivf.c

#include <u.h>
#include <libc.h>
#include <bio.h>
#include "common.h"

enum {
	Timedenum = 1000ULL,
};

int
ivfpacket(Biobuf *out, Packetctx *ctx, Packet *p, int np, uvlong ts)
{
	u8int d[0x20];
	uvlong dur;
	int n, len;

	dur = ctx->duration / 1000000ULL;
	ts = ts / 1000000ULL;

	for(; np > 0; np--, p++){
		if(ctx->frid == 0){
			memmove(d, "DKIF", 4);
			d[4] = 0;
			d[5] = 0;
			d[6] = 0x20;
			d[7] = 0;
			if(ctx->fmt == FmtAv01)
				memmove(d+8, "AV01", 4);
			else if(ctx->fmt == FmtAvc1)
				memmove(d+8, "AVC1", 4);
			else if(ctx->fmt == FmtVp08)
				memmove(d+8, "VP80", 4);
			else if(ctx->fmt == FmtVp09)
				memmove(d+8, "VP90", 4);
			else{
				werrstr("unsupported video format %T", ctx->fmt);
				goto err;
			}
			d[12] = ctx->video.width;
			d[13] = ctx->video.width >> 8;
			d[14] = ctx->video.height;
			d[15] = ctx->video.height >> 8;
			/* timebase denum */
			d[16] = Timedenum;
			d[17] = Timedenum >> 8;
			d[18] = Timedenum >> 16;
			d[19] = Timedenum >> 24;
			/* timebase num */
			d[20] = 1;
			d[21] = 0;
			d[22] = 0;
			d[23] = 0;
			/* FIXME is it a "number of frames" or "total duration?" */
			d[24] = dur;
			d[25] = dur >> 8;
			d[26] = dur >> 16;
			d[27] = dur >> 24;
			d[28] = dur >> 32; /* FIXME is it 64 bits? */
			d[29] = dur >> 40;
			d[30] = dur >> 48;
			d[31] = dur >> 56;

			if(Bwrite(out, d, 0x20) != 0x20)
				goto err;
		}

		d[0] = p[0].sz;
		d[1] = p[0].sz >> 8;
		d[2] = p[0].sz >> 16;
		d[3] = p[0].sz >> 24;
		d[4] = ts;
		d[5] = ts >> 8;
		d[6] = ts >> 16;
		d[7] = ts >> 24;
		d[8] = ts >> 32;
		d[9] = ts >> 40;
		d[10] = ts >> 48;
		d[11] = ts >> 56;
		if(Bwrite(out, d, 12) != 12)
			goto err;
		if(ctx->fmt == FmtAvc1){
			for(n = 0; n < p[0].sz; n += len+4){
				len = p[0].data[n+0]<<24 | p[0].data[n+1]<<16 | p[0].data[n+2]<<8 | p[0].data[n+3];
				p[0].data[n+0] = 0;
				p[0].data[n+1] = 0;
				p[0].data[n+2] = 0;
				p[0].data[n+3] = 1;
			}
		}
		if(Bwrite(out, p[0].data, p[0].sz) != p[0].sz)
			goto err;
		ctx->frid++;
	}

	return 0;
err:
	werrstr("ivfpacket: %r");
	return -1;
}