static int dnxhd_write_header(AVCodecContext *avctx, uint8_t *buf) { DNXHDEncContext *ctx = avctx->priv_data; const uint8_t header_prefix[5] = { 0x00,0x00,0x02,0x80,0x01 }; memcpy(buf, header_prefix, 5); buf[5] = ctx->interlaced ? ctx->cur_field+2 : 0x01; buf[6] = 0x80; // crc flag off buf[7] = 0xa0; // reserved AV_WB16(buf + 0x18, avctx->height); // ALPF AV_WB16(buf + 0x1a, avctx->width); // SPL AV_WB16(buf + 0x1d, avctx->height); // NAL buf[0x21] = 0x38; // FIXME 8 bit per comp buf[0x22] = 0x88 + (ctx->frame.interlaced_frame<<2); AV_WB32(buf + 0x28, ctx->cid); // CID buf[0x2c] = ctx->interlaced ? 0 : 0x80; buf[0x5f] = 0x01; // UDL buf[0x167] = 0x02; // reserved AV_WB16(buf + 0x16a, ctx->m.mb_height * 4 + 4); // MSIPS buf[0x16d] = ctx->m.mb_height; // Ns buf[0x16f] = 0x10; // reserved ctx->msip = buf + 0x170; return 0; }